Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin and Rankine. Pick any two scales; it runs entirely in your browser.
Temperature scales differ in two ways — the size of one degree and where zero sits — so every
conversion is a multiply-and-add, not a single ratio. The core relationships are
°F = °C × 1.8 + 32, K = °C + 273.15 and °R = °F + 459.67,
and the live tool above uses these exact formulas.
Popular temperature conversions
The temperature scales
| Scale | What it is |
|---|---|
| Celsius (°C) | Celsius (centigrade) puts 0° at the freezing point of water and 100° at its boiling point at sea level. It is the everyday temperature scale used almost everywhere outside the United States. |
| Fahrenheit (°F) | Fahrenheit puts water’s freezing point at 32° and its boiling point at 212° — a 180-degree span. It is the everyday scale in the United States and a few other territories. |
| Kelvin (K) | The 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, so it is written without a degree sign. |
| Rankine (°R) | The Rankine scale starts at absolute zero like Kelvin but uses the Fahrenheit-sized degree (0 °R = −459.67 °F). It appears in some US engineering and thermodynamics work. |