Unit Converter

About the Unit Converter

Unit Converter handles everyday unit swaps — kilometres to miles, Celsius to Fahrenheit, litres to gallons, kg to lb — with double-sided inputs so you can type in either side.

How to use

1. Pick the category (length, weight, temperature, volume, speed).
2. Type a value in either input; the other updates instantly.
3. Swap categories without losing your number.

Benefits & key features

• Five most-used categories in one minimal interface.
• Bidirectional inputs — no 'from / to' guesswork.
• No currency conversions (rates change hourly, so we don't pretend).
• Works without an internet connection after first load.

Pro tip

Temperature conversions use the exact formulas (°F = °C × 9/5 + 32) rather than rounded lookup tables.

Why choose toolsfy for Calculators tools?

A good calculator should give you a defensible number you can paste into a spreadsheet, not a vague range behind a paywall. toolsfy's calculators show every formula, every step and every input so you can trust the result — and cross-check it. Because the math runs in your browser, there is no latency, no rate limit, and no risk of a server returning a cached, stale, or rounded answer.

Common use cases

• Engineering students verifying textbook answers on the bus, without burning mobile data on a heavyweight scientific-calculator app.
• Freelancers converting between units in client briefs — millimetres to inches, pounds to kilograms, US fluid ounces to millilitres — in seconds.
• Shopkeepers calculating the effective percentage change in margins after a supplier price hike, without firing up Excel on a point-of-sale tablet.

Frequently asked questions