Unit converter
Or paste a whole page of text
This is the extension's own converter running in your browser. Paste a recipe, a product page or car specs — every unit gets converted. Hover a highlight to see the original.
Nothing you paste leaves your browser.
What it looks like on real websites
With the extension, this happens on every page automatically.
What it converts
Length & distance
Inches, feet (5′9″), yards, miles ⇄ cm, m, km — including sizes like 77 × 147 cm.
Weight & cooking
lb, oz, stone ⇄ kg, g. Cups, fl oz, gallons ⇄ ml, liters.
Temperature & speed
°F ⇄ °C, mph ⇄ km/h, mpg ⇄ L/100 km.
Cars, area, sizes
hp ⇄ kW, lb-ft ⇄ N·m, sq ft and acres ⇄ m² and hectares, approximate shoe & clothing sizes (±).
How it works
- Add to Chrome
One click from the Chrome Web Store. No account. - Pick your system
Metric, US imperial or UK — or choose units one by one. - Just browse
Units are converted in place and highlighted. Hover to see the original.
Popular conversions
Quick reference for the conversions people look up most. With ExactUnits these happen automatically on every page.
Centimeters to inches
1 cm ≈ 0.3937007874 in · 10 cm ≈ 3.937007874 in · 30 cm ≈ 11.811023622 in
Millimeters to inches
5 mm ≈ 0.1968503937 in · 10 mm ≈ 0.3937007874 in · 50 mm ≈ 1.968503937 in
Kilograms to pounds
1 kg ≈ 2.2046226218 lb · 50 kg ≈ 110.2311310924 lb · 70 kg ≈ 154.3235835294 lb
Pounds to kilograms
1 lb = 0.45359237 kg · 150 lb = 68.0388555 kg · 200 lb = 90.718474 kg
Fahrenheit to Celsius
32 °F = 0 °C · 70 °F ≈ 21.1111111111 °C · 350 °F ≈ 176.6666666667 °C
Celsius to Fahrenheit
20 °C = 68 °F · 37 °C = 98.6 °F · 200 °C = 392 °F
Feet to meters
1 ft = 0.3048 m · 6 ft = 1.8288 m · 10 ft = 3.048 m
Miles to kilometers
1 mi = 1.609344 km · 5 mi = 8.04672 km · 26.2 mi = 42.1648128 km
US cups to milliliters
1 cup = 236.5882365 ml · 0.5 cup = 118.29411825 ml · 2 cup = 473.176473 ml
Questions
Is ExactUnits free?
Yes. ExactUnits is free to install and use, with no sign-up. During beta everything is unlimited; after beta the free plan keeps a daily number of automatic conversions, and the popup converter stays free forever. Pro is optional.
Does it read or send the pages I visit?
No. Everything is converted locally in your browser. ExactUnits never sends the addresses or the text of the pages you visit anywhere. See the privacy policy.
How much is Pro?
During beta: $5 once for lifetime Pro (until January 31, 2027). After beta: $10/year or $25 once. See pricing.
How do I convert metric to imperial on a website?
Install ExactUnits and choose “Imperial (US)” in the popup. Centimeters, kilograms, liters and °C on any page turn into inches, pounds, quarts and °F automatically. To convert a single value, use the quick converter in the toolbar or paste text into the converter above.
Does it handle feet and inches like 5′9″?
Yes. Heights like 5′9″ or 5 ft 9 in, ranges like 10–12 lbs and sizes like 77 × 147 cm are recognized and converted as a whole.
Will it convert years, prices or dates by mistake?
It's built to skip years, ordinals like “21st”, coordinates and values that already show both units. If you spot a wrong conversion, use “Feedback” in the extension menu and we'll fix it.
Does it work offline and in other Chromium browsers?
Conversion works offline. ExactUnits is made for Google Chrome and also runs in Chromium-based browsers that install from the Chrome Web Store, such as Microsoft Edge, Brave and Opera.
