Calculators tools

Focused calculators for common calculations.

Calculate age in years, months, days, and total days between two dates.

Calculate, simplify, and resize dimensions while preserving an aspect ratio.

Check HEX color contrast against WCAG AA and AAA requirements.

Calculate data size, transfer speed, or time with explicit bits and bytes.

Calculate the exact difference between two calendar dates in days, weeks, and months.

Calculate percentages, proportions, and percentage changes instantly.

Calculate percentage increase or decrease and the absolute difference.

Generate secure random integers or decimals within a custom range.

Simplify a general ratio, compare its decimal value, and scale it to a target.

Solve the simple proportional relationship A : B = C : X.

Calculate screen pixel density, total pixels, and pixel pitch from resolution and size.

Calculate hours, minutes, and seconds between two times, including overnight spans.

Convert a date and time between IANA time zones with daylight-saving support.