Free Unit Converter — Length, Weight, Temperature, Volume, Speed & More
Convert between hundreds of units across 8 categories: length, weight, temperature, volume, speed, area, data storage, and time. All conversions happen instantly in your browser — no server needed.
Key Features
- 8 categories: length, weight, temperature, volume, speed, area, data, time
- Swap button to reverse the conversion instantly
- All-conversions panel shows every unit at once for the current input
- Supports imperial, metric, and specialized units (nautical mile, stone, etc.)
- 100% client-side — works offline
SimplyUtils vs Competitors
| Feature | SimplyUtils | Google Calculator | UnitConverters.net | ConvertUnits.com |
|---|
| Free to use | ✓ | ✓ | ✓ | ✓ |
| No ads interrupting UI | ✓ | ✓ | ✗ | ✗ |
| All conversions shown at once | ✓ | ✗ | ✗ | ✗ |
| 8+ categories | ✓ | ✓ | ✓ | ✓ |
| Offline support | ✓ | ✗ | ✗ | ✗ |
Frequently Asked Questions
How accurate are the conversions?
All conversions use standard SI definitions. Temperature uses exact formulas (not approximations). Results are shown to up to 10 significant figures.
Can I convert between imperial and metric?
Yes, all categories support both systems. For example, length supports meters, feet, inches, miles, and more.
Does it work offline?
Yes, once the page loads, all calculations happen in your browser with no server dependency.