CSS Unit Converter
Convert between px, em, rem, vw, vh, pt, cm, mm and more CSS units.
How to Use This Tool
- Enter your value into the CSS Unit Converter input field at the top of the page.
- Pick the source unit and the target unit, and the CSS Unit Converter will convert in real time as you type.
- Copy the converted value or swap the units to convert in the opposite direction.
Common Use Cases
- Data migration: Engineers convert between formats when moving data between systems with incompatible representations.
- Educational verification: Students check homework answers by converting between standard units or notations.
- Cross-team collaboration: Teams using different conventions exchange data via a common intermediate format produced by the Css Unit Converter.
Frequently Asked Questions
What precision does the Css Unit Converter preserve?
Numeric conversions use IEEE 754 double-precision (15-17 significant decimal digits). Lossless integer conversions remain exact up to 2^53. For exact decimal arithmetic on very large or very small values, use a server-side BigDecimal or arbitrary-precision library.
What's the supported input range?
The converter handles the full range allowed by the source format's specification. Values outside that range (e.g., negative durations, out-of-spec characters) are rejected with an error rather than silently truncated. Check the input format docs for exact limits.
Can I convert in both directions?
Yes. The converter is bidirectional: switch the source and target fields to reverse the conversion. Round-trip conversions are exact for lossless format pairs and approximate (with documented precision) for lossy ones.