# Unit converter

> Convert miles to km, pounds to kg, °F to °C, gallons to liters and more: length, weight, volume, area, speed, temperature, data, pressure and energy.

URL: https://tools.cuelark.com/unit-converter
Publisher: Cuelark Team (https://cuelark.com)
Updated: 2026-11-10
Price: free, no sign-up
Privacy: runs in the browser; files are not uploaded

Convert between US imperial and metric units: length, weight, volume, area, speed, temperature, data size, pressure and energy. Type the value and the two units.

## How to use it

1. Enter the value.
2. Type the from and to units, e.g. mi and km, lb and kg, F and C, gal and L.
3. Read the result; your last units are remembered.

## Details

- **Units:** mi, yd, ft, in, km, m, cm, mm, lb, oz, kg, g, gal, qt, cup, fl oz, L, mL, mph, kph, acre, sqft, F, C, K, KB/MB/GB, KiB/MiB/GiB and more
- **Precision:** Exact definitions (1 in = 2.54 cm, 1 lb = 0.45359237 kg), shown to 12 significant digits
- **US volume:** US gallons and fluid ounces

## Questions

### Are gallons US or imperial?

US gallons (3.785411784 L). UK imperial gallons are larger (4.54609 L).

### How do I convert feet and inches?

Convert inches: 5 ft 10 in is 70 in, which is 177.8 cm. The BMI calculator accepts 5'10" directly.

### Why do I get an error?

The two units must measure the same thing (you can't turn kilograms into liters), and the unit name must be one the converter knows; the message lists suggestions.

### Is what I type sent anywhere?

No. The calculation runs in this browser tab with the same code our MCP server uses. Nothing you type is sent to a server or saved, apart from settings like filing status, which stay in this browser.

### Can an AI agent use this?

Yes. The same function is a tool on our free MCP server at tools.cuelark.com/mcp, so ChatGPT, Claude or Cursor get exactly the answer this page shows. 'Copy MCP call' gives you the arguments.

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