How do you convert Celsius to Fahrenheit?

Use the formula F = C × 9/5 + 32. For example, 25 °C × 9/5 + 32 = 77 °F. This tool computes it instantly as you type, so you never need to remember the formula.

What is the difference between Celsius, Fahrenheit and Kelvin?

Celsius is the standard metric scale used worldwide. Fahrenheit is used mainly in the United States. Kelvin is the scientific scale used in physics and engineering — it starts at absolute zero (-273.15 °C) and never goes negative.

At what temperature are Celsius and Fahrenheit equal?

At -40 degrees. This is the one temperature where the two scales read the same value: -40 °C = -40 °F. It happens because the scales cross at that point — a handy trivia fact and a quick sanity check.

Why do recipes and weather use different scales?

The scale depends on your region and the field. Most of the world uses Celsius for weather and oven temperatures, the US uses Fahrenheit, and science uses Kelvin. Converters like this one are essential for international recipes, travel and engineering.

Is there an easy mental shortcut for conversion?

For a rough estimate: double the Celsius and add 30 to get Fahrenheit (or subtract 30 and halve to go back). It is not exact, but close enough for weather — for precise values like this tool, use the exact formulas.

Does the tool support very low or high temperatures?

Yes. It works over the full range of each scale, including negative values and extremes like absolute zero (-273.15 °C), so it is accurate for science, engineering and everyday use alike.

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Temperature Converter — Celsius, Fahrenheit & Kelvin

Convert temperature between Celsius, Fahrenheit and Kelvin instantly as you type. Exact linear math, rounded to two decimals for readability.

Temperature

Fahrenheit (°F)

Kelvin (K)

273.15

Conversion is instant — results update as you type. Water freezes at 0°C / 32°F / 273.15K and boils at 100°C / 212°F / 373.15K.

Celsius, Fahrenheit and Kelvin

Three scales dominate the world:

Celsius (°C) — the everyday scale in most of the world; water freezes at 0° and boils at 100°.
Fahrenheit (°F) — used in the United States and a few territories; water freezes at 32° and boils at 212°.
Kelvin (K) — the absolute scientific scale, zero ("absolute zero") is −273.15°C. Used in physics, astronomy and engineering; note Kelvin has no degree symbol.

They are different rulers for the same physical temperature, and the math between them is linear — which is why conversion is always exact.

The conversion formulas

Three formulas cover every case, since all paths run through Celsius:

C → F: °F = °C × 9/5 + 32
F → C: °C = (°F − 32) × 5/9
C → K: K = °C + 273.15

Handy anchors: 0°C = 32°F = 273.15K (freezing water), 100°C = 212°F = 373.15K (boiling water), and 20°C ≈ 68°F (a comfortable room).

The conversions people search for most

The most searched temperature questions are recipe and weather based:

180°C to °F — 356°F, the standard oven temperature in most recipes.
37°C to °F — 98.6°F, average human body temperature.
100°C to °F — 212°F, boiling point.
0°C to °F — 32°F, freezing point.

Type any of these into the converter above and the other two scales update instantly.

Accuracy for cooking and science

Because the conversions are pure linear arithmetic, they are exact to every digit of precision your browser supports. We round to two decimals for readability — enough for cooking (where ovens are rarely accurate to a degree anyway) and for everyday science. Kelvin is calculated from the Celsius value, so it inherits the same precision.

Frequently Asked

Temperature Converter FAQ

Common questions about temperature conversion, answered by our science experts.

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