Unit Conversion Fundamentals: Metric, Imperial, and Why They Matter
Master conversion factors between systems with practical examples
Understand the key conversion factors between metric and imperial units for length, weight, temperature, volume, and more. Never confuse cm and inches again.
What You'll Learn
- •Inch to cm and foot conversion
- •Kg to lbs and stone conversion
- •Celsius to Fahrenheit formula
- •US gallon vs UK gallon difference
- •Acre to hectare conversion
- •mph to km/h conversion
- •Binary vs decimal digital storage
- •Metric prefix system (kilo, milli, centi)
Full Guide
The world uses two major measurement systems: metric (used by most countries) and imperial (US, Myanmar, Liberia). Converting between them is essential for international trade, cooking, engineering, and travel.
Length Conversions
- 1 inch = 2.54 cm exactly (defined)
- 1 foot = 30.48 cm
- 1 mile = 1.609 km
- 1 yard = 0.9144 m
- 1 nautical mile = 1.852 km
Weight Conversions
- 1 kg = 2.20462 lbs
- 1 lb = 453.592 grams
- 1 stone = 14 lbs (UK body weight measurement)
Temperature Formulas
- °F to °C: °C = (°F - 32) × 5/9
- °C to °F: °F = (°C × 9/5) + 32
- K to °C: K = °C + 273.15
Volume Conversions
- 1 US gallon = 3.785 liters
- 1 UK gallon = 4.546 liters (larger than US)
- 1 cup = 236.6 mL (US legal cup)
- 1 fluid oz = 29.57 mL
Area Conversions
- 1 acre = 0.4047 hectares = 4,047 sq meters
- 1 sq foot = 929.03 sq cm
Speed Conversion
1 mph = 1.609 km/h. Example: 60 mph = 96.5 km/h.
Digital Storage: Binary vs Decimal
- Binary (KiB, MiB, GiB): Uses 1024 factor
- Decimal (KB, MB, GB): Uses 1000 factor
- 1 GiB = 1.07374 GB
Why Metric Wins
The metric system is base-10 (like our number system), so conversions are just moving decimals:
- Kilo = 1000
- milli = 0.001
- centi = 0.01