The Everything Calculator

Your Favorite Calculators

Bookmark a calculator and it'll show up here for quick access next time you visit.

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• Finance43 Calculators
• Real Estate9 Calculators
• Solar and Energy6 Calculators
• Home Improvement13 Calculators
• Health21 Calculators
• Everyday Math45 Calculators
• Date and Time9 Calculators
• Cooking and Food2 Calculators
• Auto and Insurance8 Calculators

Guided Journeys

Journeys walk you through a connected set of calculators step by step, automatically carrying your numbers from one to the next so you never have to type the same figure twice — then wrap it all up in one clean summary page with every result in one place.

• Home Buying Journey

  Buying a home means juggling several numbers at once: your take-home pay, how much house that actually affords, what the monthly mortgage payment will really cost, and whether your other debts leave enough room for a lender to approve you. This journey walks through all four in order, carrying each answer into the next calculator so you never have to look up or retype a figure you've already given us.

  1. Estimate Your Take-Home Pay
  2. See How Much Home You Can Afford
  3. Calculate Your Monthly Payment
  4. Check Your Debt-to-Income Ratio
  Start Journey →

• Personal Finance Journey

  Your paycheck is the starting point for almost every other financial decision: how much tax you'll actually owe for the year, and how much you can realistically set aside for retirement. This journey carries your income (and what's left after tax) forward through each step, ending with a suggested retirement contribution based on what you actually take home, not just your gross salary.

  1. See Your Take-Home Pay
  2. Estimate Your Full-Year Tax Liability
  3. Project Your Retirement Savings
  Start Journey →

• Solar Savings Journey

  Before you can tell whether solar panels are worth it, you need to know what you're actually paying for electricity today, how big a system would even cover that usage, and what payback period that system offers. This journey starts by estimating your current monthly bill from your usage and rate, carries that same usage figure into a system-size estimate (how many kW and panels you'd need), then carries the resulting bill total into the solar payback calculator so you get a real payback period without having to dig up a utility bill or size a system yourself.

  1. Estimate Your Current Electric Bill
  2. See What Size System You Need
  3. See Your Solar Payback Period
  Start Journey →

• Fuel Economy Journey

  Your vehicle's real-world fuel economy is the missing number behind almost every trip-cost estimate. This journey starts by calculating your actual MPG from a fill-up, then carries that figure into the fuel cost calculator so you get a trip or commute cost based on your car's real efficiency instead of a guess.

  1. Calculate your vehicle's MPG
  2. See what a trip will cost in fuel
  Start Journey →

• Car Buying Journey

  Buying a car involves more than just the sticker price: you need a realistic monthly payment, a clear answer on whether a cash rebate or a low promotional rate actually saves you more, and a sense of what the vehicle will cost to fuel once it's yours. This journey starts with the loan payment, carries the same vehicle price into the rebate-vs-low-rate comparison so you don't have to look it up twice, then walks through the vehicle's real-world fuel economy and what a typical trip or commute will cost in gas.

  1. Estimate Your Car Loan Payment
  2. Compare Rebate vs. Low-Interest Financing
  3. Calculate Your Vehicle's MPG
  4. See What a Fill-Up Trip Will Cost in Fuel
  Start Journey →

Most Popular Calculators

• PercentageFind what a percent of a number is, what percent one number is of another, the reverse percentage, or the change and difference between two values.
• MortgageCalculate your full monthly mortgage payment including taxes and insurance (PITI), total interest paid, and how much an extra payment could save you.
• AgeFind your exact age in years, months, and days (or weeks), as of today or any date, plus a countdown to your next birthday.
• Body Mass Index (BMI)Calculate your Body Mass Index (BMI), weight category, healthy weight range, BMI Prime, and Ponderal Index.
• LoanCalculate the fixed monthly payment (EMI), total cost, and total interest for a personal, auto, or other fixed-rate installment loan.
• UnitConvert between length, weight, volume, temperature, area, speed, time, digital storage, pressure, energy, power, and angle units instantly.
• Income TaxEstimate your federal income tax liability, effective tax rate, and after-tax income for the year.
• Date & Time DurationFind the exact duration between two dates and times — in days, hours, and minutes, or weeks and remaining days.
• Auto LoanEstimate your monthly car payment from the vehicle price, down payment, trade-in (including any amount still owed), incentives, fees, sales tax, and loan term.
• Compound InterestSee how a savings or investment balance grows over time with compounding interest, optional monthly contributions, and inflation-adjusted purchasing power.
• ConcreteCalculate how much concrete you need for a slab, patio, walkway, or round post/deck footing — in cubic yards or bags — plus weight and project guidance.
• TipCalculate the tip amount, total bill, and per-person split for any bill, with optional tax and rounding.

All Calculators

• AgeFind your exact age in years, months, and days (or weeks), as of today or any date, plus a countdown to your next birthday.
• Annual Percentage Rate (APR)Find a loan's true effective annual rate once fees and closing costs are folded in, not just its stated interest rate.
• AreaCalculate the area (and perimeter or circumference) of a rectangle, square, circle, triangle, or trapezoid.
• Army Body FatEstimate your body fat percentage using the U.S. Army's circumference-based body composition standard (AR 600-9).
• Auto LeaseEstimate your monthly car lease payment from the vehicle price, down payment, residual value, term, and APR.
• Auto LoanEstimate your monthly car payment from the vehicle price, down payment, trade-in (including any amount still owed), incentives, fees, sales tax, and loan term.
• Average Height ComparisonSee how your height compares to the average for your age and gender.
• Baking Ingredient WeightConvert cups, tablespoons, or teaspoons of a specific baking ingredient into its weight in grams and ounces.
• Bandwidth (Download Time)Estimate how long a file transfer will take from the file size and your connection speed.
• Blood Alcohol Content (BAC)Estimate blood alcohol content from the number of standard drinks, body weight, biological gender, and time elapsed, using the Widmark formula.
• Body Fat PercentageEstimate your body fat percentage from height, neck, waist, and hip measurements using the U.S. Navy Circumference Method.
• Body Frame SizeEstimate your skeletal body frame size (small, medium, or large) from your height-to-wrist-circumference ratio.
• Body Mass Index (BMI)Calculate your Body Mass Index (BMI), weight category, healthy weight range, BMI Prime, and Ponderal Index.
• Body Surface AreaEstimate your body surface area (BSA) from height and weight using three published formulas (DuBois, Mosteller, and Haycock) plus their average.
• BondCalculate a bond's fair price from its face value, coupon rate, market yield, and years to maturity.
• Break-Even PointFind how many units you need to sell — and how much revenue that takes — before your fixed costs are fully covered.
• BTU / Air Conditioner SizingCalculate the BTU rating you need for a room based on its size, ceiling height, occupants, and sun exposure.
• BudgetSplit your monthly take-home income into needs, wants, and savings using the 50/30/20 budgeting rule, and compare it against what you actually spend.
• Business DaysCount the number of business days (weekdays) between two dates, or find the date a number of business days from now.
• Calorie / TDEEEstimate your Total Daily Energy Expenditure (TDEE) and calorie targets for weight loss (at three paces) or gain, with a choice of BMR formula.
• Calories BurnedEstimate calories burned during exercise from the activity, your body weight, and how long you did it, using standard MET values.
• Car DepreciationEstimate a vehicle's resale value after a number of years using a commonly-cited real-world depreciation curve.
• Cash Back vs. Low InterestCompare a dealer cash rebate at the standard rate against a low promotional rate at full price to see which actually costs less.
• Certificate of Deposit (CD)Calculate the maturity value of a Certificate of Deposit, plus what an early withdrawal penalty would cost.
• Child Height PredictorEstimate a child's likely adult height from both parents' heights using the mid-parental height method.
• CircleFind a circle's radius, diameter, circumference, and area — enter any one of them and this calculator solves for the other three.
• Closing CostsEstimate the one-time fees due at closing on a home purchase, separate from the down payment.
• College CostProject a college's future cost using a tuition inflation rate, and find the monthly savings needed to cover it.
• CommissionCalculate commission earned from a sale, plus total pay if you also have a base salary.
• Compound InterestSee how a savings or investment balance grows over time with compounding interest, optional monthly contributions, and inflation-adjusted purchasing power.
• ConcreteCalculate how much concrete you need for a slab, patio, walkway, or round post/deck footing — in cubic yards or bags — plus weight and project guidance.
• Confidence IntervalFind the confidence interval for a population mean, given a sample's mean, standard deviation, and size.
• Credit Card PayoffFind out how long it will take to pay off a credit card at your current payment, or what payment you need to hit a payoff goal.
• Credit Utilization RatioFind your credit utilization ratio and where it falls against commonly-cited credit-score guidance.
• CurrencyConvert between currencies using live, daily-updated exchange rates — no login, no fees, just today's real rate.
• Date & Time DurationFind the exact duration between two dates and times — in days, hours, and minutes, or weeks and remaining days.
• Day of the WeekFind out what day of the week any past, present, or future date falls on.
• Days Until / CountdownFind out exactly how many days, weeks, and days remain until a date — or how long ago it was.
• Debt PayoffCompare the debt avalanche and debt snowball payoff strategies across multiple debts — months to debt-free and total interest, side by side.
• Debt-to-Income (DTI)Calculate your front-end and back-end debt-to-income (DTI) ratio and see how it compares to common mortgage-lending guidelines.
• DensitySolve for density, mass, or volume from the other two, in your choice of common mass and volume units.
• DepreciationBuild a straight-line or double-declining-balance depreciation schedule for a business asset, from its cost, salvage value, and useful life.
• Dew PointEstimate dew point from air temperature and relative humidity using the Magnus formula.
• Dice RollerRoll any number of dice with any number of sides, plus an optional modifier — see the total and every individual roll.
• DiscountFind the sale price, amount saved, or original price for a percent-off, fixed-amount, or reverse discount, with optional stacking and sales tax.
• Distance, Midpoint & SlopeFind the distance, midpoint, and slope between two coordinate points on a graph.
• Dividend YieldFind a stock's dividend yield from its annual dividend per share and current price, plus your total annual income from shares owned.
• Down PaymentCalculate your down payment amount or percentage, resulting loan size, and whether PMI is likely required.
• DrywallFind out how many drywall sheets you need for a room, based on its dimensions and your chosen sheet size.
• Electricity CostEstimate your monthly and yearly electricity cost from your usage in kWh and your rate per kWh.
• Emergency FundFind how many months of expenses your current savings covers, your target fund size, and how long it takes to close the gap.
• Estate TaxEstimate federal estate tax liability on the portion of an estate above the current exemption amount.
• Feels Like TemperatureCalculate wind chill for cold, windy conditions or heat index for hot, humid conditions, using the official National Weather Service formulas.
• FencingCalculate how many fence posts, rail sections, and rails you need for a straight fence run.
• FHA / VA LoanEstimate your monthly payment on an FHA or VA loan, including each program's own upfront and ongoing mortgage insurance fees.
• FlooringCalculate how much flooring material to order for a room, including a waste margin and estimated cost.
• FractionAdd, subtract, multiply, or divide two fractions (including mixed numbers), or convert a decimal to its simplest fraction.
• Freelance Hourly RateFind the hourly rate you need to charge to hit a target income, based on realistic billable hours and business expenses.
• Fuel CostCalculate how much fuel a trip will cost from the distance, your vehicle's fuel economy, and the price of fuel.
• Gas Mileage (MPG)Calculate your vehicle's fuel economy in MPG or liters per 100 km from the distance traveled and fuel used.
• GFR / eGFREstimate your kidney function (eGFR) from a serum creatinine blood test result using the 2021 CKD-EPI race-free equation.
• Golf HandicapEstimate your golf handicap index from your recent scores using the official USGA World Handicap System formula.
• GradeFind the minimum score you need on a final exam to reach your target overall grade.
• Grade Point Average (GPA)Calculate your weighted or unweighted GPA from a list of course grades and credit hours, fold in a previous cumulative GPA, or find the GPA you need this term to hit a target.
• GravelCalculate how much gravel you need for a path, driveway, or garden bed, in cubic yards and tons.
• Greatest Common Factor and Least Common MultipleFind the Greatest Common Factor (GCF) and Least Common Multiple (LCM) of two or more whole numbers.
• Hiring CostFind the true cost of a new hire beyond their salary — employer payroll taxes, benefits, onboarding, and overhead included.
• Home Equity / HELOCCalculate your home equity and how much you could borrow with a home equity loan or HELOC, based on your lender's maximum loan-to-value ratio.
• HorsepowerEstimate a vehicle's horsepower from its quarter-mile trap speed or elapsed time and weight.
• Hours WorkedCalculate total hours worked between a clock-in and clock-out time, minus any unpaid break, plus total pay at an hourly rate.
• Ideal WeightEstimate a reference body weight from your height and gender using four published formulas (Devine, Robinson, Miller, and Hamwi) plus their average.
• Income TaxEstimate your federal income tax liability, effective tax rate, and after-tax income for the year.
• InflationSee what an amount of money from one year is worth in another year's dollars, using real historical U.S. inflation data.
• Internal Rate of Return (IRR)Find an investment's internal rate of return — the annual return implied by its own cash flows.
• IP SubnetFind the network address, broadcast address, subnet mask, and usable host range for an IPv4 address and CIDR prefix.
• Lean Body MassEstimate your lean body mass (weight minus fat mass) from height, weight, and gender using three published formulas (Boer, James, and Hume) plus their average.
• Life Insurance NeedsEstimate how much life insurance coverage you need using the DIME method (Debt, Income, Mortgage, Education).
• LoanCalculate the fixed monthly payment (EMI), total cost, and total interest for a personal, auto, or other fixed-rate installment loan.
• Long DivisionDivide two whole numbers and see the quotient, remainder, decimal result, and the full step-by-step long division process.
• MacroSplit a daily calorie target into protein, carb, and fat grams using a common diet-style split (balanced, low-carb, high-protein, keto) or your own custom percentages.
• MarginFind profit margin, markup, and profit from cost and selling price — or solve for whichever one you don't already know.
• MatrixAdd, subtract, multiply, transpose, or find the determinant of a matrix of any size, with a resizable grid input.
• Mileage DeductionEstimate a tax deduction or reimbursement from miles driven, using the IRS standard mileage rate method.
• MortgageCalculate your full monthly mortgage payment including taxes and insurance (PITI), total interest paid, and how much an extra payment could save you.
• Mortgage AffordabilityEstimate how much home you can afford based on your income, debts, and down payment, using the standard 28/36 rule.
• Mortgage PayoffSee how switching to biweekly mortgage payments (plus an optional one-time extra payment) speeds up your payoff and cuts total interest.
• MulchCalculate how much mulch you need for a garden bed in cubic yards and standard bags, from its length, width, and depth.
• Net WorthCalculate your net worth by adding up your assets and subtracting your liabilities.
• Number BaseConvert a number between binary, octal, decimal, and hexadecimal.
• Ohm's LawSolve for voltage, current, or resistance from the other two using Ohm's Law, plus the resulting power.
• One-Rep-MaxEstimate the heaviest weight you could lift for one rep, from a weight and rep count you've already lifted.
• OvulationEstimate your ovulation date, fertile window, and next expected period from the first day of your last period and your average cycle length.
• P-ValueFind the p-value for a given z-score in a one-tailed or two-tailed hypothesis test, and whether it is statistically significant.
• PaintCalculate how much paint you need for a room based on its dimensions, doors, windows, and number of coats.
• Password GeneratorGenerate a strong, random password from a chosen mix of uppercase, lowercase, numbers, and symbols, with its entropy in bits and a plain-language strength rating.
• Payback PeriodFind how long it takes an investment's cash flows to pay back its initial cost, from a uniform or year-by-year cash flow.
• Paycheck / SalaryEstimate your take-home pay per paycheck from your annual salary, using current federal tax brackets and FICA payroll taxes.
• PensionEstimate a defined-benefit pension payout from your years of service, benefit multiplier, and final average salary.
• Percent ErrorFind the percent error between an experimental (measured) value and a theoretical (accepted) value.
• PercentageFind what a percent of a number is, what percent one number is of another, the reverse percentage, or the change and difference between two values.
• Permutation and CombinationFind the number of permutations (nPr) and combinations (nCr) for choosing r items from a total of n.
• Pet AgeConvert your dog's or cat's age into human-year equivalent using the published veterinary age charts.
• Pregnancy Due DateEstimate your due date and how far along you are, from your last period, conception date, or IVF transfer date.
• Pregnancy Weight GainFind your recommended total pregnancy weight gain range based on your pre-pregnancy BMI, using the IOM guidelines.
• Present ValueFind what a future amount of money is worth today, discounted at a given annual rate.
• Prime FactorizationBreak a whole number down into its prime factors, and find out whether it is itself a prime number.
• ProbabilityFind the probability of a single event, or the combined probability of two independent events.
• Property TaxEstimate your annual property tax from your home's market value, assessment ratio, and local tax rate.
• Quadratic FormulaSolve any quadratic equation of the form ax² + bx + c = 0, including complex roots.
• Random Number GeneratorGenerate one or more random whole numbers within a range, with or without repeats.
• RatioSimplify a ratio to its lowest terms, or solve a proportion for its missing fourth term.
• RebarCalculate how much rebar you need for a concrete slab or footing — bar count in each direction, total linear footage, standard bars to buy, and wire ties needed.
• Recipe ScalingScale a recipe up or down for a different number of servings — enter your ingredients once and get every quantity recalculated.
• RefinanceCompare your current loan against a refinance offer — monthly savings, break-even on closing costs, and lifetime interest.
• Rent vs. BuyCompare the long-term net worth of renting vs. buying a home, including mortgage costs, appreciation, and the opportunity cost of your down payment.
• Rental PropertyEstimate a rental property's monthly cash flow, cap rate, and cash-on-cash return from its price, financing, rent, and expenses.
• Required Minimum Distribution (RMD)Find the IRS Required Minimum Distribution you must withdraw each year from a Traditional IRA or 401(k).
• Resistor Color CodeDecode a 4-band resistor color code into its resistance in ohms, kilohms, or megohms, plus its tolerance range.
• Retirement / 401(k) SavingsProject your retirement balance, solve for how much to save, find a sustainable withdrawal rate, or see how long your money will last.
• Return on Investment (ROI)Calculate the return on an investment as a percentage, net profit, and (given a holding period) its annualized rate of return.
• Roman NumeralConvert a number to a Roman numeral, or a Roman numeral back to a number.
• RoofingCalculate how many roofing squares and bundles of shingles you need, accounting for your roof's pitch.
• Roth vs. Traditional IRACompare a Traditional IRA (taxed on withdrawal) against a Roth IRA (taxed upfront, tax-free withdrawal) to see which nets more money in retirement.
• RoundingRound a number to a set number of decimal places, significant figures, or the nearest multiple.
• Rule of 72Use the classic Rule of 72 mental-math shortcut to estimate how long an investment takes to double — or what rate it takes to double in N years.
• Running PaceFind your running pace, finish time, or distance — solve for whichever one you don't already know.
• SaaS MetricsTurn your revenue per customer, churn, gross margin, and acquisition cost into LTV, CAC payback period, and the LTV:CAC ratio.
• Sales TaxAdd sales tax to a price, or work backward from a tax-included total to find the price before tax.
• Sample SizeFind how many respondents or observations a survey needs to estimate a proportion within a chosen margin of error and confidence level.
• ScientificA full scientific calculator with trig functions, logarithms, exponents, factorial, and parentheses.
• Scientific NotationConvert a standard number to scientific notation, or a scientific notation coefficient and exponent back to a standard number.
• Simple InterestCalculate simple (non-compounding) interest on a principal amount over a given time period.
• Sleep CycleFind the best bedtime or wake-up time based on 90-minute sleep cycles, so you wake up between cycles instead of in the middle of one.
• Social Security Claiming AgeSee how claiming Social Security earlier or later than your Full Retirement Age changes your monthly benefit.
• Sod / Grass SeedCalculate how many sod pallets or how many pounds of grass seed you need to cover your lawn's area.
• Solar CO2 SavingsEstimate the CO2 emissions your solar system avoids each year, using the EPA's own greenhouse gas equivalencies.
• Solar Panel SavingsEstimate your solar panel payback period and lifetime savings from your system cost and electric bill.
• Solar Panel System SizeEstimate the solar system size (in kW) and number of panels needed to offset your electricity usage.
• SpeedSolve for speed, distance, or time from the other two, in your choice of common distance and speed units.
• Square Root / Nth RootFind the square root, cube root, or any nth root of a number, including real roots of negative numbers.
• StairsWork out the number of steps, riser height, tread depth, and stringer length for a staircase.
• Startup RunwayFind how many months of cash your business has left at its current burn rate, and the projected date it runs out.
• StatisticsCalculate the mean, median, mode, range, variance, and standard deviation of any list of numbers.
• Student LoanEstimate your student loan payment including deferment interest that capitalizes into your principal once repayment begins.
• Target Heart RateFind your target heart rate zones for exercise based on your age and resting heart rate.
• TileCalculate how many tiles you need for a floor, including grout spacing and a waste allowance.
• Time CardAdd up a full work week of daily clock-in and clock-out times into total hours, with regular vs. overtime pay.
• Time ZoneConvert a date and time from one time zone to another, including Daylight Saving Time.
• TipCalculate the tip amount, total bill, and per-person split for any bill, with optional tax and rounding.
• Tire SizeCompare two tire sizes to see the difference in overall diameter and how it affects your speedometer accuracy.
• TriangleFind a triangle's area, perimeter, and all three angles from its three side lengths, plus whether it's equilateral, isosceles, or scalene, and acute, right, or obtuse.
• UnitConvert between length, weight, volume, temperature, area, speed, time, digital storage, pressure, energy, power, and angle units instantly.
• Voltage DropCalculate how much voltage is lost over a wire run based on its gauge, length, material, and current.
• VolumeCalculate the volume and surface area of a rectangular prism, cube, sphere, cylinder, or cone.
• Waist-to-Hip RatioFind your waist-to-hip ratio and where it falls on the World Health Organization's health-risk scale.
• Z-ScoreFind a value's z-score and percentile within a normal distribution, given the distribution's mean and standard deviation.