How do I convert Fahrenheit to Celsius?

Formula: °C = (°F − 32) × 5/9. Examples: 98.6°F (body temp) = (98.6−32)×5/9 = 66.6×0.556 = 37°C. 32°F (freezing) = 0°C. 212°F (boiling) = 100°C. 72°F (room temp) ≈ 22.2°C. Quick estimate: subtract 30 and halve → 72°F: (72−30)÷2 = 21°C (exact is 22.2, but close enough for everyday use).

What is 100 degrees Fahrenheit in Celsius?

(100 − 32) × 5/9 = 68 × 0.5556 = 37.8°C. 100°F is approximately body temperature for a person with a mild fever (normal body temp is 98.6°F = 37.0°C).

At what temperature are Fahrenheit and Celsius equal?

°F and °C are equal at −40°. Both scales converge at −40°, because −40°C = (−40 × 9/5) + 32 = −72 + 32 = −40°F.

Why does the US use Fahrenheit while most countries use Celsius?

The Fahrenheit scale was proposed by Daniel Fahrenheit in 1724 and was widely adopted in English-speaking countries. Most of the world switched to Celsius (proposed by Anders Celsius in 1742) as part of metric system adoption in the 19th–20th centuries. The US, Myanmar, and the Cayman Islands are the only countries that still use Fahrenheit as the primary temperature scale in everyday life.

Fahrenheit to Celsius (°F to °C) Converter

Also try: °C to °F | °C to K

Fahrenheit to Celsius — Formula & Reference

The Fahrenheit scale (°F) is primarily used in the United States for everyday temperature measurement. The Celsius scale (°C) is the international standard for scientific and most everyday usage.

Formula

              °C = (°F − 32) × 5/9
            

Key Reference Temperatures

Fahrenheit (°F)	Celsius (°C)	Reference
32 °F	0 °C	Freezing point of water
68 °F	20 °C	Room temperature
98.6 °F	37 °C	Normal body temperature
212 °F	100 °C	Boiling point of water

Related Converters

°C → °F °C → K K → °C KG → LBS KPH → MPH L → gal

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Fahrenheit to Celsius (°F to °C) Converter

Fahrenheit to Celsius — Formula & Reference

Formula

Key Reference Temperatures

Related Converters

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