What this conversion means in practice
You already have values in Fahrenheit (fahrenheit) and need Celsius (celsius) for the same material, drawing, or dataset. The factor below is the exact reciprocal of the forward direction; use it when sources quote the “other” unit first.
Temperature conversions are not ratio-only conversions. Unlike length or mass, temperature scales have different zero points and different step sizes, so most conversions require both multiplication and offset correction. That is why mistakes happen when people try to convert with one simple factor.
This page is intentionally focused on one high-intent pair. Use it when you need a clean answer fast, then use the formula and table to verify that the output is physically reasonable for your context.
Typical use cases include weather interpretation, medical thresholds, oven settings, HVAC specs, and science documentation where unit mismatches can cause expensive or unsafe mistakes.
How to convert fahrenheit to celsius
Use this relationship: °C = (°F - 32) × 5/9
Example: 25 fahrenheit converts to -3.888889 celsius.
Fahrenheit
Definition: Fahrenheit (°F) sets water freezing at 32 and boiling at 212 under standard pressure.
History and origin: Developed by Daniel Gabriel Fahrenheit with practical calibration points for precision thermometry.
Current use: Used primarily in the United States for weather, home appliances, and daily life.
Celsius
Definition: Celsius (°C) sets water freezing at 0 and boiling at 100 under standard pressure.
History and origin: Introduced in the 18th century and later standardized into modern scientific temperature practice.
Current use: Used globally for weather, healthcare, food safety, and most engineering contexts.
Fahrenheit to Celsius conversion table
| Fahrenheit (fahrenheit) | Celsius (celsius) |
|---|---|
| -40 fahrenheit | -40 celsius |
| 0 fahrenheit | -17.7778 celsius |
| 10 fahrenheit | -12.2222 celsius |
| 25 fahrenheit | -3.8889 celsius |
| 37 fahrenheit | 2.7778 celsius |
| 100 fahrenheit | 37.7778 celsius |
| 212 fahrenheit | 100 celsius |
| 273.15 fahrenheit | 133.9722 celsius |
Fahrenheit to Celsius FAQ
Quick answers for Fahrenheit-to-Celsius rounding (reverse workflow), precision, and common mistakes.
Why is temperature harder to convert than distance?
Distance units usually scale by a pure multiplier. Temperature scales often need both a multiplier and an additive offset.
Can a converted value be below absolute zero?
No. Absolute zero is 0 K, which equals -273.15 C and -459.67 F. Any value below that is physically invalid.
How much rounding should I keep?
Consumer use may need 1-2 decimals. Scientific or engineering workflows often require additional precision.