Calculator Tools

Free online calculators for unit conversion, percentages, dates, loans, and more.

Convert length, weight, and temperature. m↔ft, kg↔lb, °C↔°F.

Evaluate math expressions. Type 100*1.1 or (10+20)/3 and get the result.

Convert between Arabic numbers and Roman numerals (I, V, X, L, C, D, M).

Calculate percentages. What is X% of Y? What percent is A of B?

Calculate age from birth date. Years, months, days, and total days.

Find when you'll have lived for a repdigit number of days (e.g., 7777, 11111).

Generate random numbers between min and max. Cryptographically secure.

Calculate BMI from height and weight. Japanese standard categories.

Calculate days between two dates. Simple date difference calculator.

Add or subtract days from a date. Calculate future or past dates.

Calculate discount price and savings.

Calculate tips based on bill amount and percentage.

Split a bill evenly among people. Optionally include tip.

Calculate monthly loan payments.

Calculate compound interest over time.

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