Free Unit Converter — length, weight, temperature, and more

Convert between any common units: length, weight, temperature, volume, area, speed, data size, time. All in one browser app. Ad-free.

Launch the tool
freeunitconvert.app
Open Unit Converter →

Features

How it works

  1. Open freeunitconvert.app
  2. Pick a category (length, weight, etc.)
  3. Enter a value and source unit
  4. See conversion to all target units instantly

Common use cases

How it compares

UnitConverters.net covers many specialized units but has ads. ConvertUnits.com similar. Google's built-in converter works for simple cases. Freeunitconvert covers the common 95% without ads.

Privacy

Conversions are arithmetic — no network calls.

Frequently asked questions

Is Freeunitconvert free?

Yes. Ad-free, no signup.

Which categories are supported?

Length, weight/mass, temperature, volume, area, speed, data size, time, pressure, energy, and more.

Does it handle temperature conversion correctly?

Yes. Temperature uses additive offset (not just multiplication), so Celsius to Fahrenheit converts correctly (e.g., 0°C = 32°F).

Does it support historical or niche units?

Common units are covered. For very specialized units, dedicated scientific tools may be better.

Does it work offline?

Yes. PWA-installable and fully offline after first load.

Can I convert currency?

Not currently. Currency conversion requires real-time rate data and is out of scope for a client-side tool.