Everyday math, done plainly.

Free calculators for mortgages, paychecks, taxes, savings, tips, health, and dates. Type your numbers and see the answer instantly. Nothing you enter leaves your browser.

MoneyMortgages, loans, savings, pay

Mortgage CalculatorMonthly payment with tax, insurance, PMILoan CalculatorAuto or personal loan paymentsCompound Interest CalculatorWatch savings grow over timeCredit Card Payoff CalculatorMonths to debt-free and interestRetirement Savings Calculator401(k) growth with employer matchHourly to Salary CalculatorHourly wage ↔ yearly salary

Taxes & PayTake-home pay, refunds, 1099 tax

Paycheck CalculatorTake-home pay after taxes, by stateIncome Tax & Refund CalculatorWill you get a refund or owe?Self-Employment Tax Calculator1099 tax and quarterly estimates

EverydayTips, tax, discounts, dates

Sales Tax CalculatorAdd or back out sales taxTip CalculatorTip and split the billPercentage CalculatorPercent of, percent changeDiscount CalculatorSale price after % offUnit Converterlb↔kg, °F↔°C, ft↔mGas Cost CalculatorTrip fuel cost from MPG

Health & TimeBMI, calories, dates, hours

Age CalculatorExact age and next birthdayDate CalculatorDays between dates, add daysHours Worked CalculatorWeekly time card and payBMI CalculatorBody mass index and healthy rangeCalorie CalculatorDaily calories to maintain weightPregnancy Due Date CalculatorDue date, week, trimester

Why Plainsum?

Every calculator shows how the answer was worked out, explains the formula in plain English, and runs entirely on your device. There are no sign-ups and no stored data.