Math Tools

Calculate increase or decrease percentages for prices, traffic, sales, grades, and before-versus-after comparisons.

Calculate circle diameter, circumference, and area from a given radius.

Format numbers for dashboards, pricing, reports, finance, localization, and user interfaces.

Convert integers between common number bases and review the result in binary, octal, decimal, hex, and more.

Calculate reduced aspect ratios and matching sizes for responsive images, displays, video frames, and design layouts.

Calculate with fractions online and review the simplified result as a fraction, decimal, and percent.

Paste values to get fast summary stats without touching spreadsheet formulas.

Work out simple percentages, changes, and comparisons without opening a spreadsheet.