Fahrenheit to Celsius Converter (°F → °C)
Converting Fahrenheit to Celsius is essential when traveling to countries using the metric system, following international recipes, studying science, or checking weather forecasts from Europe and Asia. The formula subtracts 32 from Fahrenheit, then multiplies by 5/9.
Conversion Formula & Step-by-Step Method
°C = (°F − 32) × 5/9
- Take the temperature in Fahrenheit (°F)
- Subtract 32
- Multiply by 5
- Divide by 9
- Add the "°C" unit label
Quick Conversion Table
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Frequently Asked Questions
What is the easiest way to convert Fahrenheit to Celsius?
Subtract 30 from Fahrenheit then divide by 2 for a quick estimate. For example, 70°F − 30 = 40, ÷ 2 = 20°C (real answer: 21.1°C).
What is 0°F in Celsius?
0°F equals approximately -17.78°C.
What is 100°F in Celsius?
100°F equals approximately 37.78°C, which is near human body temperature.
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Standards Reference & Metrological Grounding
Calculations and conversion factors in this guide adhere to NIST Special Publication 811 and BIPM SI brochure definitions. Review our complete institutional standards and sources directory.