Calculators

Percentages, unit conversions, dates and everyday math made simple.

Solve everyday percentage problems in seconds.

Convert length, weight, volume and temperature units.

Find an exact age in years, months and days.

Check your Body Mass Index in metric or imperial.

Estimate monthly payments, total interest and cost.

Convert numbers to Roman numerals and back, both ways.

Work out the tip, total and split per person in seconds.

More about calculators

Calculators on Outilo are free, fast and run in your browser. Pick a tool above to get started — no signup, no uploads, no limits.