# Temperature Converter

> Convert between Celsius, Fahrenheit, and Kelvin. Bidirectional — type in any field, all three update live.

URL: https://uttir.com/temperature-converter
Categories: converters
Privacy: Math runs locally. No data leaves your browser.

## About

Celsius, Fahrenheit, and Kelvin are three different ways to measure the same thing — temperature. Celsius is used by most of the world and by science. Fahrenheit is used in the US. Kelvin is the SI unit and starts at absolute zero, used in physics and engineering.

Type a value in any field and the other two update instantly. No buttons to press, no server round-trips — the math is trivial and runs entirely in your browser.

## How to use

1. **Enter a value** — In any of the three fields — Celsius, Fahrenheit, or Kelvin.
2. **Read the conversion** — The other two fields update live.
3. **Copy or note** — The fields are editable, so select and copy whatever you need.

## Examples

### Boiling point of water

100 °C → 212 °F → 373.15 K

Output:

```
100 °C = 212 °F = 373.15 K
```

### Absolute zero

The lowest possible temperature — 0 K = -273.15 °C = -459.67 °F.

Output:

```
0 K = -273.15 °C = -459.67 °F
```

## FAQ

### What is Kelvin?

Kelvin is the SI unit of temperature. It starts at absolute zero (the coldest possible temperature, where all motion stops) and uses the same scale as Celsius but shifted by 273.15. It is used in physics and engineering because it has no negative values.

### How accurate is this?

Conversions are exact up to floating-point precision. The formulas used: °C to °F = (°C × 9/5) + 32; °F to °C = (°F - 32) × 5/9; K to °C = K - 273.15.

### Why is there no negative Kelvin?

Because Kelvin is an absolute scale: 0 K is the coldest possible temperature (absolute zero). You cannot go below 0 K. The tool shows the conversion but flags negative Kelvin as physically impossible.

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For the full HTML page with the live tool, visit https://uttir.com/temperature-converter.
This file is the markdown rendering at https://uttir.com/temperature-converter.md. See https://uttir.com/llms.txt for a site-wide summary.