20 degrees Fahrenheit to degrees Celsius
20 degrees Fahrenheit = -6.6667 degrees Celsius
Formula: degrees Celsius = (degrees Fahrenheit - 32) x 5/9
Twenty degrees Fahrenheit is a hard-freeze morning in the US, and converting it to Celsius helps international readers understand the cold.
How to Convert degrees Fahrenheit to degrees Celsius
Fahrenheit converts to Celsius with an affine formula because the scales have different zero points. You subtract 32 from the Fahrenheit value and then multiply by 5/9. The scales coincide only at minus forty degrees, where both read the same number.
The formula is degrees Celsius = (degrees Fahrenheit - 32) x 5/9. Apply the formula to 20 degrees Fahrenheit: 20 - 32 = -12, then -12 x 5/9 = -6.6667 degrees Celsius.
The reverse is just as direct: -6.6667 degrees Celsius equals 20 degrees Fahrenheit. That symmetry is a quick way to sanity-check any conversion you make.
degrees Fahrenheit to degrees Celsius Conversion Table
Use this table to read off nearby values at a glance. The highlighted row is the 20-degrees Fahrenheit conversion from this page.
| degrees Fahrenheit | degrees Celsius |
|---|---|
| 0 | -17.7778 |
| 10 | -12.2222 |
| 20 | -6.6667 |
| 30 | -1.1111 |
| 40 | 4.4444 |
| 50 | 10 |
| 60 | 15.5556 |
| 70 | 21.1111 |
| 80 | 26.6667 |
| 90 | 32.2222 |
| 100 | 37.7778 |
Reverse: degrees Celsius to degrees Fahrenheit
Need to go the other way? -6.6667 degrees Celsius converts back to 20 degrees Fahrenheit. For the full breakdown in that direction, see 20 degrees Celsius to degrees Fahrenheit.
Frequently Asked Questions
How do I convert 20 degrees Fahrenheit to degrees Celsius?
20 degrees Fahrenheit equals -6.6667 degrees Celsius. You subtract 32 and multiply by 5/9 to get there, because the two scales start from different zero points and so are not simply proportional.
Why does temperature need an extra add or subtract?
Because the scales are offset, not just stretched. Each has a different zero, so you must scale and then shift. The single point where both scales show the same number is minus forty degrees, a useful sanity check.
What is -6.6667 degrees Celsius back in degrees Fahrenheit?
Reversing the formula returns 20 degrees Fahrenheit, your starting temperature. The unit conversion calculator linked below handles any Celsius or Fahrenheit value.
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Disclaimer: This calculator is for informational and educational purposes only. Results are estimates and may not reflect exact values.
Last updated: June 13, 2026