Fahrenheit to Celsius Converter
1 Fahrenheit is equal to 0.555556Celsiuss (°C). To convert fahrenheits to celsiuss, multiply the value by 0.555556 or use the interactive formula breakdown and reference tables below.
Temperature Converter
-- ⚡ All Temperature Scales
Real-time simultaneous conversions across standard thermodynamic and regional scales.
Metric standard (Water freezes at 0°, boils at 100°)
US customary scale (Water freezes at 32°, boils at 212°)
SI thermodynamic absolute zero reference
Absolute thermodynamic scale using Fahrenheit increments
Historical scale (Water freezes at 0°, boils at 80°)
Step-by-Step Mathematical Derivation
To convert any quantity from Fahrenheit to Celsius, multiply the quantity by the constant conversion factor 0.5555556.
To reverse the operation, multiply your Celsius figure by 1.8 (or divide by 0.5555556).
- Identify the starting value in Fahrenheit (°F).
- Apply the exact linear conversion factor:
1 °F = 0.5555556 °C. - Multiply the input value by 0.5555556 to obtain the exact measurement in Celsius (°C).
- Verify precision against standard BIPM / NIST SP 811 statutory guidelines.
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Printable Reference Cheat Sheet
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Academic & Research Citation Exporter
Cite this mathematical formula and conversion factor in research papers and wikis
@misc{ai_unit_converter_fahrenheit_to_celsius,
author = {AI Unit Converters Standards Board},
title = {Exact Fahrenheit to Celsius Conversion Factor and Mathematical Derivation},
year = {2026},
howpublished = {\url{https://aiunitconverters.com/temperature/f-to-c}},
note = {Derived from NIST Special Publication 811 and BIPM SI Brochure}
}📊Fahrenheit to Celsius Conversion Tables
| -40°F | -40°C |
| -20°F | -28.8889°C |
| 0°F | -17.7778°C |
| 10°F | -12.2222°C |
| 20°F | -6.6667°C |
| 25°F | -3.8889°C |
| 30°F | -1.1111°C |
| 37°F | 2.7778°C |
| 50°F | 10°C |
| 75°F | 23.8889°C |
| 100°F | 37.7778°C |
| 150°F | 65.5556°C |
| 200°F | 93.3333°C |
| 250°F | 121.1111°C |
| 300°F | 148.8889°C |
| 500°F | 260°C |
| -40°C | -40°F |
| -20°C | -4°F |
| 0°C | 32°F |
| 10°C | 50°F |
| 20°C | 68°F |
| 25°C | 77°F |
| 30°C | 86°F |
| 37°C | 98.6°F |
| 50°C | 122°F |
| 75°C | 167°F |
| 100°C | 212°F |
| 150°C | 302°F |
| 200°C | 392°F |
| 250°C | 482°F |
| 300°C | 572°F |
| 500°C | 932°F |
❓ Frequently Asked Questions: Fahrenheit to Celsius
How do you convert Fahrenheits to Celsiuss?▼
To convert from Fahrenheit to Celsius, apply the standard thermodynamic conversion formula shown in the derivation card above.
How many Celsiuss are in 1 Fahrenheit?▼
There are exactly -17.222222Celsiuss (°C) in 1 Fahrenheit (°F).
Are these calculations calibrated against official measurement standards?▼
Yes. All conversion factors on AI Unit Converters are calibrated and cross-verified against official BIPM SI Brochure (9th Edition), NIST SP 811, and ISO 80000 measurement metrology standards.