Calculator

Math, dates, health and utility calculators in one workspace.

Generate random numbers within a range, optionally unique.

Calculate exact age in years, months and days from a birth date.

Calculate the time between two dates.

Calculate Body Mass Index in metric or imperial units.

Work out percentages, increases, decreases and ratios.

Calculate dimensions that keep an aspect ratio.

Check if a number is prime and list its factors.

Find the greatest common divisor and least common multiple.

Find the best times to wake up or go to sleep.

Convert between pace, speed, distance and time.

Estimate trip fuel cost from distance, consumption and price.

Compute n! for any non-negative integer.

Generate a Fibonacci number sequence.

Compute mean and standard deviation.

Basic statistics from a number list.

Solve ax² + bx + c = 0.

Calculate percent change between two values.

Solve proportions like 3:4 = 6:x.

Roll virtual dice with custom sides.

Flip a virtual coin one or many times.

Pick random unique lottery numbers.

Add or subtract days from a date.

Get ISO week number for a date.

Count days until a target date.

Count weekdays between two dates.

Simple browser stopwatch with lap times.

25/5 minute focus timer with alerts.

Break a number into prime factors.

Calculate binomial combinations.

Calculate ordered permutations.

Estimate basal metabolic rate (Mifflin-St Jeor).

Daily water intake from body weight.

Split a bill with tip among people.

Great-circle distance between coordinates.

Estimate download duration from file size and speed.