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Rem to Millimeter
Convert Rem to Millimeter and get the exact value instantly.
1 rem = 4.233333333 mm
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About this conversion
To convert Rem to Millimeter, multiply the number of Rem by 4.233333333.
Typographic units mix web pixels with print measures — points, picas, ems and rems — and these conversions assume a 96 dpi screen with a 16px root font (the CSS default), so 1 inch = 96px and 1rem = 16px.
Conversion table
| Rem (rem) | Millimeter (mm) |
|---|---|
| 1 rem | 4.233333333 mm |
| 2 rem | 8.466666667 mm |
| 5 rem | 21.16666667 mm |
| 10 rem | 42.33333333 mm |
| 100 rem | 423.3333333 mm |
How to use this converter
- Enter your Rem value
Type any number into the Rem field. It starts at 1 so you can read the rate straight away.
- Read the Millimeter result
The amount in Millimeter updates as you type, so there is no button to press and nothing to wait for.
- Swap or keep exploring
Use the swap control to flip the direction, or pick a related conversion from the list below.
Frequently asked
- How many Millimeter are in one Rem?
- One Rem equals 4.233333333 mm. Enter any amount above to get an exact figure for your own value.
- Is this converter accurate?
- Yes. It uses the exact international definition of each unit and computes on your device, so the only rounding is for display.
- Do you upload the numbers I enter?
- No. The Rem to Millimeter conversion runs entirely in your browser tab, and nothing you type is sent to a server.
- Does it work on my phone?
- Yes. It runs in any modern mobile browser and keeps working offline once the page has loaded.
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