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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. Temperature conversions happen entirely in your browser — the values you enter are never transmitted or stored anywhere.