All calculators

Every tool, grouped by what it is for.

Finance

FinancePaycheck (take-home pay)Net pay after federal tax, Social Security, and Medicare.Open →Finance2026 Tax BracketsYour 2026 federal tax bracket, marginal vs effective rate, and total tax.Open →FinanceCompound interestGrow a balance with monthly contributions over time.Open →FinanceSimple interestInterest on a principal with no compounding.Open →Finance401(k)Project your 401(k) balance with employer match.Open →Finance2026 Contribution LimitsYour 2026 401(k) and IRA limits, with catch-up and Roth phase-out.Open →FinanceRoth vs Traditional IRACompare the after-tax value of each at retirement, for your tax rate now vs later.Open →FinanceRetirement (FIRE)When your savings can replace your salary.Open →FinanceSavings goalHow much to set aside each month to hit a target.Open →FinanceROIReturn on investment as a percentage and profit.Open →FinanceInflationHow inflation changes buying power over time.Open →FinanceRule of 72Estimate how long an investment takes to double.Open →FinanceLoan repaymentMonthly payment and total interest on any loan.Open →FinanceCar loanMonthly payment on an auto loan, with trade-in and tax.Open →FinanceAmortization scheduleMonth-by-month payment breakdown and payoff date.Open →FinanceMortgagePayment, amortization, and payoff timeline.Open →FinanceHome affordabilityHow much house you can afford, by the 28/36 rule.Open →FinanceRent vs buyCompare the total cost of renting and owning, with the break-even year.Open →FinanceRefinanceBreak-even point and savings from refinancing.Open →FinanceCredit card payoffHow long to clear a card balance and the interest cost.Open →FinanceDebt snowball vs avalancheCompare paying smallest-balance vs highest-APR first: months to debt-free and interest saved.Open →FinanceSales taxAdd sales tax to a price to get the final total.Open →FinanceReverse sales taxWork out the price before tax from a total.Open →FinanceMarkupSet a price from cost and a markup percentage.Open →FinanceProfit marginMargin and markup from cost and selling price.Open →

Work

WorkHourly to salaryConvert a wage to weekly, monthly, and yearly pay.Open →WorkSalary to hourlyConvert a yearly salary to an hourly wage.Open →

Everyday

EverydayTipSplit a bill and tip fairly between any number of people.Open →EverydayDiscountFind the sale price and how much you save.Open →EverydayStacked discountCombine two or three discounts into one price.Open →EverydayPercentageIncrease, decrease, and difference, instantly.Open →EverydayUnit priceCompare two sizes to find the better deal.Open →EverydayDate differenceDays, weeks, and months between two dates.Open →EverydayAgeYour exact age in years, months, and days.Open →

Health

HealthBMIBody mass index with a healthy-range guide.Open →HealthCalorie (BMR)Daily calories to maintain weight, from BMR and activity.Open →HealthMacroDaily calories split into protein, fat, and carbs.Open →HealthBody fatBody fat percentage with the U.S. Navy method.Open →