All-in-One Unit Converter
Converting between units should take seconds, not a search through tables. This free all-in-one unit converter handles length, weight, temperature, area, volume, speed, time, data storage, pressure and energy in a single tool — pick a category, enter your value, and see the answer instantly, with the same value shown in every other unit in that category. It uses exact standard factors (for example 1 mile = 1,609.344 metres and 1 kilogram = 2.20462 pounds), and temperature uses the correct offset formulas, not a simple factor, so 100 °F really is 37.78 °C. Whether you are converting kilometres to miles for a trip, kilograms to pounds for a recipe, or gigabytes to megabytes for a file, the result updates live as you type. All calculations run in your browser, and nothing you enter is sent anywhere.
Your Conversion
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Common Conversions in This Category
The table below converts your value into every unit in the selected category at once, so you can compare them side by side.
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How to Use This Calculator
- Pick a category. Choose length, weight, temperature, area, volume, speed, time, data, pressure or energy. The unit lists update automatically.
- Enter your value. Type the number you want to convert — for example 5 kilometres or 100 degrees Fahrenheit.
- Choose the from and to units. Pick the unit you are converting from and the unit you want the answer in. Use Swap Units to reverse them instantly.
- Read the result. The conversion updates live as you type, and the table underneath shows the same value in every other unit in that category.
Worked Example
Suppose you want to convert 5 kilometres into miles. Choose the Length category, enter 5, select kilometres as the from unit and miles as the to unit. One kilometre equals 0.621371 miles, so 5 × 0.621371 = 3.106855, which the converter rounds to 3.11 miles. Temperature works differently because it uses an offset, not just a factor: 100 °F converts to (100 − 32) × 5 ÷ 9 = 37.78 °C, and the same value is 310.93 K. As another check, 1 kilogram equals 2.2046 pounds, so 70 kg is 154.32 lb.
Frequently Asked Questions
How do I convert kilometres to miles?
Multiply the number of kilometres by 0.621371. For example, 5 km × 0.621371 = 3.11 miles. To go the other way, multiply miles by 1.609344 to get kilometres.
Why is temperature conversion different from length or weight?
Length and weight use a simple multiplication factor, but temperature scales start at different zero points, so they need an offset as well. To convert Fahrenheit to Celsius, subtract 32 and multiply by 5/9; to convert Celsius to Fahrenheit, multiply by 9/5 and add 32. Kelvin is Celsius plus 273.15.
How many pounds are in a kilogram?
One kilogram equals 2.20462 pounds. So 70 kg is 70 × 2.20462 = 154.32 lb, and 1 lb equals 0.45359237 kg.
How many megabytes are in a gigabyte?
Using the binary definition this converter uses, 1 gigabyte equals 1,024 megabytes, and 1 megabyte equals 1,024 kilobytes. So 2 GB is 2,048 MB. Some storage makers use 1,000 instead of 1,024, which is why a drive labelled 500 GB may show as about 465 GB on your computer.
Can I convert between metric and imperial units?
Yes. Every category includes both metric and imperial units where they exist — for example metres and feet for length, kilograms and pounds for weight, and litres and US gallons for volume. Pick the category, enter your value, and choose any from and to units.