°F to °C as you type
The result updates instantly using the exact offset formula °C = (°F − 32) × 5⁄9 — no page reloads and no rounding surprises.
Fahrenheit to Celsius Converter
Convert fahrenheit to celsius instantly, in your browser.
- Input
- No upload needed — instant
- Privacy
- Nothing is uploaded
- Cost
- Free · no sign-up · no watermark
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Processed entirely on your device
Everything you type or paste is handled by JavaScript running in this tab. No request is sent, nothing is logged and nothing is stored. Close the page and it is gone.
Overview
About the Fahrenheit to Celsius Converter
Turn Fahrenheit into Celsius with an exact factor. Type a value and get °C, every other temp unit, and the working — all locally, with nothing uploaded.
Fahrenheit and Celsius describe the same quantity on two different scales, and converting between them is a single arithmetic step once you know the exact factor. This page does that step in your browser: type a value in °F and the °C result appears immediately, alongside the same figure in every other temperature unit.
The conversion
Temperature is an offset scale, so it converts with a formula rather than a multiplier:
°C = (°F − 32) × 5⁄9Because the zero points differ, applying the offset in the wrong order gives a plausible but wrong number. The engine here uses the exact relationship, and the worked example below shows it applied to a real value.
Worked example
10 °F = -12.2222 °C. Enter 10 in the box above and you will see exactly that, plus the value carried across the rest of the temp scale so you can sanity-check it against a unit you already recognise.
About these units
Temperature is the odd one out. Celsius, Fahrenheit and Kelvin are offset scales with arbitrary zero points, so they convert by an offset and a scale rather than a single multiplier — which is why −40 is the one reading that is identical on the Celsius and Fahrenheit scales.
Converting the other way
Swap the fields to reverse the formula. The page keeps your number and re-expresses it on the other scale, so you never have to rearrange the arithmetic by hand.
Step by step
How to use the Fahrenheit to Celsius Converter
Enter the value in °F (fahrenheit) that you want to convert.
Read the answer in °C, which updates the moment you type.
Scan the full temp table to see the same value in every other unit at once.
Copy the result, or press Swap to convert back the other way without re-entering anything.
Why use it
Benefits and common use cases
What this tool is good for, and what it deliberately does not try to do.
Exact, defined factors
Every temperature conversion here uses the internationally defined relationship between °F and °C, so the answer is as precise as the standard that fixes it rather than an approximation.
The whole category at once
Alongside the °C answer you get the same value expressed in every temp unit, so you can find the one you actually need without converting twice.
Private by construction
The arithmetic runs in your browser's own JavaScript. The numbers you enter are never sent to a server — close the tab and they are gone.
Questions
Frequently asked questions
Short, honest answers about quality, limits and privacy.
How do I convert °F to °C?
Temperature scales do not share a zero, so there is no single multiplier. Use °C = (°F − 32) × 5⁄9. For example, 10 °F = -12.2222 °C.
What is the formula to convert °F to °C?
°C = (°F − 32) × 5⁄9. Enter any value and this page applies it exactly, and shows the same reading in every other temp scale.
Is this temp converter accurate?
Yes. It uses the exact defined factor for °F and °C and full double-precision arithmetic. The only rounding is in how many decimals are shown, which you control with the precision menu.
Are my numbers uploaded to a server?
No. The conversion runs entirely in your browser, so nothing you type leaves your device. There is no account, no logging and no network request of any kind.