Welcome to UnitConversion.io

Welcome to UnitConversion.io. This website was made to be the best unit conversion website on the internet. The way that I hope to achieve this is to make the pages extremely fast and responsive. As you will see below, there are many unit types and an extensive unit list to choose from, which differentiates UnitConversion.io from other similar sites. Our aim is to be a destination for students, professionals, and everyone in between for converting units quickly and in a well presented format. I hope you enjoy the site, and contact me if you have any feedback!

Blog

Mac Printer Setup Guide: Connect Any Printer in Minutes

May 21st, 2026
Setting up a printer on a Mac should not feel like teaching a cat to do taxes. Good news. It is usually quick. Your Mac is smart. Your printer is probably ready to be friends. You just need the right path. TLDR: Turn on your printer. Connect it to Wi Fi, USB, or your netw... Read more


Slow PC Fix Guide: Speed Up Your Computer in Minutes

May 21st, 2026
Your PC should feel like a race car, not a sleepy turtle in a sweater. If your computer takes forever to start, freezes at the worst time, or sounds like a tiny jet engine, do not panic. Most slow PC problems are simple to fix. You can speed things up in minutes with a few smart moves. ... Read more


How to Use Apple Watch Health Features to Track Fitness

May 21st, 2026
The Apple Watch has evolved from a stylish wearable into one of the most useful everyday fitness companions you can own. Whether you are trying to walk more, train for a race, improve your sleep, monitor your heart health, or simply understand your body better, its built-in health features can tu... Read more


Evernote Tutorial: Organize Notes and Boost Productivity in 2026

May 21st, 2026
Evernote remains one of the most practical tools for capturing information, organizing work, and turning scattered ideas into usable action. In 2026, the key to getting real value from Evernote is not simply saving more notes; it is building a reliable system that helps you find, review, and use ... Read more



Unit Conversion



mm

=

cm

Unit Types

Length

Convert units of length. Examples of such units are meters and miles.

Length Conversion

Area

Convert units of area. Examples of such units are hectare and acres.

Area Conversion

Mass

Convert units of mass. Examples of such units are ounces and tonne.

Mass Conversion

Volume

Convert units of volume. Examples of such units are millimeters cubed and kilometers cubed.

Volume Conversion

Temperature

Convert units of temperature. Examples of such units are fahrenheit and kelvin.

Temperature Conversion

Time

Convert units of time. Examples of such units are days and weeks.

Time Conversion

Speed

Convert units of speed. Examples of such units are meters per second and knots.

Speed Conversion

Pressure

Convert units of pressure. Examples of such units are pascal and kilopascals.

Pressure Conversion

Digital

Convert units of digital. Examples of such units are kilobytes and gigabytes.

Digital Conversion

Parts Per

Convert units of parts per. Examples of such units are parts-per-million and parts-per-quadrillion.

Parts Per Conversion

Voltage

Convert units of voltage. Examples of such units are volts and kilovolts.

Voltage Conversion

Current

Convert units of current. Examples of such units are milliamps and kiloamps.

Current Conversion

Power

Convert units of power. Examples of such units are kilowatts and megawatts.

Power Conversion

Energy

Convert units of energy. Examples of such units are watt hours and kilojoules.

Energy Conversion

Volume Flow Rate

Convert units of volume flow rate. Examples of such units are millimeters cubed per second and inches cubed per second.

Volume Flow Rate Conversion

Frequency

Convert units of frequency. Examples of such units are gigahertz and terahertz.

Frequency Conversion

Pace

Convert units of pace. Examples of such units are minutes per kilometer and seconds per foot.

Pace Conversion

Illuminance

Convert units of illuminance. Examples of such units are lux and foot-candles.

Illuminance Conversion

Reactive Power

Convert units of reactive power. Examples of such units are mvar and gvar.

Reactive Power Conversion

Angle

Convert units of angle. Examples of such units are degrees and radians.

Angle Conversion