EM to REM Converter & Conversion Tables [Online Calculator]

Q: How do I convert EM to REM in CSS?

To convert EM to REM, use this formula: REM Value = EM Value × (Parent Font Size ÷ Base Font Size) . Example: 1.5em × (16 ÷ 16) = 1.5rem .

Q: What is the standard base font size for EM to REM conversion?

Most designs use 16px as the standard base font size in CSS.

Easily convert EM to REM with this free online CSS unit converter. Ideal for web designers, developers, and UI/UX professionals, this calculator ensures precise scaling for responsive typography, spacing, and layout consistency.

✅ Perfect for scaling text and spacing relative to the root element.
✅ Designed to simplify responsive web design with improved flexibility.

Start Converting Now →

EM to REM Conversion Calculator

EM to REM Converter

Enter your EM value below to instantly convert it to REM.

EM Value: Base Font Size (default 16px): REM Value:

Input Field → Enter EM Value
Base Font Size Input → Enter Base Font Size (default: 16px)
Convert Button → Instantly Calculate REM Value
Copy Button → One-click copy for easy use in CSS code
Reset Button → Clear your inputs with one click

Example Calculation:

1.5em with a base font size of 16px = 1.5rem

EM to REM Conversion Table (Based on 16px Base Font Size)

EM	REM
0.5em	0.5rem
0.75em	0.75rem
1em	1rem
1.5em	1.5rem
2em	2rem
3em	3rem
4em	4rem
5em	5rem
6em	6rem
10em	10rem

Use this table for common conversions in CSS for better scalability.

How to Use the EM to REM Converter?

Step 1: Enter your EM value in the input field.

Step 2: Enter your desired base font size (default: 16px).

Step 3: Click the “Convert” button to get the REM value instantly.

Step 4: Use the copy button to grab the calculated REM value for quick use in your CSS code.

Step 5: Reference the conversion table for standard values.

💡 Pro Tip: For accurate scaling, ensure your base font size matches your project’s root <html> font size.

When to Use EM vs REM in CSS?

EM (Element Relative Measurement)

✅ Ideal for elements that should scale relative to their parent container.
✅ Useful for nested elements with adaptable designs.

REM (Root EM)

✅ Preferred for scalable typography with a consistent root size.
✅ Best used for global text sizing, padding, and margins.

Which One Should You Use?

Use EM for dynamic, relative scaling within parent containers.
Use REM for consistent sizing across the entire website.

FAQs About EM to REM Conversion

How do I convert EM to REM in CSS?

To convert EM to REM, use this formula: REM Value = EM Value × (Parent Font Size ÷ Base Font Size). Example: 1.5em × (16 ÷ 16) = 1.5rem.

What is the formula to convert EM to REM?

REM Value = EM Value × (Parent Font Size ÷ Base Font Size)

Why should I use REM instead of EM in CSS?

REM is ideal for consistent typography across your entire website.

What is the standard base font size for EM to REM conversion?

Most designs use 16px as the standard base font size in CSS.

Is REM better for consistent text sizes in modern CSS?

Yes! REM ensures consistent scaling across your entire design, improving maintainability.

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