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.

Unit Converter

Q: 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.

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

Linear conversions (length, weight, volume, speed, area):

Result = Value × (From unit factor) ÷ (To unit factor)

(all units convert through their SI base unit)

Temperature (non-linear):

°C to °F: F = C × 9/5 + 32

°F to °C: C = (F − 32) × 5/9

°C to K: K = C + 273.15

K to °C: C = K − 273.15

📖 How to Use This Calculator

Select a category (Length, Weight, Temperature, etc.)

Enter the value to convert.

Select the From unit and To unit.

The result updates instantly - no button press needed.

💡 Example Calculations

Example 1 - 100 km to miles

100 km × (1 ÷ 1.60934) = 62.14 miles

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Example 2 - 37°C (body temperature) to Fahrenheit

°F = 37 × 9/5 + 32 = 66.6 + 32 = 98.6°F

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Example 3 - 5 kg to pounds

5 × 2.20462 = 11.02 lbs

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Example 4 - 1 US Gallon to litres

1 US gallon × 3.78541 = 3.785 litres. Note: 1 UK (Imperial) gallon = 4.546 litres - always confirm which gallon is meant.

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Example 5 - 60 mph to km/h

60 mph × 1.60934 = 96.56 km/h. The UK national speed limit of 70 mph = 112.65 km/h.

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❓ Frequently Asked Questions

How do I convert kilometres to miles?+

1 kilometre = 0.621371 miles. Multiply km by 0.621371 to get miles. For a quick mental approximation, multiply by 0.6. Example: 100 km × 0.621371 = 62.14 miles. Going back, multiply miles by 1.60934 to get km.

How do I convert Celsius to Fahrenheit?+

Use the formula °F = (°C × 9/5) + 32. Example: 100°C × 1.8 + 32 = 212°F (boiling point). Body temperature is 37°C = 98.6°F. To reverse: °C = (°F − 32) × 5/9. Temperature is the only non-linear unit conversion - it uses an offset formula, not just multiplication.

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. To convert back, divide pounds by 2.20462. A quick approximation: kg × 2.2 ≈ pounds.

How many litres are in a gallon?+

1 US gallon = 3.78541 litres. 1 UK (Imperial) gallon = 4.54609 litres. These are different - the US gallon is smaller. Fuel economy is expressed in mpg (miles per US gallon) in the US, while India and most countries use km/litre. Always confirm which gallon is being referenced.

What is a metre in feet and inches?+

1 metre = 3.28084 feet = 3 feet 3.37 inches. 1 foot = 0.3048 metres. A person who is 6 feet tall is 1.8288 metres. 5'10" (5 feet 10 inches) = 70 × 0.0254 = 1.778 m ≈ 1.78 m.

How do I convert Kelvin to Celsius?+

Celsius = Kelvin − 273.15. For example, 300 K = 26.85°C ≈ 27°C (room temperature). 0 K (absolute zero) = −273.15°C. Kelvin is used in scientific contexts where negative temperatures are meaningless - gases and thermodynamic equations always use Kelvin. To convert Kelvin to Fahrenheit: F = (K − 273.15) × 9/5 + 32.

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.

How many millilitres are in a cup?+

1 US cup = 236.59 mL (approximately 237 mL or 240 mL for cooking). 1 metric cup (Australia) = 250 mL. 1 UK imperial cup = 284 mL. These differences matter in baking: a recipe using Australian cups will have 5% more liquid than a US recipe. Always check which cup system a recipe uses, especially for international recipes.

What is the difference between mass and weight in unit conversions?+

Mass (kg, g, lb) measures the amount of matter in an object and is constant regardless of location. Weight is a force (Newtons) = mass x gravitational acceleration. In everyday use, we typically mean mass when we say weight. On the Moon (gravity 1/6 of Earth), your mass stays the same but you weigh 6x less. Unit converters typically convert mass units; force converters handle Newtons to pounds-force.

🔗 Related Calculators

📌 Quick Tips

💡Temperature conversions are the only non-linear unit conversions - they use an offset formula (°C to °F: multiply by 9/5 then add 32), not just multiplication.

💡For cooking conversions, 1 US cup = 240 ml = 16 tablespoons = 48 teaspoons. Dry ingredients should be weighed in grams for precision.