Fahrenheit to Celsius

Fahrenheit to Celsius

The Fahrenheit-to-Celsius converter changes temperatures from the Fahrenheit scale to the Celsius scale. This is practical when adapting American baking recipes or understanding temperatures from abroad in your familiar metric scale. The conversion follows a simple formula and happens directly in your browser.

How it works

The formula for converting Fahrenheit to Celsius is: C = (F - 32) × 5/9. This means you first subtract 32 from the Fahrenheit value, multiply the result by 5, and then divide by 9. As a concrete example, 77 degrees Fahrenheit is converted to Celsius by calculating 77 - 32 = 45, then 45 × 5/9 = 25, yielding 25 degrees Celsius. Another example: 32 degrees Fahrenheit, the freezing point of water, yields (32 - 32) × 5/9 = 0 degrees Celsius. The boiling point of water is 212 degrees Fahrenheit, which corresponds to (212 - 32) × 5/9 = 100 degrees Celsius.

What the tool can and cannot do

This tool performs a simple conversion from Fahrenheit to Celsius. It cannot calculate temperature differences, model temperature changes, or run thermal computations. It converts only individual values in one direction and the reverse. For Celsius-to-Fahrenheit, the inverse applies: F = °C × 9/5 + 32. The calculator does not accept non-numeric inputs and does not run complex physical simulations.

Why local processing in the browser

All calculations happen locally in your browser. Your inputs are never sent to a server, there is no upload and no server log files storing your data. You need no account and do not need to register. After the page loads, the calculator works offline too, because the assets are cached in the browser. There is no attackable server and nothing is transmitted over the network. You can freely calculate, discard results, and re-enter values as often as you like, because nothing is stored or tracked.

Frequently asked questions