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Calculate percent of a number, what percent one value is of another, and percent change with clear formulas, examples, domains, and interpretation.

Calculate adult body mass index from metric or imperial inputs, see the exact formula, CDC category cut points, healthy-weight range math, and limitations.

Estimate a fixed-rate mortgage payment with principal, interest, taxes, insurance, HOA dues, PMI, extra payments, payoff time, and total interest.

Calculate gratuity, total bill, and per-person split from a bill amount, tip percentage, and party size for restaurants, delivery, salons, rides, and other service bills.

Calculate sale price and savings from an original price and advertised percent-off discount, with clear formulas for markdowns, stacked deals, tax, and final cost.

Estimate the monthly payment, total interest, total paid, and payment count for a fixed-rate amortized loan.

Estimate U.S. point-of-sale sales tax from a pre-tax price and combined state and local rate, with tax amount, subtotal, and final receipt total.

Calculate future value from a starting balance, annual rate, years, monthly contributions, and compounding frequency, with interest earned separated from total deposits.

Estimate maintenance calories, BMR, and simple loss or gain targets using the Mifflin-St Jeor equation and selected activity factor.

Calculate exact age in years, months, and days from a birth date to any age-at date, plus total months, weeks, days, weekday born, and next birthday.

Convert gross pay across hourly, daily, weekly, biweekly, semi-monthly, monthly, quarterly, and yearly frequencies, with adjusted views for holidays and vacation days.

Convert a duration from seconds, minutes, hours, days, weeks, average months, or average years into the full supported time table, with exact factors and calendar caveats.