What is the formula to convert Celsius to Fahrenheit?

What is the formula to convert Celsius to Fahrenheit?

• A. [°F] = (1.8 × [°C]) + 32
• B. [°F] = [°C] + 273
• C. [°F] = [°C] × 0.5 + 32
• D. [°F] = 2 × [°C] + 32

Answer: (A)

Converting Celsius to Fahrenheit relies on a linear relationship between the two scales: you multiply by 9/5 (1.8) to adjust the size of a degree, then add 32 to account for the difference in zero points. This means F = (9/5) × C + 32, which is the exact form shown as 1.8 × [°C] + 32. The fixed points of water help illustrate why: 0 °C corresponds to 32 °F, and 100 °C corresponds to 212 °F, so the conversion must scale by 1.8 and shift up by 32. The given formula matches this relationship precisely, so it’s the correct one. Other forms would mishandle either the degree size or the zero-point offset—adding 273 relates to converting to Kelvin, and multipliers like 0.5 or 2 distort the slope, giving incorrect Fahrenheit values (for example, at 100 °C you’d get 82 °F or 232 °F, not 212 °F).

Converting Celsius to Fahrenheit relies on a linear relationship between the two scales: you multiply by 9/5 (1.8) to adjust the size of a degree, then add 32 to account for the difference in zero points. This means F = (9/5) × C + 32, which is the exact form shown as 1.8 × [°C] + 32. The fixed points of water help illustrate why: 0 °C corresponds to 32 °F, and 100 °C corresponds to 212 °F, so the conversion must scale by 1.8 and shift up by 32. The given formula matches this relationship precisely, so it’s the correct one. Other forms would mishandle either the degree size or the zero-point offset—adding 273 relates to converting to Kelvin, and multipliers like 0.5 or 2 distort the slope, giving incorrect Fahrenheit values (for example, at 100 °C you’d get 82 °F or 232 °F, not 212 °F).