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Celsius to Fahrenheit

Convert °C to °F — or °F to °C — as you type, with the formula and a handy reference chart.

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How to use Celsius to Fahrenheit

  1. 1Type a temperature in Celsius to see it in Fahrenheit.
  2. 2Or type in the Fahrenheit box to convert the other way — both boxes update each other.
  3. 3Check the formula shown below the result.
  4. 4Use the chart for common temperatures such as room temperature, body temperature and oven settings.

Celsius and Fahrenheit, both ways

Most of the world measures temperature in degrees Celsius, while the United States and a few other countries use Fahrenheit. Recipes, weather forecasts, thermostats, medical thermometers and science homework often need converting between the two. Type a value into either box and the other updates instantly — no need to choose a direction.

The formulas

Conversion Formula Example
Celsius → Fahrenheit °F = °C × 9/5 + 32 25 °C × 1.8 + 32 = 77 °F
Fahrenheit → Celsius °C = (°F − 32) × 5/9 (77 °F − 32) × 5/9 = 25 °C

The two scales use different zero points — water freezes at 0 °C and 32 °F — and a different size of degree: 1 °C is 1.8 °F. That's why you can't simply multiply; you also have to shift by 32.

Useful reference temperatures

What Celsius Fahrenheit
Water freezes 0 °C 32 °F
Cold winter day −10 °C 14 °F
Cool spring day 15 °C 59 °F
Room temperature 20–22 °C 68–72 °F
Hot summer day 35 °C 95 °F
Normal body temperature 37 °C 98.6 °F
Fever 38 °C 100.4 °F
Water boils (sea level) 100 °C 212 °F

Oven temperatures

Description Celsius Fahrenheit Gas mark
Low / slow cooking 150 °C 300 °F 2
Moderate 180 °C 350 °F 4
Moderately hot 200 °C 400 °F 6
Hot 220 °C 425 °F 7
Very hot 240 °C 475 °F 9

Recipes usually round oven temperatures, so 180 °C is written as 350 °F even though the exact value is 356 °F. For fan (convection) ovens, reduce the temperature by about 20 °C or 25 °F.

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Frequently asked questions

How do I convert Celsius to Fahrenheit?
Multiply by 9/5 (or 1.8) and add 32. For 20 °C: 20 × 1.8 = 36, and 36 + 32 = 68 °F.
How do I convert Fahrenheit to Celsius?
Subtract 32 and multiply by 5/9. For 98.6 °F: 98.6 − 32 = 66.6, and 66.6 × 5/9 = 37 °C.
Is there a quick way to estimate it in my head?
Double the Celsius value and add 30. 15 °C → 30 + 30 = 60 °F (exact: 59 °F). It is close for everyday weather temperatures but less accurate at very high or low values. To go the other way, subtract 30 and halve.
At what temperature are Celsius and Fahrenheit the same?
At −40. −40 °C is exactly −40 °F, which is the only point where both scales meet.
What is normal body temperature in Fahrenheit?
About 37 °C, which is 98.6 °F. Normal readings vary between about 36.1 °C and 37.2 °C (97 °F to 99 °F) depending on the person, the time of day and where it is measured. 38 °C (100.4 °F) or higher is generally considered a fever.

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