What is 350 °F in Celsius?

176.666667 °C. Ovens are not that precise, so 175 °C on a dial marked in fives, or 180 °C on one marked in tens, is what recipes mean in practice.

When is a fever a fever?

100.4 °F is 38 °C, the threshold most health services use. Below that, 99 °F is 37.222222 °C, which is within the normal daily swing for many people.

Why is the divisor 1.8 rather than 5/9?

They are the same number written differently: dividing by 1.8 equals multiplying by 5/9. NIST prints the relation with 1.8, so that is the form this page uses and tests against.

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Fahrenheit to Celsius

Convert Fahrenheit to Celsius using the exact relation published by NIST, computed in your browser with no detour through kelvin.

°C = (°F − 32) ÷ 1.8

NIST SP 811 (2008), Appendix B.8 — degree Fahrenheit (temperature) (°F) to degree Celsius (°C): t/°C = (t/°F − 32)/1.8

Recipes and American weather reports are the two reasons most people need this direction. Oven temperatures are the awkward case, because they are traditionally quoted in round numbers that do not survive conversion: 350 °F is 176.67 °C, which every European oven rounds to 175 or 180. The relation itself is exact and comes straight from the standard.

How it is calculated

°C = (°F − 32) ÷ 1.8

This is the expression exactly as NIST prints it. Subtracting the offset first and dividing afterwards keeps the freezing point landing on precisely zero instead of a value a hair away from it.

Source: NIST SP 811 (2008), Appendix B.8 — degree Fahrenheit (temperature) (°F) to degree Celsius (°C): t/°C = (t/°F − 32)/1.8

Common values

degrees Fahrenheit	degrees Celsius
-40	-40
0	-17.777778
32	0
50	10
68	20
72	22.222222
98.6	37
212	100
350	176.66667
400	204.44444
450	232.22222

Questions people ask

What is 350 °F in Celsius?: 176.666667 °C. Ovens are not that precise, so 175 °C on a dial marked in fives, or 180 °C on one marked in tens, is what recipes mean in practice.
When is a fever a fever?: 100.4 °F is 38 °C, the threshold most health services use. Below that, 99 °F is 37.222222 °C, which is within the normal daily swing for many people.
Why is the divisor 1.8 rather than 5/9?: They are the same number written differently: dividing by 1.8 equals multiplying by 5/9. NIST prints the relation with 1.8, so that is the form this page uses and tests against.

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