📐 Free Online Tool
Unit Converter
Convert length, weight, temperature, area, volume, speed and data units instantly. Results update as you type.
Converted Result
—
Enter a value to see the conversion formula
Quick Reference — Length
| From | To | Multiply by |
|---|
Free Unit Converter — 7 Categories, Instant Results
Convert between hundreds of units across 7 categories — length, weight, temperature, area, volume, speed and data storage. Results update live as you type with the full formula shown.
📏 Length
Meters, kilometers, miles, feet, inches, yards, nautical miles and more.
⚖️ Weight
Grams, kilograms, pounds, ounces, tonnes and stone.
🌡️ Temperature
Celsius, Fahrenheit and Kelvin with exact formula shown.
📦 Area / Volume
Square and cubic units from cm² to acres and litres to gallons.
💨 Speed
km/h, mph, m/s, knots and more.
💾 Data
Bits, bytes, KB, MB, GB, TB and beyond.
Frequently Asked Questions
Is this unit converter free?
Yes — completely free, with no limits and no account required.
How accurate are the conversions?
All conversions use internationally recognised conversion factors and are calculated with JavaScript's full floating-point precision. The result is displayed to up to 8 significant figures.
How does temperature conversion work?
Temperature uses specific formulas (not a simple multiplier) — e.g. °C to °F = (°C × 9/5) + 32. The full formula is always shown below the result.
Can I swap the from and to units?
Yes — click the swap arrows button between the unit selectors to instantly reverse the conversion direction.