🌡️ Fahrenheit to Celsius Converter
Convert Fahrenheit temperatures to Celsius, both directions.
About this tool
Converts Fahrenheit readings to Celsius using C = (F − 32) × 5/9, the exact inverse of the standard Celsius-to-Fahrenheit formula.
Common uses: reading a US recipe or oven dial when you think in Celsius, or checking a weather forecast from a Fahrenheit-first source.
Worked example
98.6°F (normal body temperature) converts to 37°C, and 72°F room temperature is about 22.2°C.
How to use it
- Enter a temperature in Fahrenheit.
- The Celsius equivalent appears instantly.
- Swap direction to convert Celsius back to Fahrenheit.
Tips
- A quick mental estimate: subtract 32, then roughly halve it — not exact, but close for casual conversation.
- Fever thresholds are often quoted in Fahrenheit in the US (100.4°F) — that's about 38°C.
- For baking, always use the exact conversion, not the mental shortcut — a few degrees matters.
FAQ
What temperature is 100°F in Celsius?
100°F is about 37.8°C.
Is this the same formula used by weather apps?
Yes, it's the standard, universally used linear conversion — there's no alternate "more accurate" version.
What's 0°F in Celsius?
0°F is about −17.8°C.
From the blog: getting the most out of this tool
This is the direct counterpart to our Celsius-to-Fahrenheit page — we split them into two pages on purpose rather than forcing everyone through a dropdown, because search intent for each direction is genuinely different.
Both pages share one underlying formula, so a value you convert here and swap back will always return exactly where you started, down to the decimal.
📖 Want the fuller explanation?
See Metric vs Imperial Units for the reasoning behind this calculation, with worked examples.