Pixel to REM Converter
Convert pixels (PX) to REM and EM units instantly. Perfect for responsive web design and accessibility.
Typography Studio
When to use REM vs EM?
REM (Root EM)
Relative to the HTML (Root) element's font size. Predictable and consistent across the entire page.
- Best for Typography (H1, H2, Body)
- Best for Main Layout Padding/Margin
- Ensures Global Scalability
EM (Relative EM)
Relative to the Immediate Parent's font size. Units "cascade" and can compound based on nesting.
- Best for Component-specific scaling
- Best for Icons inside text
- Modular & Self-contained
Design Insights
The 16px Standard
Most browsers default to 16px as the root font size, which is why 1rem usually equals 16px.
Accessibility First
Using REM units is a key requirement for WCAG accessibility compliance as it respects user zoom settings.
Golden Ratio
Many designers use 16px base with a 1.618 scale to create harmonious typography systems.
Device Independence
CSS pixels are "reference pixels", not physical hardware pixels, ensuring consistent sizing across displays.
Conversion Formulas
PX to REM
rem = target_px / root_baseExample: 24px / 16px = 1.5rem
REM to PX
px = target_rem * root_baseExample: 2rem * 16px = 32px
PX to REM Reference Table (Base: 16px)
| Pixel (PX) | REM (Root) | EM (Relative) | Percentage (%) | Typical Usage |
|---|---|---|---|---|
| 6px | 0.375 rem | 0.375 em | 37.5% | Caption |
| 8px | 0.500 rem | 0.500 em | 50.0% | Caption |
| 10px | 0.625 rem | 0.625 em | 62.5% | Caption |
| 12px | 0.750 rem | 0.750 em | 75.0% | Caption |
| 14px | 0.875 rem | 0.875 em | 87.5% | Caption |
| 16px | 1.000 rem | 1.000 em | 100.0% | Body |
| 18px | 1.125 rem | 1.125 em | 112.5% | Body |
| 20px | 1.250 rem | 1.250 em | 125.0% | Heading |
| 24px | 1.500 rem | 1.500 em | 150.0% | Heading |
| 32px | 2.000 rem | 2.000 em | 200.0% | Heading |
| 40px | 2.500 rem | 2.500 em | 250.0% | Display |
| 48px | 3.000 rem | 3.000 em | 300.0% | Display |
| 64px | 4.000 rem | 4.000 em | 400.0% | Display |
Overview & Capabilities
Convert pixels (PX) to REM and EM units instantly. Perfect for responsive web design and accessibility.
How to Use
Key Features
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Frequently Asked Questions
Q What is the difference between REM and EM?
REM is relative to the root (HTML) element font size, while EM is relative to the parent element font size.
Q Why should I use REM instead of PX?
REM units allow the website to scale properly when users change their browser zoom or default font size settings, improving accessibility.
Q What is the default base font size?
The default base font size for most browsers is 16px.