PERCENTAGE → REM Converter
Converting from PERCENTAGE to REM is common when switching from excellent for flexible, relative sizing. to useful for typography scaling and accessibility. in CSS projects.
Conversion Form
About the Unit
Percentage (%): Percentage is a relative unit of measurement that expresses a value as a fraction of 100. It is widely used in CSS to define dimensions of elements in a fluid and adaptable manner. For example, if you define an element's width as 50%, it will occupy half of its parent element's width. Using percentages allows elements to automatically adjust based on their container’s size, which is ideal for creating responsive layouts that work well on different devices, such as smartphones, tablets, and desktops. Percentage is also useful for properties like margin, padding, and height, where you want the element to adjust proportionally to its parent container, rather than setting a fixed value. This unit is essential for creating flexible and adaptable layouts where content adjusts automatically to changes in screen size or device layout.
Pro Tip: percentage → rem
Use rem for consistent scaling across devices.
Quick Reference: Unit Conversion by Tens
| PERCENTAGE | REM |
|---|---|
| 10% | 0.001rem |
| 20% | 0.002rem |
| 30% | 0.003rem |
| 40% | 0.004rem |
| 50% | 0.005rem |
| 60% | 0.006rem |
| 70% | 0.007rem |
| 80% | 0.008rem |
| 90% | 0.009rem |
| 100% | 0.01rem |
| 110% | 0.011rem |
| 120% | 0.012rem |
| 130% | 0.013rem |
| 140% | 0.014rem |
| 150% | 0.015rem |
| 160% | 0.016rem |
| 170% | 0.017rem |
| 180% | 0.018rem |
| 190% | 0.019rem |
| 200% | 0.02rem |
| 210% | 0.021rem |
| 220% | 0.022rem |
| 230% | 0.023rem |
| 240% | 0.024rem |
| 250% | 0.025rem |
Live Unit Preview
See how different CSS units affect the size of the box below:
10px
10rem
10em
10%
10vw
10vh
Common Mistake
Use rem for consistent scaling across devices.
Real Code Example
/* Mobile-first card with percentage → rem */
.card {
padding: 0%; /* undefinedrem */
font-size: 1.5rem;
width: min(90vw, 40ch);
}Frequently Asked Questions About PERCENTAGE
When should I use percentage instead of percentage?
Use percentage for fluid layouts and relative sizing.
How many percentage is 100percentage?
100% equals the full size of the parent.
Is percentage affected by parent size?
Yes, it's entirely dependent on the parent.
Is percentage good for widths?
Yes, it's ideal for responsive widths.
Keyboard Shortcuts
- Ctrl + C: Convert
- Ctrl + I: Invert units
- Esc: Reset values