What is this Tool?
The Unit Converter handles all common unit conversions across 6 categories — length, weight, temperature, volume, speed, and area. Whether you're cooking with a foreign recipe that uses cups and ounces, checking your speed in mph vs km/h while driving abroad, converting kilometres to miles for a running app, or working with a blueprint that uses feet and inches, this tool has you covered.
Recommended — Unit Conversion References
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📐 Engineering Unit Conversions
Engineering Reference Manual guide to converting units correctly.
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Comprehensive conversion guide for engineers and PE exam preparation.
Frequently Asked Questions
What is the metric vs imperial system?
The metric system (metres, kilograms, litres) is used by most of the world including India. The imperial system (feet, pounds, gallons) is primarily used in the USA, Liberia, and Myanmar. The UK uses a mix of both.
How do I convert Celsius to Fahrenheit?
°F = (°C × 9/5) + 32. So 100°C = 212°F. Key reference points: 0°C = 32°F (water freezes), 37°C = 98.6°F (body temperature), 100°C = 212°F (water boils).
What is a hectare?
A hectare is 10,000 square metres — commonly used for measuring land area. 1 hectare = 2.47 acres. Agricultural land in India is commonly measured in hectares or bighas (which varies by state).
How many litres are in a gallon?
1 US gallon = 3.785 litres. 1 UK (Imperial) gallon = 4.546 litres. The difference matters — if an American recipe calls for a gallon of something, it's less than a UK gallon.
How many miles is 1 kilometre?
1 kilometre is about 0.621 miles, and 1 mile is exactly 1.609344 kilometres.
How do I convert kg to pounds?
Multiply by about 2.2046 — 1 kilogram is 2.20462 pounds, and 1 pound is exactly 0.45359237 kg.
How do I convert feet and inches to cm?
1 foot is 30.48 cm and 1 inch is 2.54 cm. For example, 5 feet 6 inches is 5 × 30.48 + 6 × 2.54 = 167.64 cm.
How do I convert cm to inches?
Divide by 2.54. For example, 170 cm ÷ 2.54 ≈ 66.9 inches, or about 5 feet 7 inches.
How many square feet are in an acre?
One acre is 43,560 square feet, or about 4,046.86 square metres.
How do I convert square feet to square metres?
Multiply by 0.092903. For example, a 1,000 sq ft flat is about 92.9 square metres.
How do I convert Fahrenheit to Celsius?
°C = (°F − 32) × 5/9. For example, 98.6°F is 37°C and 104°F is 40°C.
How do I convert km/h to mph?
Divide by 1.609344 — 100 km/h is about 62.1 mph.
How much is a bigha?
A bigha is a traditional land unit whose size varies from state to state (and sometimes district to district), so there's no single conversion. Check your state's land records for the local value.
How accurate is this unit converter?
It uses exact international definitions — for example, 1 inch = 2.54 cm and 1 pound = 0.45359237 kg — and shows results to 8 significant figures. Cooking units are US measures.
Recommended — Metric & Scientific Units
⚠️ Affiliate disclosure: We may earn a small commission if you purchase through these links at no extra cost to you. Learn more
📏 Scientific Unit Conversion
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For Python programmers — attach units to calculations and avoid dimension mistakes.