Celsius to Fahrenheit Converter (°C to °F)

Temperature scales do not share a zero, so this conversion needs an offset as well as a ratio: multiply Celsius by 9/5 and add 32 for Fahrenheit, or subtract 32 from Fahrenheit and multiply by 5/9 for Celsius.

The two scales meet at −40, the only temperature that reads the same on both. Weather forecasts, oven settings and thermostat readings are the usual reasons to convert.

How to use this tool

1. Type a value in the Celsius box to see it in degrees Fahrenheit, or type in the Fahrenheit box to convert the other way.
2. Press ⇄ to swap the two units, or Load example for a typical value.
3. Check the charts below for common values; for other units, open the Temperature converter.

Formula

°F = °C × 9/5 + 32

°C = (°F − 32) × 5/9

The scales have different zero points, so the formula adds or subtracts an offset as well as multiplying.

Example

Two conversions worked with the same factors the converter uses:

37 °C = 98.6 °F

350 °F ≈ 176.667 °C

Celsius to Fahrenheit chart

Common values from degrees Celsius to degrees Fahrenheit, rounded to four decimal places.

Fahrenheit to Celsius chart

The reverse direction for values people often look up.

Reference temperatures

Everyday reference points on both scales. Boiling and freezing points are for pure water at standard sea-level pressure; room and body temperatures are typical values, not fixed ones.

Quick mental estimate

Double the Celsius figure and add 30: 20 °C → 70 °F. It is close for mild weather but drifts at the extremes, because the exact factor is 1.8, not 2.

Use the converter or the charts when the exact figure matters.

The two units

Celsius (°C): Celsius temperature is the kelvin value minus exactly 273.15. At standard atmospheric pressure, pure water freezes near 0 °C and boils near 100 °C; these water temperatures are reference points, not the modern definition of the scale.

Fahrenheit (°F): Fahrenheit temperature is defined by °F = °C × 9/5 + 32. Thus 0 °C equals exactly 32 °F, 100 °C equals exactly 212 °F, and absolute zero is −459.67 °F.