Fahrenheit to Celsius (°F to °C) Converter & Chart
Locked °F → °C calculator with formula, steps, and common °F table
Direction locked to °F → °C
Formula & steps
°C = (°F − 32) × 5/9
°C = (°F − 32) × 5/9 °C = (77 − 32) × 5/9 °C = 45 × 5/9 °C = 25
Common values
Engineering examples
These values are common engineering examples (datasheet corners, room temperature, and high-temperature ratings). They are not a universal operating-temperature rating for every electronic component.
Natural-language input accepted: 25C, -40 F, 300K.
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Quick Answer
°C = (°F − 32) × 5/9. 32°F = 0°C, 68°F = 20°C, 98.6°F = 37°C, 212°F = 100°C. Subtract 32 first — do not multiply the raw Fahrenheit reading by 5/9.
Fahrenheit to Celsius Converter
This page is only °F → °C. Enter Fahrenheit above; Celsius updates immediately.
Formula
°C = (°F − 32) × 5/9
Subtract 32 first so you are measuring from water’s freezing point, then scale Fahrenheit degrees down to Celsius degrees.
Worked examples
| °F | Steps | °C |
|---|---|---|
| 32 | (32 − 32) × 5/9 | 0 |
| 68 | (68 − 32) × 5/9 = 36 × 5/9 | 20 |
| 77 | (77 − 32) × 5/9 = 45 × 5/9 | 25 |
| 98.6 | (98.6 − 32) × 5/9 = 66.6 × 5/9 | 37 |
| 212 | (212 − 32) × 5/9 | 100 |
| −40 | (−40 − 32) × 5/9 = −72 × 5/9 | −40 |
Common Fahrenheit chart
| °F | °C |
|---|---|
| 0 | −17.8 |
| 32 | 0 |
| 50 | 10 |
| 68 | 20 |
| 86 | 30 |
| 104 | 40 |
| 176 | 80 |
| 212 | 100 |
A weather report of 72°F is about 22°C. An oven marked 350°F is 176.7°C — close to the 180°C setting used on many metric recipes.
Related
- Reverse: Celsius to Fahrenheit
- Equation explainer: Fahrenheit to Celsius Formula
- All three scales: Temperature Converter
- Temperature Conversion Chart
Design Notes
Electronics datasheets use Celsius exclusively. Standard operating ranges: commercial (0-70°C), industrial (-40 to 85°C), automotive (-40 to 125°C). Junction temperature is the most critical thermal parameter for IC reliability. Common corner values such as -55°C or 125°C are examples, not a universal rating for every part.
Common Mistakes
- 1
Forgetting the offset in Celsius-Fahrenheit conversion — it is NOT a simple multiplication.
- 2
Using ° symbol with Kelvin — correct notation is simply K, not °K.
- 3
Confusing temperature difference with absolute temperature — a 10°C rise = 18°F rise, but 10°C = 50°F.
Engineering Handbox
°C = (°F − 32) × 5/9 °C = (77 − 32) × 5/9 °C = 45 × 5/9 = 25
Knowledge Base
How do I convert Fahrenheit to Celsius?
Subtract 32, then multiply by 5/9. Example: 50°F → 18 × 5/9 = 10°C.
What is 72°F in Celsius?
72°F = 22.2°C. (72 − 32) × 5/9 = 40 × 5/9 = 22.222…°C.
How do I convert the other way?
°F = (°C × 9/5) + 32, or use the Celsius to Fahrenheit converter.