Everyday Toolkit — Free Timers, Converters & Calculators

Small calculations. A little less friction.

Everyday Toolkit brings browser timers, a stopwatch, unit conversion and everyday calculators into one place. Work out percentages and dates, split a bill, scale a recipe or compare time zones. Choose the helper for the task rather than searching through a collection of unrelated pages.

Open Everyday Toolkit ↗

Free to start in your browser. The interactive tool uses JavaScript.

Try a small experiment.

Pick a tool from the opening list. For conversions, choose both the starting and destination units before entering a value.
For a percentage or date calculation, check that the question matches the operation you selected.
Use named timers or focus cycles for a short work session. Keep the page available and check your browser’s sound behavior.

A couple of useful questions.

Why should I check the units before comparing results?

A number alone does not specify a physical quantity. Converting between units changes the numerical value while describing the same amount. Check that you are comparing the same quantity as well as the same units.

Will a browser timer always make a sound in the background?

Browser, device and sound settings can restrict background activity or audio. Try a short test on your device before relying on an audible alert, and keep an important deadline in an appropriate reminder system.

Know what the tool represents.

Check inputs, units, dates and rounding before using a result. These helpers are for everyday planning and arithmetic; they do not replace specialist calculations when a decision needs additional assumptions or precision.

FOLLOW ANOTHER THREAD

Related tools to explore.

Guide v1.0.0 · Updated November 1, 2026. Controls can evolve; the tool’s own changelog and model notes describe its current behavior.