Free Online Unit Converter
Convert between metric and imperial units for length, weight, temperature, volume, and more. Accurate, easy-to-use calculator for all your conversion needs.
Why Use Our Unit Converter?
Comprehensive
Convert between 100+ units across 8 different categories including length, weight, temperature, and more.
Instant Results
Get accurate conversions in real-time as you type or change units.
Precise Calculations
Our tool uses exact conversion factors for reliable, accurate results every time.
Metric vs Imperial: Understanding Measurement Systems
The world uses two main systems of measurement: the metric system and the imperial system. Our unit converter helps you seamlessly convert between these systems.
The Metric System
The metric system is an international decimal-based system of measurement used by most countries worldwide. It's based on multiples of 10, making conversions straightforward.
- Length: millimeter (mm), centimeter (cm), meter (m), kilometer (km)
- Weight/Mass: gram (g), kilogram (kg), metric ton (t)
- Volume: milliliter (mL), liter (L), cubic meter (m³)
The Imperial System
The imperial system is primarily used in the United States and consists of units with historical origins. Conversions between units are less systematic than the metric system.
- Length: inch (in), foot (ft), yard (yd), mile (mi)
- Weight/Mass: ounce (oz), pound (lb), stone (st), ton
- Volume: fluid ounce (fl oz), pint (pt), quart (qt), gallon (gal)
Common Conversion Tables
Reference these common conversions for quick calculations:
Length Conversions
| Metric | Imperial |
|---|---|
| 1 millimeter (mm) | 0.03937 inches (in) |
| 1 centimeter (cm) | 0.3937 inches (in) |
| 1 meter (m) | 3.2808 feet (ft) |
| 1 kilometer (km) | 0.6214 miles (mi) |
Weight Conversions
| Metric | Imperial |
|---|---|
| 1 gram (g) | 0.0353 ounces (oz) |
| 1 kilogram (kg) | 2.2046 pounds (lb) |
Frequently Asked Questions
What's the difference between metric and imperial units?
The metric system is decimal-based and used worldwide, while the imperial system uses various conversion factors and is primarily used in the United States.
How accurate are the conversions?
Our tool uses precise conversion factors to ensure maximum accuracy in all calculations.
Can I convert between units in the same system?
Yes, you can convert between any units in our converter, whether they're in the same system or different systems.
Do you support uncommon or historical units?
We focus on commonly used modern units, but include some traditional units like stones for weight.