Convert Fahrenheit to Celsius
1 fahrenheit = -17.222222 celsius (°F to °C).
The fahrenheit and the celsius are two different temperature scales, so converting between them means shifting and rescaling the reading rather than multiplying by a single factor. On this page a fahrenheit reading of 1° works out to -17.2222 celsius. Enter any value above to convert it instantly, and use the chart below for the readings people look up most.
1 °F = -17.222222 °C
How to convert Fahrenheit to Celsius
Formula: °C = (°F − 32) × 5/9
Example: 10 fahrenheit = -12.2222 celsius.
Going the other direction — Fahrenheit to Celsius — uses °C = (°F − 32) × 5/9. The subtraction of 32 must happen first; skipping it is the single most common calculation error. A body temperature of 98.6 °F converts to exactly 37 °C, a figure chosen as the Fahrenheit equivalent of what Celsius later standardised as normal human body temperature.
Weather is the everyday flashpoint for Americans travelling abroad or reading international news. A heat advisory at 100 °F is 37.8 °C; a pleasant spring day at 68 °F is 20 °C. The mental shortcut of 'subtract 30, halve it' (e.g. 80 °F → 50 → 25 °C) is accurate to within a couple of degrees and useful when a calculator is not handy.
Refrigeration and food safety have specific thresholds. The USDA danger zone runs from 40 °F to 140 °F, which is 4.4 °C to 60 °C — rounded to 4 °C and 60 °C in most international food-safety guidance. Fridge temperatures should stay at or below 40 °F (4 °C); freezer temperatures at 0 °F correspond to −17.8 °C, which is why most metric freezers are set to −18 °C.
A practical gotcha: Fahrenheit uses finer graduations than Celsius for everyday ranges, which can give a false sense of precision. A fever of 100.4 °F (38 °C) and 101.3 °F (38.5 °C) feel like meaningfully different readings in Fahrenheit but are just half a Celsius degree apart.
Fahrenheit to Celsius Conversion Chart
| Fahrenheit | Celsius |
|---|---|
| 1 °F | -17.222222 °C |
| 2 °F | -16.666667 °C |
| 3 °F | -16.111111 °C |
| 5 °F | -15 °C |
| 10 °F | -12.222222 °C |
| 20 °F | -6.6666667 °C |
| 25 °F | -3.8888889 °C |
| 50 °F | 10 °C |
| 100 °F | 37.777778 °C |
| 1000 °F | 537.77778 °C |
Frequently Asked Questions
- How many celsius are in a fahrenheit?
- There are -17.222222 celsius in 1 fahrenheit.
- How do you convert fahrenheit to celsius?
- Formula: °C = (°F − 32) × 5/9
- What is 5 fahrenheit in celsius?
- 5 fahrenheit equals -15 celsius.
- What is 100 fahrenheit in celsius?
- 100 fahrenheit equals 37.777778 celsius.
- What is 1 celsius in fahrenheit?
- 1 celsius equals 33.8 fahrenheit.
- Is this fahrenheit to celsius converter free?
- Yes. The converter is free, needs no sign-up, and runs entirely in your browser — the values you enter never leave your device.