Free calculators for finance, health, math & everyday life

Estimate your monthly mortgage payment, total interest, and payoff schedule.

Monthly car payment from price, down payment, trade-in, and sales tax.

Compute the fixed monthly payment on any amortizing loan.

Monthly payment and total cost for a personal loan.

Payment and interest cost for a business term loan.

Estimate monthly payment and total interest on a student loan.

Estimate monthly payments on a boat loan.

Monthly payment for a recreational vehicle loan.

Estimate the monthly payment for a vehicle lease.

Year-by-year principal, interest, and remaining balance schedule.

True annual percentage rate on a loan with fees.

Compare current vs. refinanced mortgage payments and break-even.

See how extra monthly payments shorten your mortgage.

Estimate FHA mortgage payment with MIP.

VA loan payment with funding fee.

Project the future value of savings with compounding and periodic contributions.

Interest earned or owed under simple (non-compounding) interest.

Project future value of a lump sum plus regular contributions.

Project retirement balance and check the 4% withdrawal rule.

Project tax-free Roth IRA balance at retirement.

Project a 401(k) balance including employer match.

Certificate of deposit interest and maturity value.

Monthly deposit needed to reach a savings goal by a target date.

Return on investment as a percentage plus annualized rate.

Price a bond from face value, coupon, yield, and maturity.

Future value of an ordinary annuity.

Project 529 college savings growth.

Estimate monthly Social Security retirement benefit.

Projected 4-year college cost with tuition inflation.

Convert a dollar amount across years at an assumed inflation rate.

Convert between hourly, weekly, monthly, and annual pay.

Estimate net pay after federal, FICA, and state deductions.

Estimated US federal income tax using 2024 brackets.

Add or reverse sales tax from a pre- or post-tax price.

Add or reverse Value Added Tax from net or gross price.

Estimate annual property tax from assessed value and mill rate.

Estimate federal estate tax (2024).

Sale price and savings from a list price and discount percent.

Profit margin, markup, and selling price from cost and revenue.

Split a restaurant bill with tax and tip across any number of people.

Straight-line depreciation of an asset over its useful life.

Convert between currencies using a manual exchange rate.

Months to pay off a debt at a fixed monthly payment.

See if consolidating debts into one loan lowers your payment.

Months to pay off a credit card balance at a fixed monthly payment.

50/30/20 monthly budget split from take-home pay.

Down payment amount and PMI implications from home price and percent.

Compare total costs of renting versus buying over a horizon.

Estimate available home equity and HELOC borrowing power.

Cash flow, cap rate, and cash-on-cash return for a rental.

Total monthly cost of home ownership (PITI + HOA).

Cash flow and returns on an income property.

Assets minus liabilities, at a glance.

Units and revenue needed to cover costs.

How long an investment takes to repay itself.

Capitalization rate on a rental property.

Dividend income, yield and reinvested growth.

Weekly pay with overtime and double-time hours.

Commission earned on sales, with base pay.

Monthly amount needed to hit a savings target.

Monthly cash burn and months of runway remaining.

Estimate business value using an earnings multiple (SDE/EBITDA).

Net cash flow from operating, investing and financing activities.

Revenue lost to customer churn and net revenue retention.

Cost per lead and per converted customer across a funnel.

CAC from total sales & marketing spend and new customers won.

CLV from average order value, purchase frequency and margin.

Earnings before interest, taxes, depreciation & amortization.

Hourly rate needed to hit a target income as a freelancer.

Gross profit and gross margin from revenue and COGS.

Estimate take-home pay after taxes and deductions.

Convert an hourly wage into annual, monthly and weekly salary.

How many times inventory is sold and replaced per year.

Early-payment discount savings (e.g. 2/10 net 30 terms).

Late payment fee and total amount owed on an overdue invoice.

Approximate internal rate of return for level annual cash flows.

Compare total cost of leasing vs buying business equipment.

Interest and time saved by paying extra on a loan (EMI).

Convert between profit margin and markup percentages.

Selling price from cost and desired markup percentage.

Discounted cash flow value of an investment over 5 years.

Employer and employee FICA-style payroll tax estimate (US).

Project future sales using a constant growth rate.

SE tax on net self-employment earnings (US 15.3% rule).

Working capital and current ratio from balance sheet items.

Weekly allowance based on age, chores and savings split.

Periodic payment a lump sum can sustain.

Approximate YTM for a coupon bond.

Compound annual growth rate between two values.

Estimated tax owed on short- or long-term gains.

Blended average cost after adding to a position.

Profit/loss on a cryptocurrency trade, after fees.

Shares and average cost from periodic fixed investments.

Portfolio growth with dividends reinvested vs taken as cash.

Target cash cushion based on monthly expenses.

Long-term cost of fund fees on portfolio growth.

Portfolio size needed for financial independence.

What a lump sum plus contributions grows to.

Divide an estate among heirs by equal or custom shares.

Leveraged return and margin call price.

Daily/monthly profit from crypto mining.

Stock price needed to break even on a call or put.

Trades needed to return to target stock/bond allocation.

What a future sum is worth today.

Quick estimate of years to double your money.

Compounded staking income over time.

Profit or loss on a stock trade, after fees.

US federal tax owed, marginal bracket, and effective rate.

Charitable giving amount from income or wealth.

Discount yield and investment return on a T-bill.

Body Mass Index from height and weight, in metric or US units.

Basal Metabolic Rate from the Mifflin–St Jeor equation.

Total Daily Energy Expenditure from BMR and activity level.

Daily calorie needs for maintenance, cutting, and bulking.

Protein, carbs, and fat targets from calorie intake.

Daily protein target in grams based on body weight and activity.

Recommended daily fat grams from calorie target.

Daily carb grams from your calorie target.

AHA-recommended daily added sugar limit.

Ideal body weight range from height and sex using multiple formulas.

How many pounds you are above a healthy BMI range.

Estimate body fat percent from body measurements (US Navy method).

Estimate lean body mass using the Boer formula.

Training zones from age using the Karvonen method.

Training zones from your max heart rate.

Estimate 1RM from a submaximal lift (Epley formula).

Daily water needs based on weight and activity.

Running pace, time, or distance — solve for any of the three.

Estimated due date from last menstrual period (Naegele's rule).

Estimate ovulation and fertile window from cycle length.

Recommended pregnancy weight gain range.

Estimated blood alcohol content by the Widmark formula.

Energy burned by activity using MET values.

Convert daily step count into calories and distance.

BSA by Du Bois, Mosteller and Haycock formulas.

WHR and the health risk band it falls in.

Estimate adult height from parents' heights.

Lifetime money spent on cigarettes.

Convert HbA1c percentage to estimated average glucose.

Body fat percentage using the U.S. military circumference method.

Total daily energy expenditure adjusted for training volume.

Classify blood pressure reading using AHA categories.

How much caffeine remains in your system over time.

Daily deficit needed to lose weight at your target rate.

Approximate BMI percentile for children and teens.

Total cholesterol to HDL ratio and cardiovascular risk indicator.

Cockcroft-Gault estimate of creatinine clearance.

Estimate cycling speed from power output.

Estimated glomerular filtration rate (kidney function) using CKD-EPI.

Fat-Free Mass Index to gauge muscularity.

The calendar date you'll likely hit your goal weight.

Gauge cardiovascular fitness from post-exercise heart rate drop.

Predict your marathon finish from a recent race result.

Estimated maximum heart rate using multiple formulas.

Average cycle length and predicted next period from recent cycles.

Even-pace splits for any race distance.

Best bedtimes or wake times based on 90-minute sleep cycles.

Pace per 100m/yards and projected race times.

Calories burned adjusting for treadmill incline.

Estimate aerobic fitness from a timed run.

A simple screen for central obesity risk.

Calories burned walking at a given speed and duration.

Estimate how long it will take to reach your goal weight.

Percent of a number, percent change, and reverse percent problems.

Absolute and percent error between a measured and accepted value.

Add, subtract, multiply, or divide two fractions with simplification.

Weighted grade-point average from letter grades and credit hours.

Cumulative GPA across multiple semesters, weighted by credits.

Weighted high school GPA with Regular, Honors, and AP/IB boosts.

Convert a 4.0-scale GPA (or 10-scale CGPA) into a percentage.

Convert a percentage grade into a 4.0-scale GPA or 10-point CGPA.

Final exam score needed to reach a target course grade.

Convert correct answers into percentage, letter grade, and curved score.

Convert a class rank into a top-N% percentile.

Mean, median, mode, range, variance, and standard deviation.

P(A ∪ B), P(A ∩ B), and conditional probability from two events.

Count ordered permutations P(n,r) and unordered combinations C(n,r).

Greatest common factor and least common multiple of two integers.

Check primality and list all prime factors.

Compute any base raised to any power, including fractional and negative.

Logarithm in any base, plus natural log and log base 10.

nth root of a number.

Solve ax² + bx + c = 0 for real or complex roots.

Slope and equation of a line from two points.

Euclidean distance between two 2D or 3D points.

Area, circumference, and diameter from a circle radius.

Area, perimeter, and heights from three sides (Heron's formula).

Hypotenuse and angles from the two legs.

Find the missing side of a right triangle: a² + b² = c².

Amount remaining after time for exponential decay.

Convert a number to and from scientific notation.

Determinant and inverse of a 2×2 matrix.

Solve A:B = C:D for the missing term.

Round to decimal places, integer, tens, hundreds, thousands.

Convert between decimal, binary, octal, and hexadecimal.

Uniformly random integers or decimals in any range.

Increase or decrease between two numbers.

Mean of a list of numbers, plus sum and count.

nCr combinations and nPr permutations.

n! for whole numbers, with digit count.

Arithmetic and geometric sequence terms and sums.

Round a number to a chosen number of sig figs.

Surface area and volume of a rectangular box.

Add, subtract, multiply and divide complex numbers.

Volume and surface area of a right circular cone.

Reflect or rotate a 2D point.

Cross product and magnitude of two 3D vectors.

Volume, surface area and diagonal of a cube.

Real root(s) of ax³ + bx² + cx + d = 0.

Volume and surface area of a cylinder.

Dot product and angle between two 2D vectors.

Area and approximate perimeter of an ellipse.

Find the hypotenuse of a right triangle.

Find a side from two sides and the included angle.

Find a missing side or angle using the law of sines.

Solve ax + b = c for x.

Midpoint between two coordinate points.

Area of a parallelogram from base and height.

Interior and exterior angles of a regular polygon.

Volume of a pyramid with a square base.

Area and perimeter of a rectangle.

Area and perimeter of a regular polygon.

Arc length and sector area from radius and angle.

Scale factor and missing side of similar triangles.

Volume and surface area of a sphere.

Solve a1x + b1y = c1 and a2x + b2y = c2.

Area of a trapezoid from parallel sides and height.

Add two 2D vectors and find the resultant magnitude.

Probability of exactly k successes in n trials.

Chance of getting exactly k heads in n flips.

Confidence interval for a sample mean.

Pearson's r between two paired data sets.

Odds of a target sum when rolling multiple dice.

All divisors, GCD and LCM across up to four numbers.

Average outcome of a probabilistic bet or event, over the long run.

Best-fit line (y = mx + b) through paired data.

Margin of error for a survey proportion.

Central tendency of a data set: mean, median and mode.

Remainder of a division (a mod n).

Probability that X falls below, above or between values.

Convert a number between binary, octal, decimal and hex.

Spell out a number in English words.

Convert between probability, decimal odds and fractional odds.

Find the percentile rank of a value in a data set.

Probability of k events given an average rate λ.

Solve for the missing value in a/b = c/d.

Q1, median, Q3 and interquartile range with outlier bounds.

Convert numbers to Roman numerals and back.

Minimum sample size needed for a survey.

Sample and population standard deviation and variance.

Sample and population variance of a data set.

Average of values weighted by importance.

How many standard deviations a value is from the mean.

Exact age in years, months, and days between two dates.

Add or subtract days from a date, or find days between two dates.

Hours and minutes between a start and end time, minus break.

Add or subtract hours, minutes, and seconds.

Shift a date forward or backward by a number of days.

Exact age expressed in days, hours and minutes.

Count weekdays (Mon–Fri) between two dates.

Chinese zodiac animal and element from a birth year.

Time remaining until a future date and time.

Find which day of the week any date falls on.

Exact number of days separating two calendar dates.

Convert between HH:MM time and decimal hours.

Duration between two clock times on the same day.

Which named generation a birth year belongs to.

Check whether a year is a leap year.

Local meeting time for a remote participant given a UTC offset gap.

Convert between 12-hour and 24-hour clock time.

Calendar months and days separating two dates.

Deadline date given a start date and business-day duration.

Which calendar or fiscal quarter a date falls in.

Estimated calendar date you reach retirement age.

Weekday school days left until the last day of term.

Total weekly hours from five daily clock-in/out pairs.

Add two durations given in hours, minutes and seconds.

Hour difference between two fixed UTC offsets.

ISO 8601 week number for a given date.

Full weeks and remaining days between two dates.

Find the date N business days after a start date.

Western astrological sign from a birth date.

Area of rectangular rooms, plus optional material cost.

Volume of common 3D shapes: box, cylinder, sphere, cone.

Cubic yards of concrete for a slab.

Number of tiles for a floor or wall area.

Shingle squares needed for a roof.

Cubic yards of mulch for a garden bed.

Tons of gravel for a driveway or path.

Rise, run, and stringer length for a staircase.

AC or heater BTU needed to cool or heat a room.

Best bedtimes based on 90-minute sleep cycles.

Trip fuel cost from distance, fuel economy, and price per gallon.

Compute MPG from miles and gallons.

Solve for speed, distance, or time.

Perceived temperature from air temp and wind.

Apparent temperature from heat and humidity.

Estimate password entropy in bits.

Gallons of paint needed for a room.

Posts, rails and panels for a fence run.

Sheets, screws, mud and tape for a room.

Cost of running an appliance per day, month and year.

Compare two package sizes to find the better deal.

Convert between Celsius, Fahrenheit, and Kelvin.

Convert between mm, cm, m, km, in, ft, yd, and mi.

Convert between mg, g, kg, ton, oz, lb, and stone.

Convert between mph, km/h, m/s, knots, and ft/s.

Convert between sq ft, sq m, acres, hectares, and sq km.

Convert between gallons, liters, cups, quarts, and milliliters.

Convert between seconds, minutes, hours, days, weeks, and years.

Convert between energy units.

Convert between power units.

Convert between pressure units.

Convert between digital storage units.

Convert degrees, radians, and gradians.

BTU cooling capacity needed for a room.

Asphalt tonnage needed for a driveway or lot.

How long a battery backup will power a load.

CMU blocks and mortar bags for a wall.

Number of bricks needed for a wall.

Estimated overage fee for exceeding lease mileage.

Carpet area and cost including padding.

Number of deck boards needed for a given area.

Cost to charge an electric vehicle and per-mile cost.

Flooring material needed with waste allowance.

Compare fuel costs between two vehicles over time.

Generator wattage needed to run selected appliances.

Convert between engine horsepower, torque and RPM.

Combined R-value of layered insulation materials.

Board feet and cost for dimensional lumber.

Number of 4×8 plywood sheets needed for an area.

Chlorine and pH adjuster dosing by pool volume.

Gallons in a rectangular pool.

Rebar pieces and length for a slab grid.

Siding squares and cost for exterior walls.

Number of solar panels needed to cover energy use.

Number of sprinkler heads needed for a lawn area.

Compare diameter and speedometer effect of two tire sizes.

Cubic yards of topsoil needed for an area.

Number of wallpaper rolls needed for a room.

Atmospheric pressure at a given altitude (barometric formula).

Convert women's clothing sizes between US, UK, EU.

Convert between cups, tablespoons, teaspoons and millilitres.

Convert density between kg/m³, g/cm³ and lb/ft³.

Dew point temperature from air temperature and humidity.

Convert flow rate between L/min, GPM, m³/h and CFM.

Convert force between Newtons, pounds-force and kgf.

Convert frequency between Hz, kHz, MHz, GHz and RPM.

Convert MPG (US/UK) to L/100km and vice versa.

Convert relative humidity to absolute humidity (g/m³).

Solve PV = nRT for pressure, volume, moles or temperature.

Convert luminous intensity between lux, lumens and foot-candles.

Solution molarity from mass, molar mass and volume.

Solve for voltage, current, resistance or power.

Celsius, Fahrenheit, gas mark and fan oven settings.

Convert between parts-per-million, percent and ppb.

Convert radiation dose between Sievert, rem, Gray and rad.

Power dissipated by a resistor and safety margin.

Convert shoe sizes between US, UK, EU and centimetres.

How sound pressure level (dB) drops with distance.

Convert torque between N·m, ft-lb and kg·cm.

Words per minute and accuracy from a typing test.

Voltage drop across a wire run given gauge and length.

Convert between wavelength and frequency for waves.

Estimated safe current-carrying capacity by AWG size.