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Celsius to Fahrenheit Calculator

Convert Celsius to Fahrenheit instantly.

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Enter your values and click Calculate

How It Works

The conversion formula is: °F = (°C × 9/5) + 32, which can also be written as °F = (°C × 1.8) + 32. The formula has two components. The multiplication by 9/5 accounts for the different scale intervals between the two systems — one Celsius degree spans 9/5 (1.8) Fahrenheit degrees, meaning the Fahrenheit scale has smaller intervals. The addition of 32 accounts for the different zero points: Celsius sets 0° at the freezing point of water, while Fahrenheit sets 0° at a historical brine mixture freezing point, placing the water freezing point at 32°F. Both operations together convert any Celsius value to its precise Fahrenheit equivalent. The two scales intersect at exactly −40°, the only temperature where both scales read the same value — which can be derived algebraically by setting °F = °C in the formula and solving.

Examples

Boiling Point of Water
100°C is the boiling point of water at sea level.
Result: 100°C equals 212°F.
Body Temperature
Normal human body temperature is 37°C.
Result: 37°C equals 98.6°F.
Freezing Point
Water freezes at 0°C.
Result: 0°C equals 32°F.

Frequently Asked Questions

What is the formula for Celsius to Fahrenheit?
The formula is °F = (°C × 9/5) + 32, sometimes written as °F = (°C × 1.8) + 32. The multiplication by 9/5 scales the degree size — one Celsius degree equals 1.8 Fahrenheit degrees — and the +32 offset accounts for the different zero points of the two scales.
At what temperature are Celsius and Fahrenheit equal?
Celsius and Fahrenheit are equal at exactly −40°. You can verify this algebraically: set °C = °F in the formula and solve to get C = C × 1.8 + 32, which simplifies to −0.8C = 32, giving C = −40. This is the only temperature where both scales read the same value.
Why does the US use Fahrenheit?
The US adopted Fahrenheit in the colonial era, long before the metric system was established, and never mandated a switch to Celsius the way most other countries did in the 20th century. Fahrenheit was historically defined using human body temperature and a brine freezing point as reference points, making it intuitive for everyday weather in a human-centric range of roughly 0°F (very cold) to 100°F (very hot).

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