Everyday Calculators

Count calendar days, weeks, weekdays and weekends between two dates — for deadlines, leases and projects.

Cost of a journey from distance, fuel efficiency and fuel price — works in MPG or L/100km, any currency.

Convert between metric and imperial length units — mm, cm, m, km, inches, feet, yards, miles — instantly.

Generate a random number in a range, or get the probability-fair way to pick among options — for unbiased choices.

Convert between cups, tablespoons, teaspoons, milliliters and fluid ounces — and scale a recipe up or down.

Convert between Celsius, Fahrenheit and Kelvin instantly — with the exact formulas and key reference points.

Convert between kilograms, grams, pounds, ounces, stones and metric tonnes — metric and imperial mass units.

Solve for any one of speed, distance or time given the other two — in km/h, mph or m/s, for trips and pacing.

Hours and minutes between two clock times — for timesheets, shifts and billing, with decimal-hours output.