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Celsius to Fahrenheit Converter

Convert Celsius and Fahrenheit for weather, recipes, and product manuals. The formulas are °F = (°C × 9/5) + 32 and °C = (°F − 32) × 5/9.

Left

°C

Celsius value

Converted to °F–°F = (°C × 9/5) + 32

Right

°F

Fahrenheit value

Converted to °C–°C = (°F − 32) × 5/9

Kelvin–K

Rankine–°R

Status–temperature

Basis9/5 + 32formula

To convert Celsius to Fahrenheit, multiply by 9/5 and add 32. To convert Fahrenheit to Celsius, subtract 32 and multiply by 5/9.

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Read Celsius, Fahrenheit, Kelvin, and Rankine together

Weather may be written in Celsius, while recipes, ovens, and overseas product notes may use Fahrenheit. This page converts Celsius and Fahrenheit both ways and keeps Kelvin, Rankine, and a short status note nearby.

The formulas are °F = (°C × 9/5) + 32 and °C = (°F − 32) × 5/9. Kelvin is °C + 273.15, and values below absolute zero are not accepted.

Use it in screen order

Enter °C when your source is weather, lab, or metric product text. °F, K, and °R update together.
Enter °F when a recipe, oven, or overseas note uses Fahrenheit. The Celsius result appears first for comparison.
For medical, cooking, or lab use, read the rounded value together with the equipment display unit.

Worked examples

Temperature conversion is not a plain ratio because Fahrenheit has a 32-degree offset.

0 °C entered(0 × 9/5) + 32 = 32 °F, 273.15 K

25 °C entered25 °C = 77 °F, a common room-temperature example

100 °F entered(100 − 32) × 5/9 = 37.78 °C

What each unit is for

°C is the usual weather, daily, and science-education temperature unit in Korea and most metric contexts.
°F appears in US weather, ovens, and some product manuals.
K is absolute temperature, used in science and engineering, and cannot go below 0 K.
°R is an absolute scale based on Fahrenheit, mostly useful in engineering references.

Rounding and cautions

Values below absolute zero are physically invalid, so the tool stops them.
For medical, oven, or experiment settings, follow the needed precision and the device’s own display unit.
For casual weather notes, rounding is fine, but keep whether the source was °C or °F.

FAQ

What is 0 °C in Fahrenheit?

0 °C is 32 °F.

What is 25 °C in Fahrenheit?

25 °C is 77 °F.

What is 100 °F in Celsius?

100 °F is about 37.78 °C.

Does the tool calculate below absolute zero?

No. It rejects values below -273.15 °C or -459.67 °F.

Why show Kelvin?

Kelvin is useful when a scientific or product specification needs absolute temperature.

Reference

NIST Handbook 44 Appendix C includes the Celsius and Fahrenheit conversion formulas.

BasisNIST Appendix C