Unit Converter
Convert length, weight, temperature, volume, and speed units instantly.
📖 What is a Unit Converter?
A unit converter translates a measurement from one unit to another within the same physical quantity - length, weight, temperature, volume, speed, or area. It's an indispensable everyday tool for cooking, travel, science, engineering, and general life in a world where different countries use different measurement systems.
The world is split between the metric system (used by most of the world, including India) and the imperial system (primarily the US, with the UK using a hybrid). This creates constant need for conversion: Indian fuel efficiency is in km/litre, while US cars are rated in miles per gallon. Recipes from the US use cups and ounces, while most kitchens outside the US use grams and millilitres. A US weather forecast in Fahrenheit needs converting to Celsius.
This converter covers six categories: Length (km, miles, feet, inches, and more), Weight/Mass (kg, lbs, grams, ounces, stone), Temperature (Celsius, Fahrenheit, Kelvin - with the proper non-linear formula), Volume (litres, gallons, cups, fluid ounces), Speed (km/h, mph, m/s, knots), and Area (square metres, acres, hectares, square feet).
Temperature is the only non-multiplicative conversion - it requires the formula °F = (°C × 9/5) + 32, not a simple multiplication factor. All other units convert through a base unit (the SI unit) using multiplication factors.
📐 Formula
📖 How to Use This Calculator
💡 Example Calculations
Example 1 - 100 km to miles
Example 2 - 37°C (body temperature) to Fahrenheit
Example 3 - 5 kg to pounds
Example 4 - 1 US Gallon to litres
Example 5 - 60 mph to km/h
❓ Frequently Asked Questions
🔗 Related Calculators
How do I convert kilometres to miles?
1 kilometre = 0.621371 miles. Multiply km by 0.621371 to get miles. Or use the approximation: multiply km by 0.6 for a rough answer. Example: 100 km × 0.621371 = 62.14 miles.
How do I convert Celsius to Fahrenheit?
°F = (°C × 9/5) + 32. Example: 100°C × 1.8 + 32 = 180 + 32 = 212°F. To convert back: °C = (°F − 32) × 5/9. Body temperature is 37°C = 98.6°F.
How do I convert kilograms to pounds?
1 kg = 2.20462 lbs. Multiply kg by 2.20462 to get pounds. Example: 70 kg × 2.20462 = 154.32 lbs. Conversely, divide pounds by 2.20462 to get kilograms.
How many litres are in a gallon?
1 US gallon = 3.78541 litres. 1 UK (Imperial) gallon = 4.54609 litres. These two are different! The US gallon is smaller. Fuel economy is often expressed in mpg (miles per US gallon) in the US, while India and most countries use km/litre.
What is a metre in feet and inches?
1 metre = 3.28084 feet = 3 feet 3.37 inches. 1 foot = 0.3048 metres. 6 feet = 1.8288 metres ≈ 1.83 m. Height of 5'10" = (5×12 + 10) × 0.0254 = 70 × 0.0254 = 1.778 m.
How many kilometres are in a mile?
1 mile = 1.60934 kilometres. To convert miles to kilometres, multiply by 1.60934 (or approximately 1.61). To convert kilometres to miles, multiply by 0.62137 (or approximately 0.621). Quick mental conversion: 5 miles is approximately 8 km (exactly 8.047). Common benchmarks: 1 km = 0.62 miles, 5 km = 3.1 miles, 10 km = 6.2 miles, 26.2 miles (marathon) = 42.2 km.
How do I convert square metres to square feet?
Multiply square metres by 10.764 to get square feet. 1 sq m = 10.764 sq ft. So 50 sq m = 538.2 sq ft. The reverse: divide sq ft by 10.764. This conversion is commonly needed when comparing property sizes - Indian listings use sq ft, European listings often use sq m.
How do I convert litres to US gallons?
1 US gallon = 3.785 litres. To convert litres to gallons, divide by 3.785. To convert gallons to litres, multiply by 3.785. Note: the US gallon and UK (imperial) gallon are different - 1 UK gallon = 4.546 litres. Most international references to gallons mean US gallons, but fuel economy in the UK and Canada is measured in Imperial gallons or litres per 100 km.