Convert anything, instantly.
A fast, minimal unit converter for everyday measurements — length, weight, temperature and more. Accurate results in your browser, with no sign-up required.
1 mm = 0.1 cm
How to use the converter
Three quick steps stand between you and an accurate answer — no formulas to remember and no calculator required.
- 1
Pick a category
Choose one of the eight conversion categories above — length, weight, temperature, volume, area, speed, digital storage, or time.
- 2
Enter your value
Type the number you want to convert, then select the unit you are converting from and the unit you want to convert to.
- 3
Read your result
The converted value appears instantly. Use the swap button to reverse the direction, or copy the result to paste it anywhere.
Conversion categories explained
Trusted Unit Converter covers the eight measurement categories people reach for most. Here is what each one does and when you might need it.
Length & Distance
Convert between metric and imperial distance units — millimeters, centimeters, meters, kilometers, inches, feet, yards, miles, and nautical miles. Useful for construction measurements, mapping distances, fabric and material sizing, and comparing road signs when traveling between countries that use different systems.
Weight & Mass
Switch between milligrams, grams, kilograms, metric tons, ounces, pounds, and stone. Ideal for cooking and baking recipes written in a different system, weighing luggage before a flight, calculating postage, and tracking fitness or nutrition goals across unit standards.
Temperature
Convert Celsius, Fahrenheit, and Kelvin. Temperature uses offset-based formulas rather than simple multiplication, so this category handles the math for you — perfect for setting an oven, reading a foreign weather forecast, or working through science and engineering problems.
Volume & Capacity
Translate between milliliters, liters, cubic meters, teaspoons, tablespoons, cups, pints, quarts, and gallons. A staple for the kitchen, for mixing liquids in a lab, and for comparing fuel or container capacities between metric and US customary units.
Area
Convert square meters, square kilometers, square feet, square miles, hectares, and acres. Helpful for real estate and property listings, agriculture and land management, flooring and painting estimates, and understanding the size of parks, plots, or countries.
Speed & Velocity
Compare meters per second, kilometers per hour, miles per hour, and knots. Handy for reading speed limits abroad, interpreting weather and wind reports, aviation and boating, and comparing athletic or vehicle performance figures.
Digital Storage
Convert bits, bytes, kilobytes, megabytes, gigabytes, and terabytes using decimal (SI) prefixes. Useful when sizing files, estimating download times, comparing storage devices, and reading network bandwidth or disk capacity specifications.
Time
Convert milliseconds, seconds, minutes, hours, days, weeks, and years. Helpful for scheduling, calculating durations, working with timestamps in code, planning projects, and understanding time spans across very small or very large scales.
Fast & lightweight
Conversions happen instantly in your browser. No page reloads, no waiting, and no account to create.
Everyday accuracy
Precise, internationally established factors for metric and imperial units, so you can trust every result.
Works everywhere
Fully responsive and free — use it on your phone, tablet, or desktop, anytime, with no installation.
Popular conversions
Trusted Unit Converter covers the measurement units people search for most — quick answers to everyday questions.
Frequently asked questions
Everything you might want to know about using Trusted Unit Converter.
Is Trusted Unit Converter free to use?+
Yes. Every category and every unit is completely free. There is no account, no paywall, and no premium tier — you can use the full converter as often as you like.
Do I need to install anything or sign up?+
No. The converter runs entirely in your web browser on any device. There is nothing to download and no registration required. Just open the page, type a value, and read your result.
How accurate are the conversions?+
Length, weight, volume, area, speed, storage, and time use precise, internationally established conversion factors. Temperature uses the exact offset formulas between Celsius, Fahrenheit, and Kelvin. For critical scientific, medical, legal, or engineering work, we still recommend verifying against an authoritative source.
Does the converter work offline?+
Once the page has loaded, conversions are calculated locally in your browser, so they respond instantly without contacting a server. A live internet connection is only needed to load the page itself.
Which units are supported?+
Eight categories are covered: length, weight, temperature, volume, area, speed, digital storage, and time. Each category includes the most common metric and imperial units, plus a few specialized ones such as nautical miles, stone, and knots.
Can I use the results for commercial purposes?+
Yes. You may use Trusted Unit Converter for personal, educational, and commercial purposes. See our Terms of Use for the full details.
Leave your reviews
See how Trusted Unit Converter works for other people, and share your own experience — no sign-up required.
Read what students, cooks, travelers, and professionals think of Trusted Unit Converter, and leave your own rating on the reviews page.
Browse all reviews →Learn how conversions work
Original guides to metric and imperial systems, temperature scales, cooking measurements, and the math behind every result.