Celsius to Fahrenheit Converter

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Convert Celsius to Fahrenheit using the standard affine formula F = C × 9/5 + 32. Anchors: water freezes at 0 °C = 32 °F, room temperature is 20–22 °C ≈ 68–72 °F, body temperature 37 °C = 98.6 °F, water boils at 100 °C = 212 °F. Useful for reading European weather forecasts and recipe temperatures in US-style °F. Browser-local.

Celsius (°C)
Fahrenheit (°F)

Celsius (°C) → Fahrenheit (°F)

Quick reference table

Celsius (°C)Fahrenheit (°F)
-40 °C-40 °F
-20 °C-4 °F
0 °C32 °F
10 °C50 °F
20 °C68 °F
25 °C77 °F
37 °C98.6 °F
40 °C104 °F
60 °C140 °F
100 °C212 °F

Glossary

Celsius (°C)

Celsius is the metric temperature scale where the freezing point of water at standard atmospheric pressure is defined as 0 °C and the boiling point as 100 °C. Introduced by Anders Celsius in 1742 (originally with the scale inverted), it is now the everyday unit in nearly every country, in scientific notation alongside Kelvin, and the dominant unit for weather forecasts outside the US.

Fahrenheit (°F)

Fahrenheit is the imperial temperature scale used in everyday life in the United States, where water freezes at 32 °F and boils at 212 °F. Introduced by Daniel Gabriel Fahrenheit in 1724, the scale was originally calibrated against a brine ice mixture and human body temperature. Convert with F = C × 9/5 + 32 or C = (F − 32) × 5/9.

Metric / SI temperature

In the metric system, temperature is reported in degrees Celsius (everyday) or Kelvin (scientific). The two scales share the same step size — one Kelvin equals one degree Celsius — and differ only by the constant 273.15: T(K) = T(°C) + 273.15. The Kelvin scale starts at absolute zero, while Celsius is anchored to the freezing point of water at standard pressure.

Imperial / US Customary temperature

In the United States, everyday temperature is reported in degrees Fahrenheit, where water freezes at 32 °F and boils at 212 °F. The Rankine scale (absolute, anchored at 0 °R = absolute zero with the Fahrenheit step) is occasionally used in US thermodynamics and aerospace engineering. The conversion between Celsius and Fahrenheit uses the affine formula F = C × 9/5 + 32.

Related tools

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