Formula and method
The em To rem Converter converts values between EM (em) and Root EM (rem).
Conversion factor: 1 EM (em) = 1 Root EM (rem).
Typography and screen CSS conversions convert screen display units (pixels, points, rem, em) for web design and desktop publishing.
Examples
- Convert em to rem instantly.
- Swap units or choose another unit from the same group.
- Example: 1 em converts to 1 rem.
- CSS typography uses px (device-independent pixels, 96/inch), rem (root-relative: 1rem = 16px by default), em (parent-relative), pt (print points: 1pt = 4/3 px at 96dpi), and % (percentage of parent). Rem is preferred for accessibility because it scales with user browser font-size preferences.
Understanding EM to Root EM Conversion
Converting values from EM (em) to Root EM (rem) is a unit transformation in the typography measurement system. 1 EM (em) equals exactly 1 Root EM (rem).
When this conversion matters: CSS typography uses px (device-independent pixels, 96/inch), rem (root-relative: 1rem = 16px by default), em (parent-relative), pt (print points: 1pt = 4/3 px at 96dpi), and % (percentage of parent). Rem is preferred for accessibility because it scales with user browser font-size preferences.
Precision & standards: Typography and screen CSS conversions convert screen display units (pixels, points, rem, em) for web design and desktop publishing. SpecWhale uses official SI and imperial conversion factors, computed with 64-bit IEEE 754 floating-point arithmetic entirely in your browser — no data is sent to any external server.
em To rem Converter quick reference table
Common em amounts converted to rem, generated from the exact formula above so every row matches the live calculator.
| em | rem |
|---|---|
| 1 em | 1 rem |
| 2 em | 2 rem |
| 5 em | 5 rem |
| 10 em | 10 rem |
| 25 em | 25 rem |
| 50 em | 50 rem |
| 100 em | 100 rem |
| 500 em | 500 rem |
| 1,000 em | 1,000 rem |
Convert em to other units
- rem To em Converter -- the reverse direction of this page.
- em To px Converter
- em To pt Converter
- em To pc Converter
- em To % Converter
- em To css-in Converter
- em To css-mm Converter
Embed this tool
Paste this snippet into your own site or blog post to embed a live, working copy of this tool. It links back to the full page on CalcuSpec.
Frequently asked questions
How do I convert em to rem with em To rem Converter?
To convert em to rem, enter your value into the input field above. CalcuSpec applies standard international unit conversion factors instantly as you type.
Is the em To rem Converter calculation exact and standardized?
Yes, conversions on CalcuSpec use official international standard conversion factors (SI/Imperial) and compute locally in your browser with floating-point precision.
Does this typography converter require server communication?
No. All calculations run entirely inside your browser using client-side JavaScript. No data is sent to an external server or stored anywhere.
Is em To rem Converter free to use?
Yes. em To rem Converter is completely free, has no usage limit, and does not require an account, email, or API key.
What is the formula to convert EM (em) to Root EM (rem)?
1 EM (em) = 1 Root EM (rem). Multiply any EM value by 1 to calculate Root EM.
Does em To rem Converter store or upload my data?
No. em To rem Converter calculates everything locally in your browser. Nothing you type is sent to a server or stored by SpecWhale.
How accurate is em To rem Converter?
em To rem Converter uses fixed, standard conversion ratios and rounds the displayed result. The underlying math does not change, so the same input always gives the same output.
Can I embed em To rem Converter on my own website?
Yes. Use the "Embed this tool" snippet on this page to add a free, working copy of em To rem Converter to your own blog post or page.