Calculator Tools

Percentage, age, BMI, scientific, statistics and more — fast, accurate, ad-free calculators.

12 tools 100% client-side

Three common percentage calculations — instant & private.

Your exact age in years, months & days — plus a birthday countdown.

Body Mass Index with metric or imperial units & category color coding.

A real working calculator: functions, constants, memory & percent.

Days, weeks, months & years between two dates — instant.

Compute your grade point average on a 4.0 scale, weighted by credits.

Mean, median, mode, std deviation & more from a list of numbers.

Daily calorie needs for maintenance, loss and gain — Mifflin-St Jeor.

Solve the missing side of a ratio, or simplify it with GCD.

Estimate your fertile window, ovulation date, next period & due date.

Estimate fuel used and trip cost from distance, efficiency and price.

Solve speed, distance or time from the other two — km/h, m/s, mph.