Web tool · Next.js
QuickUnitSwap
A unit converter that answers as you type, with the common pairs one tap away.
Common pairings sit above the converter. Pick miles to kilometres and a marathon comes out at 42.1648 km as you type.
Who it is for
For students, tradespeople and anyone who converts units often enough to be tired of ad-heavy converter sites. No sign-up and no ads.
How it works
02
Fifteen categories down the side, from length and temperature to data storage and fuel economy. 180 °C is 356 °F.
quickunitswap.com
03
Beyond conversion, formula calculators — here heat energy from mass, specific heat and temperature change, with the formula shown.
quickunitswap.com
On a phone
On a phone the fifteen categories fold into a menu at the top, and the converter stacks from and to.
How it is built
Next.js 15 and Tailwind v4, with a command palette that jumps to any unit or formula.
Next.js 15 · Tailwind v4 · TypeScript