The toolkit

Calculators

Fast answers for everyday number questions.

A tool for the task

3 toolsBuilt to be useful. Free to use.

Calculate age in calendar years, months, and days. Choose a date of birth and a reference date, with a clear breakdown and no upload.

Free percentage calculator for discounts, tips, exam scores, and growth rates. Solve “X% of Y”, percentage change, and reverse percentages instantly.

Simplify an image aspect ratio and calculate proportional dimensions.