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Celsius to Fahrenheit for US weather forecasts, oven settings in American recipes, and spec sheets that assume Fahrenheit. Computed exactly as °F = (°C × 9/5) + 32 — the multiplication before the addition, which is the step people drop when doing it in their heads.
Frequently asked questions
What's a quick mental C to F conversion?
Double it and add 30: 20 °C → 40 + 30 = 70 °F (exact: 68). It runs a couple of degrees high at the warm end but is fine for deciding what to wear.
What are the common oven temperatures in Fahrenheit?
160 °C = 320 °F, 180 °C = 356 °F (usually written as 350 °F), 200 °C = 392 °F (written 400 °F), 220 °C = 428 °F (written 425 °F). US recipes round to the nearest 25, so match the nearest marked setting rather than chasing the exact figure.