Unit Converter Online - All in One
Convert length, weight, temperature, area, volume, speed, time and data units. Free, with no signup.
All Conversions for Length
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What Is a Unit Converter?
A unit converter changes a value from one unit of measurement to another, such as kilometres to miles, kilograms to pounds or Celsius to Fahrenheit. This tool covers eight categories: length, weight, temperature, area, volume, speed, time and data storage. The result updates as you type, and the swap button reverses the conversion. For a selected category, it also shows the value in all the other units at once.
How to Use the Unit Converter
- Choose a category from the tabs, such as Length, Weight or Temperature.
- Enter the value in the From box and select the From unit.
- Select the To unit. The result appears as you type.
- Click ⇄ to swap the units, or Copy Result to copy the answer.
Example: 100 °C in Fahrenheit is 212 °F.
Common Unit Conversions
| Category | Conversion |
|---|---|
| Length | 1 inch = 2.54 cm. 1 foot = 30.48 cm. 1 mile = 1.609344 km. 1 m = 3.28084 ft. |
| Weight | 1 kg = 2.20462 lb. 1 lb = 0.45359237 kg. 1 oz = 28.3495 g. |
| Temperature | °F = (°C × 9/5) + 32. K = °C + 273.15. |
| Area | 1 acre = 4,046.86 m² = 43,560 sq ft. 1 hectare = 2.47105 acres. 1 m² = 10.7639 sq ft. |
| Volume | 1 US gallon = 3.78541 L. 1 UK gallon = 4.54609 L. |
| Speed | 1 km/h = 0.621371 mph. 1 m/s = 3.6 km/h. |
| Time | 1 day = 86,400 seconds. 1 week = 168 hours. |
Height Conversion
| Feet and inches | Centimetres |
|---|---|
| 5 ft 0 in | 152.4 cm |
| 5 ft 6 in | 167.64 cm |
| 5 ft 10 in | 177.8 cm |
| 6 ft 0 in | 182.88 cm |
Temperature Reference Points
| Point | °C | °F |
|---|---|---|
| Water freezes | 0 | 32 |
| Normal body temperature | 37 | 98.6 |
| Water boils | 100 | 212 |
| Same in both scales | −40 | −40 |
Units That Differ by Region or System
| Unit | What to know |
|---|---|
| Bigha | The size of a bigha is different in different states and even within a state. For land records or a purchase, always check the local measure in your official documents. |
| Gallon | A US gallon is 3.785 litres and a UK (imperial) gallon is 4.546 litres. |
| Cup | A US cup is about 237 ml. A metric cup is 250 ml. |
| MB and GB | In the decimal (SI) system, 1 GB = 1000 MB. In the binary system, 1 GiB = 1024 MiB. Storage makers and mobile data plans use decimal. Many operating systems use binary. |
| Month and year | Months and years have different lengths, so a converter must use an average length. |
Why Use the WebToolsKit Unit Converter?
- Eight categories in one place: Length, weight, temperature, area, volume, speed, time and data.
- Instant results: The answer updates as you type, and you can see all units at once.
- Private by design: Conversions run in your browser and your values are not sent to our server.
Frequently Asked Questions
1. How do I convert km to miles?
1 kilometre = 0.621371 miles. Open the Length tab, enter the value in km and select Miles as the To unit. For example, 10 km = 6.21 miles.
2. How do I convert kg to lbs?
1 kilogram = 2.20462 pounds. Open the Weight tab, enter the kg value and select lbs as the To unit. For example, 70 kg = 154.32 lbs.
3. How do I convert Celsius to Fahrenheit?
Use °F = (°C × 9/5) + 32. For example, 100 °C = 212 °F, and 37 °C = 98.6 °F.
4. How many MB are in a GB?
In the decimal (SI) system, 1 GB = 1000 MB. In the binary system, 1 GiB = 1024 MiB. Storage makers and mobile data plans use decimal, while many operating systems use binary, so numbers can look different.
5. Is a bigha the same everywhere in India?
No. The size of a bigha differs between states and even within a state. For land records or a purchase, check the local measure in your official documents.
6. What is the difference between a US gallon and a UK gallon?
A US gallon is 3.785 litres and a UK (imperial) gallon is 4.546 litres. Check which one you need before converting.
7. Is the unit converter free and private?
Yes, it is free and needs no signup. Conversions run in your browser, and your values are not sent to our server.