Celsius to Fahrenheit Converter

Celsius is the temperature scale used in UK weather forecasts, oven dials, fridge thermostats and almost every country except the United States. Fahrenheit is the scale Americans grew up with, and it still appears on imported recipes, US weather apps and many older British cookbooks.

The formula in plain English: multiply the Celsius temperature by 1.8 (the same as 9 ÷ 5), then add 32. So °F = °C × 1.8 + 32. The scales are offset because they pick different reference points — Celsius uses 0 for the freezing point of water and 100 for boiling; Fahrenheit puts freezing at 32 and boiling at 212.

Worked example. A UK summer's day at 25 °C: 25 × 1.8 = 45, plus 32 = 77 °F. A cool British morning at 10 °C is 10 × 1.8 + 32 = 50 °F. A heatwave at 32 °C is 32 × 1.8 + 32 ≈ 90 °F — the US informal threshold for a "hot" day. Body temperature of 37 °C is 37 × 1.8 + 32 = 98.6 °F, the famous American "normal".

Why this matters. The difference between 350 °F and 350 °C is the difference between a cake and a fire. American recipes routinely give oven temperatures in Fahrenheit, and treating those numbers as Celsius will incinerate the food and risk damaging your oven. The same applies to fridge and freezer temperatures, weather forecasts when travelling, and medical thermometers brought back from the US.

When to use it. Following US recipes, reading American weather forecasts, comparing fridge or freezer settings against imported guidance, and decoding oven manuals shipped with US appliances.

When not to rely on memory alone. The two scales aren't linear multiples of each other — there's an offset of 32 — so any "just double it" shortcut breaks at low temperatures. Use the proper formula or this converter for anything you're cooking, refrigerating or dosing.

Common mistakes. Forgetting to add 32 after multiplying. Using °C numbers on a Fahrenheit oven (200 °C in a Fahrenheit oven is barely warm). Reading "fan oven" vs "conventional oven" recipes interchangeably — fan ovens run about 20 °C / 36 °F hotter at the same dial setting, so you need to drop the temperature when converting.