Temperature Converter

Convert temperatures between Fahrenheit, Celsius and Kelvin in any direction. The converter also warns you if a value falls below absolute zero.

FreeNo sign-upInstant resultsUpdated: October 22, 2026

Converter

Value

From

Degrees Fahrenheit

77 °F

25 °C = 77 °F

Rounded to 2 decimal places: 77 °F
Rounded to 4 decimal places: 77 °F
Full value: 77 °F

Quick chart: degrees Celsius to degrees Fahrenheit

-40 °C = -40 °F

-18 °C = -0.4 °F

0 °C = 32 °F

20 °C = 68 °F

25 °C = 77 °F

37 °C = 98.6 °F

100 °C = 212 °F

180 °C = 356 °F

200 °C = 392 °F

°F = °C × 9/5 + 32 · K = °C + 273.15. Nothing can be colder than absolute zero: 0 K = −273.15 °C = −459.67 °F.

Keep analyzing

For estimates only. Double-check the numbers before making important decisions.

Temperature conversion formulas

°C = (°F − 32) × 5/9
°F = °C × 9/5 + 32
K = °C + 273.15
°C = K − 273.15
K = (°F − 32) × 5/9 + 273.15
°F = (K − 273.15) × 9/5 + 32

9/5 is the same as 1.8, so °F = °C × 1.8 + 32. The order matters: when going from Fahrenheit to Celsius, subtract 32 first, then multiply.

Reference temperatures

Reference point	°F	°C	K
Absolute zero	−459.67	−273.15	0
Fahrenheit equals Celsius	−40	−40	233.15
0 °F	0	−17.78	255.37
Water freezes	32	0	273.15
Room temperature	68–72	20–22.22	293.15–295.37
Normal body temperature	98.6	37	310.15
Fever threshold	100.4	38	311.15
Water boils (sea level)	212	100	373.15

Oven temperatures

°F	°C (exact)	°C (as usually printed)
325 °F	162.78 °C	160 °C
350 °F	176.67 °C	180 °C
375 °F	190.56 °C	190 °C
400 °F	204.44 °C	200 °C
425 °F	218.33 °C	220 °C
450 °F	232.22 °C	230 °C

Recipes round to the nearest 10 °C, and most ovens vary by more than that, so the rounded value is fine for baking.

Absolute zero and Kelvin

Absolute zero, 0 K, is the lowest temperature possible. That's why Kelvin values are never negative and are written without a degree sign (300 K, not 300 °K). One kelvin is the same size as one degree Celsius, so a change of 10 °C is also a change of 10 K, and a change of 18 °F.

Common uses

Weather forecasts when traveling abroad.
Recipes and oven settings from metric cookbooks.
Body temperature from a thermometer set to Celsius.
Physics, chemistry and engineering, which use Kelvin.

Example

77 °F is 25 °C and 298.15 K. A fever of 100.4 °F is 38 °C. At −40, the Fahrenheit and Celsius scales read the same.

(77 − 32) × 5/9 = 45 × 5/9 = 25 °C
25 + 273.15 = 298.15 K
(100.4 − 32) × 5/9 = 68.4 × 5/9 = 38 °C
−40 × 9/5 + 32 = −72 + 32 = −40 °F

Common mistakes

Multiplying by 9/5 and forgetting to add 32, or subtracting 32 after multiplying instead of before.
Converting a temperature difference with the full formula. A rise of 10 °C is a rise of 18 °F, not 50 °F.
Writing "degrees Kelvin" or using negative Kelvin values. It's just kelvins, and the scale starts at 0.

Frequently asked questions

How do I convert Fahrenheit to Celsius?

Subtract 32, then multiply by 5/9. For 72 °F: (72 − 32) × 5/9 = 22.22 °C.

What is 0 Kelvin in Fahrenheit?

0 K is −459.67 °F, which is also −273.15 °C. It's absolute zero, the coldest possible temperature.

Is there a quick way to convert Celsius to Fahrenheit in my head?

Double the Celsius value and add 30. For 20 °C that gives 70 °F (the exact answer is 68 °F). For an exact result, multiply by 1.8 and add 32.

What is 350 °F in Celsius?

350 °F is 176.67 °C. Recipes usually round it to 180 °C.

At what temperature are Fahrenheit and Celsius equal?

At −40. −40 °F and −40 °C are exactly the same temperature.

Why can't Kelvin go below zero?

Because 0 K is absolute zero, the point at which particles have the minimum possible energy. There's nothing colder, so the scale has no negative values.

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