Unit Converter — Free Online Length, Weight & Temperature Converter
Convert between common units instantly.
About the Unit Converter
Converting between measurement systems is a daily need for cooks, travelers, engineers, and students. This converter covers the five most common categories — length, weight, temperature, speed, and volume — with instant results as you type.
How conversions work
Step 1 → Convert input to the base unit (e.g., meters for length)
Step 2 → Convert base unit to the target unit
Example → 5 miles × 1609.344 = 8046.72 m ÷ 1000 = 8.047 km
Common conversions to know
- 📏1 mile = 1.609 km · 1 inch = 2.54 cm · 1 foot = 30.48 cm
- ⚖️1 pound = 453.6 g · 1 stone = 6.35 kg · 1 ounce = 28.35 g
- 🌡️°F to °C: subtract 32, multiply by 5/9 · 0°C = 32°F · 100°C = 212°F
- 🧪1 US gallon = 3.785 L · 1 cup = 240 mL · 1 fl oz = 29.57 mL
Related: Percentage Calculator for ratio and proportion calculations.
Frequently Asked Questions
Is the Unit Converter free?
Yes — completely free. No account and no data sent to a server.
Do I need an account?
No account, no login, and no signup required.
What unit categories are supported?
Length (metric and imperial), weight/mass, temperature (Celsius, Fahrenheit, Kelvin), speed, and volume. Results update instantly as you type.
How do I convert Fahrenheit to Celsius?
Subtract 32 from the Fahrenheit value, then multiply by 5/9. Quick reference: 32°F = 0°C (freezing), 98.6°F = 37°C (body temperature), 212°F = 100°C (boiling). The calculator handles this automatically.