Unit Converter Guide

Convert length, weight, temperature, volume, speed and more between metric and imperial units — instantly and for free.

Conversion Categories

• Length — mm, cm, m, km ↔ inch, foot, yard, mile
• Weight / Mass — mg, g, kg, tonne ↔ ounce, pound, stone, US ton
• Temperature — Celsius ↔ Fahrenheit ↔ Kelvin
• Volume — ml, litre ↔ teaspoon, tablespoon, cup, pint, gallon
• Speed — km/h ↔ mph ↔ m/s ↔ knots
• Area — cm², m², km², hectare ↔ in², ft², acre, square mile
• Data Storage — bits, bytes, KB, MB, GB, TB, PB

Common Conversion Formulas

Temperature Conversion in Detail

Temperature conversions are the most commonly misunderstood because they use an offset formula, not simple multiplication.

• Celsius to Fahrenheit: Multiply by 1.8 (9/5) then add 32. Example: 100°C = (100 × 1.8) + 32 = 212°F (boiling point of water).
• Fahrenheit to Celsius: Subtract 32 then multiply by 5/9. Example: 98.6°F = (98.6 − 32) × 5/9 = 37°C (normal body temperature).
• Kelvin: Kelvin is an absolute scale — 0 K is absolute zero (−273.15°C). No negative values exist. Used in science and engineering.

Metric vs Imperial: Quick Reference

India, most of Asia and Europe use the metric system. The United States, Myanmar and Liberia primarily use imperial units. Knowing both is essential when reading international recipes, product specs and medical measurements.

• 1 kg = 2.205 lbs (useful for body weight, groceries)
• 1 litre ≈ 1.057 US quarts; 3.785 litres = 1 US gallon
• 1 mile = 1.609 km; 1 km = 0.621 miles
• 1 foot = 30.48 cm; 5 feet 10 inches ≈ 177.8 cm
• 1 acre = 4,047 m²; 1 hectare = 10,000 m² = 2.471 acres

Frequently Asked Questions