# Unit Converter - Length, Weight, Temperature, Speed, Data and More

> Free online unit converter: length, area, volume, weight, temperature, time, speed, data, pressure, energy and angle — one value converts every unit at once.

- URL: https://qilingtools.com/en/math/unit
- Category: Math Tools (https://qilingtools.com/en/math)
- Tags: [Math](https://qilingtools.com/en/tags/math), [Physics](https://qilingtools.com/en/tags/physics), [Converters](https://qilingtools.com/en/tags/convert)
- Last updated: 2026-10-26
- Price: Free, no sign-up
- Privacy: Runs locally in the browser; files are never uploaded

Enter a value and every unit in the same category is converted at once, so there is no target unit to pick. Eleven categories cover metric, imperial and traditional Chinese units for everyday and classroom use.

## How to use

1. Choose a category (length, weight, temperature …)
2. Enter the value and select the unit you are converting from
3. Read every converted value below; click a row to switch the input unit

## Features

- 11 categories and over a hundred units, all listed at once
- Traditional Chinese units (jin, liang, mu, chi, cun, li) included
- Temperature converted by formula between °C, °F and K
- Data storage uses 1024-based units, matching file sizes
- Every value can be copied in one click

## FAQ

### How many centimetres are in an inch?

Exactly 2.54 cm. Enter 1 inch in the Length category to see every other unit as well.

### How do I convert kilograms to pounds?

1 kg ≈ 2.2046 lb. Choose Weight, enter the value in kilograms and read the pound row.

### How do I convert Fahrenheit to Celsius?

°C = (°F − 32) × 5 / 9. Pick the Temperature category and enter the Fahrenheit value to get Celsius and Kelvin.

### Is a KB 1000 or 1024 bytes here?

The data category uses 1024 bytes per KB, matching how operating systems report file sizes.

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