Everyday Calculators

These tools are designed for quick daily planning, conversions, and personal calculations across health, time, and measurement tasks.

Find percentages and percentage differences fast.

Calculate age from a birth date in seconds.

Find the gap between two dates in days.

Count the number of days between two calendar dates.

Add or subtract time durations.

Estimate body mass index from height and weight.

Estimate daily calorie needs for planning.

Convert between common measurement units.

Convert speed between metric and imperial units.

Convert temperatures between Celsius, Fahrenheit, and Kelvin.