Freezing-point reference
- Fahrenheit
- 32 °F
Result: 0 °C
- 32 → (°F − 32) × 5 ÷ 9
- = 0 °C
Subtract 32 first, so a 32°F reading becomes 0°C. Multiplying by 5/9 before applying the offset gives a different result.
Unit Converters
Fahrenheit to Celsius Converter
Convert temperatures from Fahrenheit to Celsius instantly.
Reviewed September 2, 2026Formula, example, outputs, and edge-case tests checked by CalcLogicHub.Review methodology
LOCAL CALCULATION
Enter your values
Try an example:Read the worked examples
Result
20°C
Formula
(°F − 32) × 5 ÷ 9Calculation Steps
- 68 → (°F − 32) × 5 ÷ 9
- = 20 °C
Your calculations are processed locally and are not stored.
Quick answer
For a temperature reading, subtract 32 from Fahrenheit and multiply by 5/9: °C = (°F − 32) × 5/9. A reading of 68°F equals 20°C, and 32°F equals 0°C.
Formula · Worked example · Units and assumptions · Questions and answers
How to Calculate
- Enter a temperature in Fahrenheit.
- Subtract 32, then multiply by 5/9.
- Copy the result or switch to Celsius-to-Fahrenheit.
Formula
°C = (°F − 32) × 5 ÷ 9Example
(68°F − 32) × 5 ÷ 9 = 20°C.
Units, assumptions, and limitations
- Positive, zero, and negative numeric readings are accepted.
- For a temperature difference, multiply by 5/9 without subtracting 32. The tool does not reject readings below absolute zero.
Common mistake to avoid
Applying 5/9 before subtracting 32, which changes the result.
Explanations updated . See the calculation methodology for precision and review details.
Practical examples & result interpretation
Use the matching example buttons in the calculator to load these inputs. The scenarios are illustrative, not personal advice or real customer records.
A warm-weather reading
- Fahrenheit
- 86 °F
Result: 30 °C
- 86 → (°F − 32) × 5 ÷ 9
- = 30 °C
An 86°F reading becomes 30°C. This converter changes units only; it does not determine a weather forecast or a health-safe temperature.
LEARN & APPLY
All guides →Calculation guides
Worked decisions, assumptions, and checks that put the tools in context. Guides are currently published in English.
Unit Conversion Factors, Area, Temperature & Sensible Rounding
Identify the exact unit before converting length, mass, area, temperature, or volume, and avoid common errors with squared factors, offsets, and rounding.
Read the guide →Frequently Asked Questions
What is 32°F in Celsius?
32°F equals 0°C.
How do I convert Fahrenheit to Celsius?
Subtract 32 from Fahrenheit, then multiply by 5/9.
Can the result be below zero?
Yes. Both temperature scales allow negative values.
Reference sources
Authoritative material used to check the formula, definition, or interpretation shown on this page: