Calculators tools

Units, dates, percentages, loans and more. 11 tools, all private and free.

Days between dates, add or subtract time, age and business days.

Monthly payment, total interest and a full amortization schedule.

X% of Y, what percent, percentage change, increase and decrease.

Compare a date and time across cities and time zones.

Length, weight, temperature, volume, speed, data size and more.

See how savings and investments grow with regular contributions.

Binary, octal, decimal, hex and any base from 2 to 36.

Spell out numbers in English, up to the quintillions.

Factor numbers into primes, and find the GCD and LCM.

Convert numbers to Roman numerals and back (1–3999).

Work out the tip and split the bill between friends.

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