Is the Unit Converter free?

Yes — the Unit Converter is completely free, with no account, subscription, signup, or usage limits.

Is my data uploaded or stored?

No. The Unit Converter processes everything locally in your browser. Your input is never uploaded, saved, or shared with any server.

Does the Unit Converter work offline?

Yes. Once the page has finished loading, the Unit Converter works without an internet connection.

Which browsers does the Unit Converter work in?

The Unit Converter works in all modern browsers, including Chrome, Firefox, Safari, and Edge — no plugins or extensions needed.

Can I see all unit conversions at once?

Yes — the All Conversions table below the main converter shows your input value converted into every unit in the current category simultaneously.

Unit Converter

Convert between length, weight, temperature, area, volume, and speed units.

From

Millimetre (mm)

0.1

Centimetre (cm)

1 mm = 0.1 cm

All Conversions for 1 mm

Centimetre	cm	0.1
Metre	m	0.001
Kilometre	km	0.000001
Inch	in	0.03937007874
Foot	ft	0.003280839895
Yard	yd	0.001093613298
Mile	mi	6.213712e-7
Nautical Mile	nmi	5.399568e-7
Micrometre	μm	1000
Nanometre	nm	1000000
Light Year	ly	1.056971e-19

Free browser-based tool · Runs 100% on your device · Last updated July 7, 2026

What is the Unit Converter?

The free Unit Converter on Acken Tools is an all-in-one measurement conversion hub that handles every major unit category in a single place. Switch between Length, Weight, Temperature, Volume, Speed, Area, Time, Pressure, Energy, and Data Storage using the category tabs at the top of the tool. Within each category, choose your source unit from the From dropdown, enter a value, and instantly see the converted result in the To dropdown — plus a full All Conversions table showing every unit at once. Everything runs 100% in your browser with no sign-up required.

→ Students converting units for physics, chemistry, or math homework
→ Engineers switching between metric and imperial measurement systems
→ Developers calculating data-size thresholds or network speeds
→ Travellers converting temperatures, distances, and volumes abroad
→ Chefs converting recipe measurements between systems

How to Use the Unit Converter

1 Click the category tab for the unit type you need (e.g. Length, Weight).
2 Select your source unit from the From dropdown.
3 Type your value into the number input field.
4 Choose a target unit from the To dropdown to see the instant result.
5 Click the ⇄ Swap button to reverse the conversion direction.
6 Scroll down to the All Conversions table to see your value in every available unit.

Key Features

📐
10 unit categories in one free tool

Length, Weight, Temperature, Volume, Speed, Area, Time, Pressure, Energy, and Data Storage — no switching pages.
⚡
Instant real-time conversion

Results update on every keystroke — no button press required.
⇄
Swap button

Instantly reverse the From ↔ To direction with a single click.
📊
All Conversions table

Shows your value in every unit of the selected category simultaneously.
🔒
100% browser-based

Works offline after first load — your data never leaves your device.

Example Usage

Example Input

Category: Length · From: km · Value: 5 · To: mi

Example Output

5 km = 3.10686 mi

Frequently Asked Questions about the Unit Converter

What is the Unit Converter?: The Unit Converter is a free online tool that lets you convert between length, weight, temperature, area, volume, and speed units. It runs entirely in your browser, so there is nothing to install and nothing is uploaded to a server.
Is the Unit Converter free?: Yes — the Unit Converter is completely free, with no account, subscription, signup, or usage limits.
Is my data uploaded or stored?: No. The Unit Converter processes everything locally in your browser. Your input is never uploaded, saved, or shared with any server.
Does the Unit Converter work offline?: Yes. Once the page has finished loading, the Unit Converter works without an internet connection.
Which browsers does the Unit Converter work in?: The Unit Converter works in all modern browsers, including Chrome, Firefox, Safari, and Edge — no plugins or extensions needed.
How many unit categories does this free converter support?: It covers 10 categories: Length, Weight, Temperature, Volume, Speed, Area, Time, Pressure, Energy, and Data Storage — each with a full set of units.
Can I see all unit conversions at once?: Yes — the <strong>All Conversions</strong> table below the main converter shows your input value converted into every unit in the current category simultaneously.