Fahrenheit to Celsius Converter

C = (F - 32) x 5 / 9. The 32 shifts the freezing point, because water freezes at 32 F and 0 C. The 5/9 changes the step size, because there are 180 Fahrenheit degrees between freezing and boiling where there are 100 Celsius degrees.

What is 72 F in Celsius?

22.2 C. That is 72 minus 32, which is 40, times 5/9. It is the temperature most American thermostats sit at, and 22 is where most European ones sit, so the two habits agree more than they look like they do.

How do I convert Fahrenheit to Celsius in my head?

Subtract 30 and halve it. For 72 F that gives 21 against a true 22.2. The shortcut drifts at the extremes but holds within a couple of degrees across normal weather, which is all a forecast needs.

What are the common oven temperatures in Celsius?

325 F is 163 C, 350 F is 177 C, 375 F is 191 C and 400 F is 204 C. Recipes usually round these to 160, 180, 190 and 200, because oven dials are not precise enough for the difference to exist.

Why does the formula have a 32 in it?

Because the two scales do not start in the same place. Fahrenheit put zero at the coldest temperature he could reliably reproduce with a salt and ice mixture; Celsius put zero at the freezing point of water. The 32 is the gap between those two decisions.