6 Conversion Categories Covered
- Length: mm, cm, m, km, inch, foot, yard, mile, nautical mile
- Weight/Mass: mg, g, kg, tonne, ounce, pound, stone, US ton
- Volume: ml, cl, L, cubic meter, fl oz, cup, pint, quart, gallon
- Temperature: Celsius, Fahrenheit, Kelvin, Rankine
- Area: mm², cm², m², km², inch², foot², yard², acre, hectare
- Speed: m/s, km/h, mph, knot, Mach
Quick Reference: Most Common Conversions
- 1 mile = 1.609 km | 1 km = 0.621 miles
- 1 inch = 2.54 cm | 1 cm = 0.394 inches
- 1 kg = 2.205 lbs | 1 lb = 0.454 kg
- 1 US gallon = 3.785 L | 1 L = 0.264 gallons
- 0°C = 32°F | 100°C = 212°F | 37°C = 98.6°F (body temp)
- 1 acre = 0.405 hectares | 1 hectare = 2.471 acres
💡 Temperature Formula:
°F = (°C × 9/5) + 32
°C = (°F - 32) × 5/9
K = °C + 273.15
°F = (°C × 9/5) + 32
°C = (°F - 32) × 5/9
K = °C + 273.15
How to Use the Unit Converter
1Open the Unit Converter.
2Select a conversion category (Length, Weight, Temperature, etc.).
3Choose your source unit and enter a value.
4See all equivalent values instantly — the converter is bidirectional.
5Consult the quick reference table at the bottom for common conversions in that category.
Who Needs a Unit Converter?
- International travelers: Miles ↔ km, Fahrenheit ↔ Celsius, gallons ↔ liters
- Engineers & scientists: Precise unit conversions with multiple decimal places
- Chefs: Recipe conversions — cups to milliliters, ounces to grams
- Online shoppers: UK stone to kg, US sizes to EU sizes
- Students: Physics and chemistry homework conversions
FAQ
How accurate is the unit converter?
We use internationally standardized conversion factors from NIST (National Institute of Standards and Technology). Results are accurate to at least 6 significant figures.
Why is temperature conversion different from other units?
Temperature scales don't share a common zero point — Fahrenheit and Celsius use different reference points for freezing water. This means temperature conversion uses an additive formula, not just a multiplication factor.