°F to °C conversion
Convert Fahrenheit to Celsius with the exact formula rather than a rounded factor. formula °C = (°F − 32) × 5/9 (exact).
degrees Fahrenheit to degrees Celsius
Computed with the exact factor · SI definitions
| Fahrenheit | Celsius |
|---|---|
| 0 °F | -17.78 °C |
| 50 °F | 10 °C |
| 100 °F | 37.78 °C |
| 150 °F | 65.56 °C |
| 200 °F | 93.33 °C |
| 250 °F | 121.11 °C |
| 300 °F | 148.89 °C |
| 350 °F | 176.67 °C |
| 400 °F | 204.44 °C |
| 450 °F | 232.22 °C |
Exact factor details
- Exact factor
- formula °C = (°F − 32) × 5/9 (exact)
- Significant digits
- up to 4 significant digits shown
- Data source
- SI definitions — verified against official tables
Why °F to °C trips people up
Temperature conversions between Celsius and Fahrenheit. Unlike length or weight, temperature scales have different zero points, so converting uses a formula rather than a single factor: °F = °C × 9/5 + 32. Fahrenheit sets water's freezing point at 32 and boiling point at 212. Celsius sets water's freezing point at 0 and boiling point at 100.
The Celsius scale places water's freezing point at 0 and its boiling point at 100 at standard pressure; Fahrenheit places the same events at 32 and 212. The two scales meet at exactly −40 degrees — a handy checkpoint for verifying any conversion. For baking, note that most ovens mark settings in 25-degree steps, so converted temperatures are usually rounded to the nearest 10 or 25.
Use the quick-reference table for the amounts people actually look up, and the converter above for everything in between. Both are computed from the same factor at full precision, so the table and the converter can never disagree — there is no second, rounded copy of the data anywhere on this page.
Frequently asked questions
Is the °F to °C conversion exact?
Yes. The conversion between Celsius and Fahrenheit uses exact formulas (°F = °C × 9/5 + 32), so any difference in results comes only from rounding for display.
How do I convert °F to °C in my head?
Subtract 32, then halve the result. Example: 68 °F → 36 ÷ 2 = 18, close to the exact 20 °C.
Why do other sites show slightly different °F to °C results?
They round at different steps. This page computes with the full-precision factor and rounds only the final displayed number, so small trailing digits can differ from sites that round earlier.