About Time Percentage Calculator

We help you express durations as percentages without spreadsheet friction.

Time Percentage Calculator started from a simple planning question: how much of my available window did this task actually take? Percentages make that answer easy to share, but unit mistakes make them easy to misread.

We publish the formula beside the tool, keep the layout mobile-first, and run every calculation locally in your browser so your schedule data stays on your device.

Transparent formula on every page
No account required
Explorer-style design built for quick orientation