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Fahrenheit to Celsius for weather forecasts, oven settings, fevers and spec sheets — computed exactly as °C = (°F − 32) × 5/9. The swap button reverses to Celsius → Fahrenheit, and Kelvin is available for the scientific cases. Reference points that anchor intuition: 32 °F = 0 °C (freezing), 98.6 °F = 37 °C (body temperature), 212 °F = 100 °C (boiling).
Frequently asked questions
What's a quick mental F to C conversion?
Subtract 30 and halve: 70 °F → (70−30)/2 = 20 °C (exact: 21.1). It's within a degree or two across the weather range — fine for deciding on a jacket.
Why do the scales cross at −40°?
−40 °F equals exactly −40 °C — the one point where the two scales agree, falling out of the formula when you solve F = C.