Fahrenheit to Celsius Converter
Quick answer: Fahrenheit to Celsius: use °C = (°F − 32) × 5/9. For example, 37 °F is 2.777778 °C.
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Use the Fahrenheit to Celsius Converter
Fahrenheit to Celsius formula and what each symbol means
°C = (°F − 32) × 5/9
| Symbol | Meaning |
|---|---|
| °F | Degree Fahrenheit |
| °C | Degree Celsius |
Fahrenheit to Celsius examples
0 °F
0 °F = -17.77778 °C.
37 °F
37 °F = 2.777778 °C.
100 °F
100 °F = 37.77778 °C.
Fahrenheit compared with Celsius
These two scales agree at exactly -40: -40 °F = -40 °C. Use that fixed point as a quick sanity check on any result.
About Fahrenheit and Celsius
Degree Fahrenheit (°F): Fahrenheit degree used mainly in the United States: water freezes at 32 °F and boils at 212 °F. Degree Celsius (°C): Celsius degree: 0 °C is the freezing point of water and a step of 1 °C equals 1 K.
Where Fahrenheit to Celsius conversions are used
Weather forecasts, ovens and body temperature use different scales depending on the country. Science and engineering work in kelvin, because it starts at absolute zero.
How to calculate Fahrenheit to Celsius step by step
- Enter the value in °F.
- Apply the formula °C = (°F − 32) × 5/9.
- The result is in °C. Use the reverse formula to go back.
Popular temperature conversions
How to read your Fahrenheit to Celsius result
Mental shortcut: subtract 30 from the Fahrenheit value and halve it for a quick Celsius estimate (within 2 °C between 32 °F and 86 °F). Water freezes at 0 °C, 32 °F and 273.15 K, and boils at 100 °C, 212 °F and 373.15 K at standard pressure.
| FAHRENHEIT | CELSIUS |
|---|---|
| -40 | -40 |
| -10 | -23.33333 |
| 0 | -17.77778 |
| 20 | -6.666667 |
| 37 | 2.777778 |
| 50 | 10 |
| 100 | 37.77778 |
| 212 | 100 |
Celsius to Fahrenheit: quick table
| CELSIUS | FAHRENHEIT |
|---|---|
| -40 | -40 |
| -10 | 14 |
| 0 | 32 |
| 15 | 59 |
| 25 | 77 |
| 37 | 98.6 |
| 60 | 140 |
| 90 | 194 |
Common mistakes when calculating Fahrenheit to Celsius
- Multiplying by 1.8 but forgetting to add 32 when converting Celsius to Fahrenheit.
- Using a single multiplier: this conversion is not a simple scale, so follow the full formula °C = (°F − 32) × 5/9.
Fahrenheit to Celsius FAQ
What is the formula to convert Fahrenheit to Celsius?
°C = (°F − 32) × 5/9.
What is the formula to convert Celsius to Fahrenheit?
°F = °C × 9/5 + 32.
What is 0 °F in °C?
0 °F equals -17.77778 °C.
What is a degree Celsius (°C)?
Celsius degree: 0 °C is the freezing point of water and a step of 1 °C equals 1 K.
How can I estimate Fahrenheit to Celsius in my head?
Mental shortcut: subtract 30 from the Fahrenheit value and halve it for a quick Celsius estimate (within 2 °C between 32 °F and 86 °F).
What is 30 °F in Celsius?
30 °F = -1.111111 °C, using °C = (°F − 32) × 5/9.
What is 15 °F in Celsius?
15 °F = -9.444444 °C, using °C = (°F − 32) × 5/9.
What is 90 °F in Celsius?
90 °F = 32.22222 °C, using °C = (°F − 32) × 5/9.
How many decimals should I keep when converting °F to °C?
Match the precision of your original measurement. For example, 2.777778 °C rounds to 2.78 °C at 3 significant figures; keep more digits only for engineering or scientific work.
More in Temperature converters
- Kelvin to Celsius Converter
- Kelvin to Fahrenheit Converter
- Kelvin to Rankine Converter
- Rankine to Kelvin Converter
- Rankine to Celsius Converter
- Rankine to Fahrenheit Converter
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Method, review and disclaimer
Edited by: Hemant Kumar and Anjita Rai, founders of ToolsVault (SEO and content professional, not a licensed adviser). Method: this tool runs in your browser using the formula shown on this page; the numbers you enter are not sent to our servers. Sources: NIST SP 811, Appendix B.8: conversion factors, BIPM: the kelvin