The Internet's Number Toolbox

Numbers made simple.

Life is complicated. Numbers don't have to be.

Useful by design

Start with a number.

Fast tools that work locally in your browser. No account. No uploaded inputs.

Everyday number questions, answered clearly.

Calculate a percentage of a number, find what percent one number is of another, or measure percentage increase and decrease.

Plan dates, measure intervals, and understand age.

Calculate your exact age on any date in years, months, days, total days, and complete weeks using calendar-date math.

Add or subtract years, months, and days from a calendar date and see the resulting date and day of the week.

Count calendar days, complete weeks, calendar years and months, and weekdays between any two dates.

Practical gross-pay and bill calculations.

Calculate a tip, total bill, and per-person split with common tip shortcuts and clear currency formatting.

Convert gross pay between hourly, daily, weekly, biweekly, monthly, and annual periods using adjustable work-schedule assumptions.

Move accurately between common measurement systems.

Convert length, mass, temperature, area, volume, and speed units with clearly labeled US, imperial, and metric definitions.

Create random, secure, and scannable results locally.

Generate one or up to 1,000 secure random integers in an inclusive range, with optional no-repeat results.

Generate a strong random password locally with Web Crypto, adjustable length, character groups, and ambiguous-character exclusion.

Create a downloadable PNG or SVG QR code locally, with templates, colors, size, and error-correction controls.