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ToolWrenConvert temperatures between Celsius, Fahrenheit and Kelvin — for cooking, science, weather and travel.
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Temperature is a free, private online tool that lets you convert temperature between Celsius, Fahrenheit and Kelvin instantly. It runs entirely in your browser, so nothing you enter is uploaded to a server.
Privacy: this tool runs entirely in your browser. Your input is never sent to, received by, or stored on any server — there are no uploads and no tracking of what you enter.
Celsius is used by most of the world, Fahrenheit mainly in the US, and Kelvin in science (it starts at absolute zero). Water freezes at 0C / 32F / 273.15 K.
F = C x 9/5 + 32. C = (F - 32) x 5/9. K = C + 273.15. The scales have different zero points, so it is not a simple multiply.
20C = 68F (room), 37C = 98.6F (body), 100C = 212F (boiling).
Three scales dominate. Celsius (°C) is used by most of the world, with water freezing at 0° and boiling at 100°. Fahrenheit (°F) is used mainly in the United States, with water freezing at 32° and boiling at 212°. Kelvin (K) is the scientific scale; it starts at absolute zero — the coldest possible temperature — and shares Celsius's degree size.
Unlike length or weight, you cannot convert temperature by multiplying by a single factor, because the scales have different zero points as well as different degree sizes. Converting needs an offset too. That is why the formulas involve both a multiply and an add — and why a dedicated converter avoids easy arithmetic slips.
The core formulas are: °F = °C × 9/5 + 32; °C = (°F − 32) × 5/9; and K = °C + 273.15. So 25°C is 77°F, and 98.6°F (body temperature) is 37°C. Kelvin is just Celsius shifted by 273.15, so 0°C equals 273.15 K and absolute zero (0 K) is −273.15°C.
A few anchors make estimates easy: 0°C/32°F (water freezes), 20°C/68°F (comfortable room temperature), 37°C/98.6°F (human body), 100°C/212°F (water boils), and −40° is the one temperature where Celsius and Fahrenheit read the same. This tool shows all three scales at once so you can sanity-check any value.
Temperature conversion comes up in cooking with foreign recipes, checking the weather while travelling, science and chemistry homework, and setting ovens, fridges or thermostats sold in another country's units. Everything is calculated instantly in your browser.