Fahrenheit to Celsius
Convert °F to °C instantly.
Celsius (°C)
100
Conversion table
| °F | °C |
|---|---|
| -40°F | -40°C |
| -22°F | -30°C |
| -4°F | -20°C |
| 14°F | -10°C |
| 32°F | 0°C |
| 41°F | 5°C |
| 50°F | 10°C |
| 59°F | 15°C |
| 68°F | 20°C |
| 77°F | 25°C |
| 86°F | 30°C |
| 95°F | 35°C |
| 98.6°F | 37°C |
| 104°F | 40°C |
| 122°F | 50°C |
| 140°F | 60°C |
| 158°F | 70°C |
| 176°F | 80°C |
| 194°F | 90°C |
| 212°F | 100°C |
| 250°F | 121.11°C |
| 300°F | 148.89°C |
| 325°F | 162.78°C |
| 350°F | 176.67°C |
| 400°F | 204.44°C |
| 450°F | 232.22°C |
| 482°F | 250°C |
How to convert Fahrenheit to Celsius
The formula is °C = (°F − 32) × 5/9. Water freezes at 32 °F (0 °C) and boils at 212 °F (100 °C). Body temperature is 98.6 °F = 37 °C. The two scales are equal at −40°. Need the reverse? Celsius to Fahrenheit →
Built and maintained by Meet Shah · Last updated
What this tool is used for
- Converting a US weather figure into the units the rest of a report uses.
- Reading an imperial appliance setting against a metric specification.
- Converting a temperature from an American recipe for a metric oven.
- Checking a US datasheet's operating range against a metric requirement.
- Converting a clinical temperature quoted in Fahrenheit for a metric chart.
Frequently Asked Questions
- What is the formula?
- C = (F − 32) × 5/9. Subtract FIRST, then scale — reversing the order is the classic bug and produces answers that look plausible in the middle of the range while being badly wrong at the extremes.
- Is there a quick mental approximation?
- Subtract 30 and halve: 70°F → about 20°C (true value 21.1°C). It is accurate to a degree or two across normal weather temperatures and diverges badly outside them, so it is fine for weather and useless for cooking or medicine.
- What are the body-temperature reference points?
- 98.6°F is 37°C — but that precision is spurious. It came from converting a 19th-century measurement of 37°C, and the extra decimal implies an accuracy the original never had. Modern studies put the average nearer 36.6°C.
- How do I go on to Kelvin?
- Convert to Celsius first, then add 273.15. Kelvin uses the same degree size as Celsius, so only the offset changes — which is why scientific work converts through Celsius rather than directly from Fahrenheit.
- What is the Rankine scale?
- Absolute zero expressed in Fahrenheit-sized degrees: R = F + 459.67. It appears in some US engineering thermodynamics, and it is to Fahrenheit exactly what Kelvin is to Celsius.
Common errors and gotchas
- Subtracting 32 after multiplying rather than before, which produces a wildly wrong answer.
- Applying the offset to a difference between two Fahrenheit readings, where it does not belong.
- Rounding the intermediate value, which the 5/9 factor then magnifies.
- Reading a negative Fahrenheit value as an error, when the scale runs well below zero normally.
- Confusing a Fahrenheit degree with a Celsius degree as a unit of change, since they are different sizes.
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