Fahrenheit to Celsius Converter

Frequently Asked Questions

How do I convert Fahrenheit to Celsius?

To convert Fahrenheit to Celsius, subtract 32 and multiply by 5/9. Formula: °C = (°F - 32) × 5/9. For example, 98.6°F (body temperature): (98.6 - 32) × 5/9 = 66.6 × 0.556 = 37°C. For quick estimates, subtract 30 and divide by 2.

How do I convert Celsius to Fahrenheit?

To convert Celsius to Fahrenheit, multiply by 9/5 and add 32. Formula: °F = (°C × 9/5) + 32. For example, 25°C: (25 × 1.8) + 32 = 45 + 32 = 77°F. For quick estimates, double the Celsius and add 30.

What temperature is the same in Celsius and Fahrenheit?

-40 degrees is the same in both Celsius and Fahrenheit. This is the only point where the two scales intersect. You can verify: (-40 × 9/5) + 32 = -72 + 32 = -40. This occurs because of the different zero points and scale intervals of the two systems.

What is normal body temperature in Celsius and Fahrenheit?

Normal body temperature is approximately 37°C or 98.6°F. However, normal ranges from 36.1-37.2°C (97-99°F). Temperature varies by time of day, activity level, and measurement location. A fever is generally considered 38°C (100.4°F) or higher.

Why does the US use Fahrenheit?

The US adopted Fahrenheit (invented by Daniel Fahrenheit in 1724) before Celsius became the global standard. While most countries switched to Celsius with metric adoption, the US retained Fahrenheit due to the cost of changing weather systems, thermostats, and public familiarity. It remains the everyday scale for weather and cooking in the US.

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