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Temperature converter

Convert temperatures between Celsius, Fahrenheit and Kelvin, one value per line.

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Temperature converter
Type a temperature — or paste a whole list, one value per line — and this tool converts it instantly between Celsius, Fahrenheit and Kelvin. A line can carry its own unit, like 100 °C, 212F or 373.15 K, and is converted from that unit; a bare number uses the From select. Decimals work with a period or a comma, so 36.6 and 36,6 read as the same value. Keep the target on a single unit for one clean value per line, or switch to All units to see the full chain: 100 °C = 212 °F = 373.15 K. The Decimals option controls how precisely results are rounded, and trailing zeros are trimmed.
The everyday reason is the Atlantic divide: Europe and most of the world measure in Celsius, while the United States sticks with Fahrenheit. An American recipe that says bake at 350 °F means a 177 °C oven; a forecast of 95 °F on a US trip is a 35 °C day. Kelvin covers the scientific side — lab protocols, physics homework and component datasheets state temperatures in kelvins, and a 25 °C room is 298.15 K.
Values below absolute zero (0 K, that is −273.15 °C or −459.67 °F) are physically impossible, so the tool flags them with the line number instead of returning nonsense — usually the sign of a wrong From unit. Lines that are not temperatures pass through unchanged, so a rough list of notes converts fine.
Everything runs locally in your browser — nothing is uploaded and nothing is looked up. Copy the result or download it as a .txt file when you are done.
FAQ
What are the exact conversion formulas?
°F = °C × 9/5 + 32, °C = (°F − 32) × 5/9, and K = °C + 273.15. Fahrenheit to Kelvin goes through Celsius: K = (°F − 32) × 5/9 + 273.15. The tool applies these exactly and rounds only for display, to the number of decimals you choose.
How do I convert an American oven temperature?
Set From to Fahrenheit — or type the unit on the line, like 350F — and To to Celsius. 350 °F is 176.67 °C, so a European oven at 175–180 °C matches. Handy anchors: 325 °F ≈ 163 °C, 400 °F ≈ 204 °C, 450 °F ≈ 232 °C.
Can I convert many temperatures at once?
Yes. Paste any number of lines, even with mixed units — each line with its own unit converts from that unit, bare numbers use the From select, and anything that is not a temperature passes through unchanged.
Why does the tool reject some negative values?
Nothing can be colder than absolute zero: 0 K, −273.15 °C or −459.67 °F. A value below it is physically impossible — usually a typo or a wrong From unit — so the tool names the offending line instead of printing an impossible result.
Is my text uploaded anywhere?
No. The tool runs entirely in your browser and your input never leaves your device.