Temperature Converter
Convert between Celsius, Fahrenheit and Kelvin with the formulas shown.
Processing: This tool runs entirely in your browser. Your input and any file you open stay on your device — nothing is uploaded to a server.
How to use the temperature converter
- Type a value into any of the three fields.
- The other two update as you type.
- Use the reference points below to sanity-check the result.
About this tool
Celsius and Fahrenheit disagree on both the size of a degree and where zero sits, which is why converting needs a multiplication and an addition rather than just a factor: °F = °C × 9/5 + 32. Kelvin uses the Celsius degree but starts at absolute zero, so it is simply K = °C + 273.15.
The scales cross at −40, where both read the same number — a useful sanity check if a conversion ever looks wrong.
Common uses
- Following a recipe written for the other scale.
- Converting an oven temperature.
- Reading a scientific figure given in Kelvin.
Frequently asked questions
- What is normal body temperature in each scale?
- About 37°C, 98.6°F or 310.15K — though normal varies by roughly half a degree between people and across the day.
- Can temperature go below absolute zero?
- No. 0K, which is −273.15°C, is the lower bound. Values below it are rejected here.
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