What temperature is the same in °F and °C?

Minus forty degrees is the only temperature where degrees Fahrenheit equals degrees Celsius.

Think of the two temperature scales like two different rulers that both measure how hot or cold something is. Degrees Celsius counts from the freezing point of water at zero and one hundred at boiling, while degrees Fahrenheit uses thirty-two for freezing and two hundred twelve for boiling. Because they start and scale differently, most temperatures have different numbers in each scale, but at one point the two rulers cross: minus forty is written the same on both scales. That happens because the conversion formula makes the numbers meet at that single value.

A common mistake is thinking there are many temperatures that match; remember only minus forty works, so check the conversion formula if you are unsure. Another mistake is misreading the negative sign; be careful to include the minus sign because positive forty is not the same. If you convert using the formula and make arithmetic errors, rework the steps slowly and double check subtraction and multiplication.

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Temperatures Equal in °F and °C at −40

1. Celsius uses zero for freezing
2. Celsius uses 100 for boiling
3. Fahrenheit uses 32 for freezing
4. Fahrenheit uses 212 for boiling
5. Only -40 matches both scales
6. Use conversion formula to check

Common Temperature Conversion Mistakes at −40

1. Thinking many temperatures match
2. Misreading the negative sign
3. Arithmetic errors during conversion

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