🧰 Everyday Tools

13 practical tools.

Convert common length, weight, and temperature units.

Calculate age in years, months, and days from a birth date.

Calculate the number of days and weeks between two dates.

Calculate body mass index from height and weight.

Calculate pace, speed, or finish time for a distance.

Estimate fuel required and trip cost.

Generate random integers within a selected range.

Scale width and height while preserving aspect ratio.

Calculate elapsed time between two clock times.

Suggest wake times based on approximate 90-minute sleep cycles.

Estimate a basic daily water target from body weight.

Estimate calories burned using MET, body weight, and duration.

Estimate body-fat percentage using the U.S. Navy circumference method.