# Temperature converter

> Enter a temperature in any unit — Celsius, Fahrenheit, Kelvin, or Rankine — and see the equivalent in all others instantly.

Convert between Celsius, Fahrenheit, Kelvin, and Rankine instantly. See all four units at once.

**Interactive version:** https://onlinecalculator.me/unit-converters/temperature/
**Category:** Unit Converters

## Conversion formulas

| From | To | Formula |
|------|----|---------|
| Celsius | Fahrenheit | °F = °C × 9/5 + 32 |
| Fahrenheit | Celsius | °C = (°F − 32) × 5/9 |
| Celsius | Kelvin | K = °C + 273.15 |
| Kelvin | Celsius | °C = K − 273.15 |
| Celsius | Rankine | °R = (°C + 273.15) × 9/5 |
| Fahrenheit | Rankine | °R = °F + 459.67 |

## Reference points

| Point | °C | °F | K | °R |
|-------|----|----|---|---|
| Absolute zero | −273.15 | −459.67 | 0 | 0 |
| Water freezes | 0 | 32 | 273.15 | 491.67 |
| Body temperature | 37 | 98.6 | 310.15 | 558.27 |
| Water boils | 100 | 212 | 373.15 | 671.67 |

## Frequently asked questions

### How do you convert Celsius to Fahrenheit?

°F = (°C × 9/5) + 32. So 100°C = 212°F and 0°C = 32°F.

### How do you convert Fahrenheit to Celsius?

°C = (°F − 32) × 5/9. So 98.6°F = 37°C.

### What is Kelvin?

Kelvin is the SI base unit of temperature. It starts at absolute zero (0 K = −273.15°C) and uses the same degree size as Celsius. Water freezes at 273.15 K and boils at 373.15 K.

### What is Rankine?

Rankine is an absolute temperature scale like Kelvin but based on Fahrenheit degrees. 0°R = absolute zero. Water freezes at 491.67°R and boils at 671.67°R.

### How do I share my conversion?

Click "Share with my numbers" to copy a URL that restores your value and units.

## Sources

- [SI Units — Temperature (kelvin, Celsius, conversions)](https://www.nist.gov/pml/owm/si-units-temperature) — National Institute of Standards and Technology
- [Fahrenheit — scale and Celsius conversion formulas](https://en.wikipedia.org/wiki/Fahrenheit) — Wikipedia
- [Kelvin — SI base unit of temperature](https://en.wikipedia.org/wiki/Kelvin) — Wikipedia

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