Calculators

The Amortization Calculator helps you estimate monthly payments and generate customized amortization schedules based on your loan amount, term, and interest rate.

Estimate your monthly auto lease payments, total depreciation, and rent charges with our modern auto lease calculator.

Estimate your monthly car payments, total interest, and the true cost of your next vehicle purchase with our comprehensive auto loan calculator.

Calculate your monthly boat payment, total interest, and full amortization schedule — including down payment and trade-in value.

Estimate your business loan monthly payment, net proceeds after origination fees, and total cost over the life of the loan.

Calculate your Canadian mortgage payment using legally-mandated semi-annual compounding, plus the remaining balance you'll actually owe at renewal time.

Compare auto manufacturer incentives to determine if a cash back rebate or a low promotional interest rate offers better long-term savings on your car purchase.

Find out how long it will take to pay off your credit card balance, how much interest you'll pay, and how much the minimum-payment trap really costs.

Compare paying off several existing debts separately against rolling them into a single consolidation loan, and see the real savings (or cost) in interest and monthly payment.

Simulate paying off multiple debts at once with the snowball (smallest balance first) or avalanche (highest interest first) strategy, and see exactly when you'll be debt-free.

The Debt-to-Income (DTI) Ratio Calculator computes your front-end and back-end debt percentages based on your gross income.

Use this down payment calculator to find your affordable home price from available cash, calculate exactly how much cash you need for a given home price, or determine your down payment percentage.

The FHA Loan Calculator helps estimate your monthly payment and total costs associated with FHA mortgages.

Use this HELOC calculator to estimate your draw period and repayment period monthly payments, total interest paid, and see a full amortization schedule for your Home Equity Line of Credit.

The Home Equity Loan Calculator helps you estimate monthly payments based on loan values, and discover your potential maximum borrowable home equity.

Estimate an affordable purchase amount for a house based on either household income-to-debt estimates or fixed monthly budgets.

Calculate your monthly loan payment, total interest, and full amortization schedule for any fixed-rate installment loan.

The Mortgage Calculator helps estimate the monthly payment due along with other financial costs associated with mortgages.

Evaluate how adding extra payments or bi-weekly payments can save on interest and shorten your mortgage term.

Estimate your personal loan monthly payment, net proceeds after origination fees, and total interest — great for debt consolidation planning.

Compare your existing loan against a refinanced loan to evaluate monthly payment reductions or lifetime savings.

Decide whether it makes more financial sense to rent or buy a home by comparing costs, appreciation, and investment returns over time.

The Rental Property Calculator evaluates the financial viability, cash flow, and potential return on investment (ROI) of real estate rentals over time.

Get a ballpark estimate of how much cash a reverse mortgage (HECM-style) could make available from your home equity, based on your age, home value, and an assumed interest rate.

Estimate your student loan monthly payment, total interest, and payoff timeline — including grace period interest capitalization.

Estimate your UK mortgage payment (repayment or interest-only), Stamp Duty Land Tax (SDLT), and total upfront cash needed for a first-time buyer or home mover.

The VA Mortgage Calculator helps estimate the specialized costs associated with a Veterans Affairs loan.

Project your 401(k) balance at retirement, including your employee contributions, employer match, and optional annual raises.

Project the future value of an annuity's accumulation phase from an optional lump sum, periodic contributions, and an annual growth rate.

Calculate the fixed monthly payout an insurance annuity can generate from a starting balance over a guaranteed fixed term.

Calculate the true cost of borrowing with the APR Calculator. Understand hidden fees and interest expenses for both general loans and mortgages.

Calculate the arithmetic mean and the geometric mean (annualized/CAGR) return for a series of up to five periodic percentage returns, and see how much volatility drag matters.

Bond present value calculator: solve for price, yield, coupon, or maturity, plus clean/dirty price and accrued interest.

Estimate the federal tax owed on an investment or asset sale, based on your holding period, filing status, and taxable income -- covers both short-term and long-term capital gains.

Calculate the final balance and total interest earned on a Certificate of Deposit (CD). Supports all compounding frequencies and marginal tax adjustments for accurate projections.

Project the total future cost of college and calculate the monthly savings needed to close the gap between your current savings and that cost.

Calculate the estimated future value of your savings or investments with compound interest. Plan your wealth growth with our interactive financial tool.

Project the future value of investing a fixed amount on a regular schedule, and see how it compares to investing the same total as a lump sum today.

The Finance Calculator acts as a Time Value of Money (TVM) solver to calculate Future Value (FV), Periodic Payment (PMT), Interest Rate (I/Y), Number of Periods (N), or Present Value (PV).

Calculate simple and compound interest with additional contributions, tax considerations, and inflation adjustments.

Accurately determine the real interest rate on loans when only the monthly payment and total price are provided.

The Investment Calculator can help determine one of many different variables concerning investments with a fixed rate of return. Solve for End Amount, Additional Contribution, Return Rate, Starting Amount, or Investment Length.

Project your Traditional IRA balance at retirement, plus this year's tax deduction and the after-tax value of your balance at withdrawal.

Calculate the internal rate of return (IRR) for an initial investment followed by a series of periodic cash flows, plus the NPV at a comparison discount rate.

Calculate the required margin, maximum buying power, and whether your account equity is sufficient to open a leveraged trading position.

Project a mutual fund's future value net of its expense ratio and front-load or back-load sales fees, and see exactly how much those fees cost you over time.

Calculate how many years it takes to recover an initial investment from a series of periodic cash inflows, using the cumulative-cash-flow method with fractional-year interpolation.

Estimate your defined-benefit pension payout from your years of service, accrual rate, and final average salary, including any early-retirement reduction.

Simulate how long a self-managed retirement portfolio will last given your withdrawal amount, expected return, and optional inflation adjustment.

Calculate your Required Minimum Distribution (RMD) using the IRS Uniform Lifetime Table, based on your account balance and current age.

Calculate the total return on investment (ROI) and annualized ROI from a known cost and final value -- no assumed rate of return required.

Project your Roth IRA balance at retirement -- fully tax-free, since Roth contributions are made with after-tax dollars.

Estimate how many years it takes an investment to double, triple, or quadruple at a given annual return -- or find the rate you'd need to double your money in a target number of years.

Estimate the end balance and interest of your savings accounts, considering factors like tax, inflation, and periodic contributions.

Free simple interest calculator using I = Prt. Find interest earned, final balance, or solve for rate on loans and investments instantly.

Estimate your Social Security Primary Insurance Amount from your average indexed monthly earnings, and see how claiming early or late changes your benefit.

Compare your actual spending against the 50/30/20 budgeting rule (or your own custom percentages) across needs, wants, and savings, with a variance breakdown for each category.

Calculate sales commission on a flat percentage rate or a progressive tiered rate structure, plus your On-Target-Earnings total when a base salary is added.

Calculate asset depreciation using the Straight-Line, Declining Balance, or Sum-of-Years-Digits method, with a full year-by-year depreciation schedule.

Calculate the final sale price and total savings from one or two stacked percent-off discounts, or work backward from a known sale price to find the original price.

Estimate federal estate tax owed using a simplified flat top-rate approximation -- gross estate value, prior taxable gifts, and the current federal exemption.

Work backward from your target annual income, time off, business expenses, and a tax reserve to the hourly rate you actually need to charge as a freelancer.

Estimate your total federal income tax liability for the year -- taxable income, marginal rate, effective rate, and total tax owed -- using the current tax brackets and standard deduction.

Calculate how inflation changes the value of money over time -- project how much future money you'll need to match today's purchasing power, or discount a future amount back into today's dollars.

Find out whether filing Married Filing Jointly saves you money (a marriage bonus) or costs you money (a marriage penalty) compared to each spouse's tax bill as a single filer.

Calculate your net worth by adding up your assets -- cash, investments, retirement accounts, real estate -- and subtracting your liabilities.

Estimate your take-home pay per paycheck and per year, including federal income tax, Social Security, Medicare, pre-tax 401(k)/HSA contributions, and a flat state tax estimate.

Estimate the affordable monthly rental spending amount based on your income and existing debt levels.

Calculate US sales tax added at the register -- add tax to a pre-tax price, or back out the pre-tax price and tax amount from a known total.

Generate accurate weekly time reports with our easy-to-use time card calculator. Support for breaks, rounding, and overtime.

Convert time between different global time zones with our easy-to-use calculator. Understand UTC offsets, GMT, and daylight saving time.

Calculate Value Added Tax (VAT) -- add VAT to a net price to get the gross price, or back out the net price and VAT amount from a VAT-inclusive gross price.

Estimate your body fat percentage using the U.S. Army circumference-based tape-test method (AR 600-9) and compare against Army standards by age band.

Calculate your Body Mass Index (BMI) and understand your health status with our interactive tool.

Calculate your body fat percentage, body fat mass, and lean body mass using the U.S. Navy Method and BMI Method. Plan your fitness journey with our interactive tool.

Calculate your Body Surface Area (BSA) using the Mosteller and DuBois formulas from your height and weight.

Estimate your body type (ectomorph, mesomorph, or endomorph) using the wrist-circumference-to-height frame-size ratio.

Calculate your healthy weight range based on your height using the WHO healthy BMI band (18.5-25).

Free ideal weight calculator using Hamwi, Devine, Robinson & Miller formulas. Get your ideal body weight by height, age, and sex in seconds.

Calculate your lean body mass (fat-free mass) using the Boer, James, and Hume formulas from just your height, weight, and sex.

Calculate how much excess weight you're carrying above the healthy BMI ceiling, plus a realistic safe weight-loss timeline.

Calculate your waist-to-hip ratio (WHR) from two tape-measure readings and see how it compares to WHO health-risk categories for your sex.

Calculate your Basal Metabolic Rate (BMR) using the Mifflin-St Jeor, Revised Harris-Benedict, and Katch-McArdle formulas.

Free cal to joule converter. Instantly convert calorie to joule, kcal to kJ, and food Calories to kilojoules with exact 4.184 factor.

Estimate your daily calorie needs using science-backed BMR equations. Plan weight loss, maintenance, or gain with our interactive calorie calculator.

Calculate calories burned during exercise using MET (Metabolic Equivalent of Task) values for common activities.

Calculate your recommended daily carbohydrate intake in grams based on your calorie needs and the Acceptable Macronutrient Distribution Range.

Calculate your recommended daily water intake based on your weight and activity level.

Calculate your recommended daily fat intake in grams based on your calorie needs and the Acceptable Macronutrient Distribution Range.

Calculate your daily protein, carbohydrate, and fat targets in grams based on your calorie needs and macro split preference.

Calculate your recommended daily protein intake in grams based on your body weight, activity level, and goal.

Calculate your Total Daily Energy Expenditure (TDEE) using the Mifflin-St Jeor BMR equation and an activity-multiplier breakdown.

Estimate your one-rep max (1RM) from a submaximal set using the Epley and Brzycki formulas, plus a training percentage table.

Estimate pace, time, and distance for running, walking, or biking. Includes multipoint calculations, converters, and finish time predictions.

Convert a daily step count into an estimated distance walked and calories burned, based on your height and weight.

Calculate your target heart rate training zone using the Karvonen method, based on your age and resting heart rate.

Estimate your VO2 max (aerobic fitness) from your age and resting heart rate using the Uth-Sorensen-Overgaard-Pedersen non-exercise formula.

Estimate the likely conception date range from a known due date or birth date, using the reverse of Naegele's Rule.

Calculate your estimated due date from your last period, conception date, IVF transfer date, or an ultrasound scan.

Predict your ovulation day and fertile window for your next few cycles based on your last period and average cycle length.

Predict your next several menstrual period start and end dates based on your last period and average cycle length.

Calculate your due date, current gestational age, and trimester milestones from your last menstrual period.

Calculate your recommended total pregnancy weight gain range and weekly gain rate based on your pre-pregnancy BMI, using IOM guidelines.

Convert between A1C percentage and estimated average glucose (eAG), in mg/dL or mmol/L, using the ADAG study formula -- works in both directions.

Estimate your blood alcohol concentration (BAC) using the Widmark formula. Informational only — not a breathalyzer substitute.

Enter a systolic and diastolic reading to see which American Heart Association blood pressure category it falls into -- Normal, Elevated, Hypertension Stage 1 or 2, or Hypertensive Crisis.

Estimate your kidney function using the race-free CKD-EPI 2021 creatinine equation for glomerular filtration rate (eGFR).

A free online basic calculator with a full on-screen keypad — addition, subtraction, multiplication, division, percent, parentheses, memory (M+/M-/MR/MC), and a running calculation history.

A free online big number calculator for exact arbitrary-precision arithmetic (add, subtract, multiply, divide, exponentiation) on integers far beyond JavaScript's safe-integer range, powered by native BigInt.

A comprehensive fraction calculator for addition, subtraction, multiplication, division, simplification, and conversions.

A free online long division calculator that shows the quotient, remainder, and a full step-by-step long division work grid — with an option to continue dividing into decimal places instead of stopping at the remainder.

Free percent error calculator. Find the percent, signed, and absolute error between an experimental (measured) value and a theoretical (accepted) value.

A free online percentage calculator with four modes: X% of Y, X is what % of Y, percent increase/decrease from X to Y, and X plus or minus Y%.

A free online ratio calculator that simplifies a ratio to lowest terms, solves a proportion for a missing term, and scales a ratio by a factor or to a target total.

A free online rounding calculator that rounds any number to a chosen number of decimal places or to the nearest ten, hundred, or thousand, with five rounding modes: half up, half down, ceiling, floor, and half to even.

A free online scientific calculator with trigonometry (sin, cos, tan), degrees/radians toggle, logarithms, powers, roots, factorial, π and e constants, parentheses, and memory keys.

A free online binary calculator for arithmetic (add, subtract, multiply, divide) and bitwise (AND, OR, XOR, NOT, shift) operations on binary numbers, with the decimal equivalent shown alongside every result.

A free online exponent calculator that computes b^n for integer, decimal, and negative exponents, and shows the expanded multiplication form for small integer exponents.

A free online factor calculator that lists every factor (divisor) of a positive integer, along with its factor pairs — and tells you instantly whether the number is prime or composite.

A free online Greatest Common Factor (GCF / GCD) calculator for two or more numbers, showing the full Euclidean algorithm trace as step-by-step work.

Free half-life calculator for radioactive/exponential decay. Solve for remaining quantity, initial quantity, elapsed time, or half-life itself using N = N0 * (1/2)^(t / half-life).

A free online hexadecimal calculator for arithmetic (add, subtract, multiply, divide) and bitwise (AND, OR, XOR, NOT, shift) operations on hex numbers, with the decimal equivalent shown alongside every result.

A free online Least Common Multiple (LCM) calculator for two or more numbers, showing the full prime factorization method as step-by-step work.

A free online logarithm calculator that finds log base b of x, with dedicated common log (base 10) and natural log (base e) shortcuts, showing the full change-of-base work.

A free online matrix calculator for addition, subtraction, and multiplication of two matrices, plus determinant, inverse, and transpose of a single matrix, with a dynamically sized grid up to 4x4.

Free number sequence calculator. Solve for the nth term and sum of an arithmetic or geometric sequence, or auto-detect the sequence type and constant from a list of terms.

A free online prime factorization calculator that breaks any whole number down into its prime factors, shown both as a step-by-step factor list and in compact exponent notation (e.g. 360 = 2³ × 3² × 5).

A free online quadratic formula calculator that solves ax² + bx + c = 0, showing the discriminant, root classification, real or complex roots, vertex, and axis of symmetry.

Free random number generator. Generate a list of cryptographically random integers or decimals within a custom min/max range, with options for unique values and sort order.

A free online root calculator for square roots, cube roots, and arbitrary nth roots — handles negative numbers correctly under odd roots and shows simplified radical form for square roots of positive integers.

A free online scientific notation calculator that converts standard numbers to and from scientific notation, and performs addition, subtraction, multiplication, and division on numbers already in scientific notation.

A free, quick-use area calculator for 7 common 2D shapes — square, rectangle, triangle, circle, trapezoid, parallelogram, and ellipse. One simple formula per shape; for a deep, dedicated circle solver, use the Circle Calculator instead.

A free, deep circle calculator that derives radius, diameter, circumference, and area from any one known value, plus a bonus arc length and sector area solver for a given central angle.

Free distance calculator. Find the distance between two points in 2D or 3D space, plus the midpoint for 2D coordinates, using the Pythagorean-derived distance formula.

A free online Pythagorean theorem calculator that solves for a missing leg or hypotenuse of a right triangle given the other two sides, using a² + b² = c².

A free online right triangle calculator that solves every side (a, b, c), both acute angles, area, and perimeter from any two known values — a fuller solver than a basic Pythagorean theorem calculator.

A free online slope calculator that finds the slope, slope-intercept equation, distance, and midpoint between two points on a coordinate plane.

Free online surface area calculator for cubes, rectangular prisms, spheres, cylinders, and cones. Enter your dimensions to instantly find the total surface area.

A free online triangle calculator that solves any general (non-right) triangle from SSS, SAS, ASA, or AAS inputs using the Law of Cosines, Law of Sines, and Heron's formula.

Free online volume calculator for cubes, rectangular prisms, spheres, cylinders, and cones. Enter your dimensions to instantly find the total volume.

A free online average calculator that finds the mean, sum, count, minimum, and maximum of a variable-length list of numbers — add or remove rows as needed.

Free confidence interval calculator for a population mean, using sample mean, sample standard deviation, sample size, and a 90%, 95%, or 99% confidence level with standard z-critical values.

Free calculator that finds the mean, median, mode(s), range, sum, and count of a variable-length list of numbers — handles no-mode and multi-modal data sets automatically.

Free p-value calculator. Compute a p-value from a z-score or a t-score (with degrees of freedom), one-tailed or two-tailed, using the standard normal and Student's t distributions.

Free permutation (nPr) and combination (nCr) calculator with the full factorial-based formula breakdown, guarding against r > n, negative inputs, and non-integers.

Free probability calculator for single events, two independent events (AND/OR), complements, and combinatorial (n choose k) probability without replacement.

Free sample size calculator for surveys and studies. Find the required sample size from a confidence level, margin of error, and an estimated proportion or standard deviation, with optional finite population correction.

Free standard deviation calculator that finds population and sample standard deviation and variance from a variable-length list of numbers, with a step-by-step deviation-squared breakdown.

Free all-in-one statistics calculator: mean, median, mode, range, variance, standard deviation (population & sample), quartiles, IQR, sum, count, min, and max from a single list of numbers.

Free z-score calculator: find z from a value, mean, and standard deviation, solve for x in reverse, and get the percentile/area under the standard normal curve.

Free chronological age calculator. Find your exact age in years, months, and days from any birth date, with automatic leap year handling.

Find the number of years, months, weeks, and days between dates, or add/subtract time from a specific date.

Calculate your Semester and Cumulative GPA easily with our interactive tool. Plan your future grades and reach your academic goals.

Free grade calculator: find your weighted course grade and the score you need on your final exam to hit any target grade.

Add or subtract time values, compute time offsets from dates, and parse complex time expressions.

Calculate how long a file transfer will take based on file size, connection speed, and protocol overhead — or find the bandwidth needed to hit a target time.

Professional IPv4 subnet calculator for network administrators. Calculate network addresses, broadcast addresses, usable host ranges, and CIDR masks with ease.

Professional IPv6 subnet calculator. Plan your 128-bit network architecture, calculate prefix boundaries, and handle IPv6 address compression and expansion with ease.

Estimate the cooling or heating needs of your room or house with our BTU calculator. Calculate exact requirements based on size, insulation, and climate.

Estimate the volume and weight of concrete needed for slabs, columns, stairs, and more. Get precise bag counts and truck delivery estimates.

Calculate how much gravel you need for a driveway or path in cubic yards, cubic feet, and tons.

Add up the R-values of your wall or ceiling assembly's layers to find its total R-value, then estimate heat loss for a given area and temperature difference.

Calculate how much mulch you need for your garden beds in cubic yards, cubic feet, and standard 2 cu ft bags.

Calculate how many gallons of paint you need for a room based on its dimensions, number of coats, and paint coverage per gallon.

Calculate how many gallons your pool holds from its dimensions -- supports rectangular and circular/round pools.

Accurately estimate your total roof area and the necessary amount of materials needed, including roofing squares, bundles of shingles, and recommended overage.

Accurately estimate the square footage and total cost of materials for a variety of common shapes, including rectangles, circles, triangles, and more.

Accurately calculate the exact dimensions for stairs including total run, stringer length, number of steps, and angle of inclination.

Estimate the total number of tiles necessary to cover a floor, roof, or wall, including calculations for grout gaps, overlaps, and total box costs.

Estimate the cost of charging your electric vehicle from your battery size, charge level, and electricity rate -- and compare the cost per mile against a gas car.

Estimate the fuel needed and total cost for a trip based on distance, fuel efficiency, and price per gallon or liter.

Calculate your vehicle's fuel efficiency (MPG or L/100km) from the distance traveled and fuel used, plus your cost per mile or kilometer.

Estimate engine horsepower two ways — from quarter-mile trap speed and vehicle weight, or from torque and engine RPM.

Calculate your mileage reimbursement or tax deduction using the standard mileage rate for business, medical, moving, or charitable driving.

Calculate speed from distance and time, with instant results in mph, km/h, m/s, and knots.

Compare two tire sizes (e.g. 225/50R17) to see the difference in diameter, circumference, revolutions per mile, and speedometer accuracy.

Calculate density from mass and volume, with instant results in kg/m³, g/cm³, and lb/ft³.

Estimate the energy consumption and running cost of any electrical appliance based on its wattage, daily usage, and your electricity rate.

Convert mass between milligrams, grams, kilograms, metric tons, ounces, pounds, stone, and US tons instantly.

Calculate the molarity of a solution from solute mass, molar mass, and solution volume — a core calculation for chemistry lab work.

Calculate the molecular weight (molar mass) of any chemical formula, including compounds with parentheses like Ca(OH)2.

Solve for voltage, current, resistance, or power using Ohm's Law — enter any two known values and calculate the rest.

Decode 4-band or 5-band resistor color codes into resistance value and tolerance, instantly and accurately.

Estimate how many years it takes for a home solar panel system to pay for itself through electricity bill savings, and project 25-year lifetime savings.

Calculate voltage drop and percentage drop across a wire run based on wire gauge, material, distance, current, and circuit voltage.

Convert weight between kilograms and pounds, and see what you'd weigh on the Moon, Mars, Jupiter, and other planets based on their gravity.

Calculate the dew point from air temperature and relative humidity using the Magnus formula, and see how muggy it will actually feel.

Calculate the heat index — the "feels like" temperature from air temperature and relative humidity — using the NWS Rothfusz regression.

Calculate wind chill — the "feels like" temperature from wind speed and air temperature — using the official NWS formula.

Count the number of days between two dates or calculate a future/past date. Includes options for business days, weekends, and holidays.

Find the day of the week for any historical or future date. Discover fascinating trivia and facts about every day of the week.

Calculate the exact number of hours and minutes between two times or two dates with our free, online Hours Calculator.

Find the best bedtime or wake-up time based on 90-minute sleep cycles, so you wake up feeling rested instead of groggy.

Calculate the exact time difference between two times or dates. Get results in hours, minutes, and seconds with our precise duration tool.

Roll virtual dice online — choose the number of dice and sides (d4 to d100) and get instant results with the total.

Free Female Delusion Calculator: enter minimum height, income, and age standards and see what percentage of U.S. men meet all three, based on published population statistics.

Calculate Gross Domestic Product (GDP) using the expenditure approach — consumption, investment, government spending, and net exports.

Calculate your golf score differential from your score, course rating, and slope rating — the building block of the USGA Handicap Index.

Convert height between feet and inches, centimeters, and meters instantly, in either direction.

Free Male Delusion Calculator: enter maximum BMI and age standards and see what percentage of U.S. women meet both, based on published population statistics.

Convert numbers to Roman numerals or Roman numerals back to numbers, instantly and accurately, for values from 1 to 3,999.

Convert shoe sizes between US Men's, US Women's, UK, EU, and foot length in centimeters — a handy reference for international shopping.

Calculate the tip amount, total bill, and per-person split for any bill amount and tip percentage.