Celsius to Fahrenheit Chart
Every degree from -10 to 40 Celsius, in Fahrenheit.
Runs entirely in your browser
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Conversion table
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Every degree from minus ten to forty Celsius, in Fahrenheit. That range is chosen to cover weather rather than cooking: it runs from a hard frost to the hottest day most places see, which is what the conversion is usually wanted for.
Temperature is the one conversion on this site that is not a multiplication. Every other pair of units shares a zero, so converting is scaling; Celsius and Fahrenheit do not, and their scales cross at minus forty. That is why the formula carries an offset, F = C x 9/5 + 32, and why doubling a Celsius figure is a bad habit that is only close by luck near twenty degrees.
For an oven rather than a forecast, the oven temperature chart covers the range that matters there in the steps a dial is actually marked in.
How to use it
- Read the table, which is built for this pair of units when the page opens.
- Change Start, Step or Rows to cover a different range.
- Press Print for the table on its own, without the rest of the page.
Questions
What is the formula for Celsius to Fahrenheit?
Multiply by nine fifths and add thirty-two: F = C x 9/5 + 32. The addition is the part people drop. It is there because the two scales do not share a zero, unlike almost every other pair of units, where converting is a single multiplication.
At what temperature are Celsius and Fahrenheit the same?
At minus forty. The scales run at different rates and cross exactly once, which is why minus forty degrees needs no unit after it. Extend the chart down that far by setting Start to -40 and it is the one row where both columns match.
Why does the chart start at -10?
Because it is built for weather, and minus ten is a hard frost almost anywhere. Start and Rows both take any value, so for a freezer set Start to -25, and for body temperature set it to 35 with a step of 0.1.
Can I change the range of the chart?
Yes. Start is the first value in the left column, Step is the gap between rows, and Rows is how many there are, up to two hundred. All three update the table as you type, and the unit menus above them will convert any other pair in the same category.
Is the table built on my device?
Yes, by WebAssembly compiled from Rust, using conversion factors that are compiled in rather than fetched. Nothing is uploaded, nothing is stored, and the page prints the same table with the network off.
Other charts
The same table for a different pair of units. The range on any of them is yours to change.
- Inches to Centimetres Chart
- Centimetres to Inches Chart
- Kilograms to Pounds Chart
- Oven Temperature Conversion Chart
Your data stays on your device
Everything above runs inside your browser as WebAssembly compiled from Rust. Nothing you type is uploaded, logged or stored on a server. You can load this page once, go offline, and it still works.
This page makes no requests at all, to anywhere. That is not a promise in the copy: it is a Content-Security-Policy header your browser enforces, and connect-src on it is none. Open the network tab and watch nothing happen.