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العربيةTemperature converter — Celsius, Fahrenheit and Kelvin
Temperature is the one family where units do not simply scale — each has its own zero — so this converter takes a single value and rewrites it on every scale, including the two historical ones.
How to use it
- 1
Pick the scale your number is written in — the chips above the input.
- 2
Type the value. Decimals and negative numbers are fine, and a comma works as a decimal point.
- 3
Read every other scale on the right. Click any result to copy it.
Exact conversion factors
These are the definitions the calculator uses. Nothing here is rounded for convenience — where a value is exact by definition, it says so.
- 0 °C = 32 °F = 273.15 K — water freezes
- 100 °C = 212 °F = 373.15 K — water boils at 1 atm
- −273.15 °C = −459.67 °F = 0 K — absolute zero
- −40 °C = −40 °F — the one point where both scales agree
- 37 °C = 98.6 °F — normal body temperature
°F = °C × 9/5 + 32 · °C = (°F − 32) × 5/9 · K = °C + 273.15 · °R = (°C + 273.15) × 1.8Temperature conversion table — every unit
One of each unit, converted into the three units people ask for most.
| °C | °F | K |
|---|---|---|
| -40 °C | -40 °F | 233.15 K |
| -18 °C | -0.4 °F | 255.15 K |
| 0 °C | 32 °F | 273.15 K |
| 20 °C | 68 °F | 293.15 K |
| 37 °C | 98.6 °F | 310.15 K |
| 100 °C | 212 °F | 373.15 K |
| 180 °C | 356 °F | 453.15 K |
| 200 °C | 392 °F | 473.15 K |
How this converter works
Pick the scale you are reading from, type the number, and the rest fill in. Negative values, decimals and the awkward ones like −40 (identical in Celsius and Fahrenheit) all work.
The arithmetic, if you want to do it by hand: °F = °C × 9/5 + 32, and K = °C + 273.15. Rankine is the Fahrenheit-sized cousin of Kelvin, used in some US thermodynamics work; Réaumur is a historical scale with water boiling at 80° that still turns up in old recipes and cheese-making instructions.
Notes and abbreviations
- 0 °C = 32 °F = 273.15 K — water freezes
- 100 °C = 212 °F = 373.15 K — water boils at sea level
- −273.15 °C = 0 K — absolute zero, the floor of the Kelvin scale
- −40 °C = −40 °F — the single point where the two scales agree
Questions
What is a fever of 38.5 °C in Fahrenheit?
101.3 °F. Normal body temperature, 36.6 °C, is 97.88 °F.
Is it 273 or 273.15?
The exact offset is 273.15. The rounded 273 is fine for rough work but drifts in precise calculations.
What oven temperature is gas mark 6?
About 200 °C, which this page shows as 392 °F and 473.15 K.