Unit Converter
Convert between units instantly. Length, weight, temperature, volume, area, speed, time, and more.
Complete Unit Conversion Guide
Unit conversion is essential for everyday life, science, cooking, travel, and international communication. Our comprehensive converter handles all common conversions between metric and imperial systems, temperature scales, and specialized units.
Common Conversions Quick Reference
Length: 1 inch = 2.54 cm, 1 foot = 30.48 cm, 1 yard = 0.914 m, 1 mile = 1.609 km, 1 meter = 3.281 feet, 1 km = 0.621 miles.
Weight: 1 oz = 28.35 g, 1 lb = 0.454 kg, 1 kg = 2.205 lbs, 1 ton = 907 kg, 1 stone = 6.35 kg.
Temperature: °F = (°C × 9/5) + 32, °C = (°F - 32) × 5/9, Water freezes: 32°F = 0°C, Water boils: 212°F = 100°C.
Volume: 1 tsp = 5 ml, 1 tbsp = 15 ml, 1 cup = 237 ml, 1 pint = 473 ml, 1 quart = 946 ml, 1 gallon = 3.785 L, 1 liter = 1000 ml = 33.814 oz.
Metric vs Imperial Systems
The Metric System (SI Units)
Used by 95% of countries worldwide. Base-10 system making calculations simple: 1 km = 1000 m = 100,000 cm = 1,000,000 mm. Units include: Length (meter), Mass (gram/kilogram), Volume (liter), Temperature (Celsius). Advantages: logical base-10, easy mental math, scientific standard, international communication.
The Imperial System
Used primarily in United States. Non-uniform conversions: 12 inches = 1 foot, 3 feet = 1 yard, 5,280 feet = 1 mile. Units include: Length (inch, foot, yard, mile), Weight (ounce, pound, ton), Volume (cup, pint, quart, gallon), Temperature (Fahrenheit). Advantages: human-scaled (foot ≈ actual foot length), familiar to Americans, traditional measurement in some industries.