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Convert Celsius to Fahrenheit and Fahrenheit to Celsius, as well as Kelvin and Rankine: Type in either field and the other updates instantly, complete with the calculation. For example, 25 °C is 77 °F. Free, no sign-up required, and the conversion runs in your browser.
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Result
77 °F
25 °C is 77 °F.
Calculation steps
Example result
This is what the results look like. Enter your own values above to see the result instantly.
Celsius to Fahrenheit
77 °F
25 °C is 77 °F.
Oven: Fahrenheit to Celsius
176.667 °C
350 °F is 176.667 °C.
Body temperature in Fahrenheit
98.6 °F
37 °C is 98.6 °F.
Kelvin to Celsius
26.85 °C
300 K is 26.85 °C.
Why use this temperature converter?
How this converter differs from a single input field
Two linked fields
Type in the Celsius or Fahrenheit field: the other field updates instantly, without a button or switching direction. Negative values work too.
Four temperature scales
Celsius, Fahrenheit, Kelvin and Rankine: Convert one temperature to all scales at once and swap units with one click.
Oven and recipes
US recipes give oven temperatures in Fahrenheit. The oven table and calculator show you the Celsius equivalent, for example, 350 °F as 176.67 °C.
Absolute zero
There is no temperature below absolute zero. Instead of showing a meaningless number, the calculator reports this and knows the limit for every scale.
Exact instead of rounded
The calculator uses the exact definitions (0 °C is 273.15 K; 9/5 and 5/9) rather than rounded approximations and avoids floating-point calculation errors.
Calculation steps and link
For each result, the calculator shows the formula with your numbers. Copy the result as a sentence or share a link with your values.
How it works
Three steps from temperature to result.
Step 1
Choose above whether to compare two scales or see one temperature on all four scales (Celsius, Fahrenheit, Kelvin, Rankine) at once.
Step 2
Enter the temperature in either field, including negative values. Both commas and periods work, and the other field updates instantly. Use the selectors below to change scales.
Step 3
View the result and calculation, choose 0 to 4 decimal places or Auto, and copy the result or a link with your values.
Tables
The most common values at a glance: Celsius, Fahrenheit, oven settings from US recipes, and Kelvin.
| °C | °F | K |
|---|---|---|
| -40 | -40 | 233.15 |
| -20 | -4 | 253.15 |
| -10 | 14 | 263.15 |
| 0 | 32 | 273.15 |
| 5 | 41 | 278.15 |
| 10 | 50 | 283.15 |
| 15 | 59 | 288.15 |
| 20 | 68 | 293.15 |
| 25 | 77 | 298.15 |
| 30 | 86 | 303.15 |
| 35 | 95 | 308.15 |
| 37 | 98.6 | 310.15 |
| 40 | 104 | 313.15 |
| 50 | 122 | 323.15 |
| 100 | 212 | 373.15 |
| °F | °C |
|---|---|
| 0 | -17.78 |
| 10 | -12.22 |
| 20 | -6.67 |
| 32 | 0 |
| 40 | 4.44 |
| 50 | 10 |
| 60 | 15.56 |
| 70 | 21.11 |
| 72 | 22.22 |
| 80 | 26.67 |
| 90 | 32.22 |
| 98.6 | 37 |
| 100 | 37.78 |
| 212 | 100 |
| °F | °C |
|---|---|
| 250 | 121.11 |
| 275 | 135 |
| 300 | 148.89 |
| 325 | 162.78 |
| 350 | 176.67 |
| 375 | 190.56 |
| 400 | 204.44 |
| 425 | 218.33 |
| 450 | 232.22 |
| 475 | 246.11 |
| K | °C | °F |
|---|---|---|
| 0 | -273.15 | -459.67 |
| 100 | -173.15 | -279.67 |
| 200 | -73.15 | -99.67 |
| 273.15 | 0 | 32 |
| 293.15 | 20 | 68 |
| 300 | 26.85 | 80.33 |
| 373.15 | 100 | 212 |
Conversion
The two scales differ in their zero points and the size of a degree. That’s why conversion in either direction requires multiplication and addition.
Celsius to Fahrenheit
°F = °C × 9/5 + 32
Example: 25 °C × 9/5 + 32 = 77 °F
Fahrenheit to Celsius
°C = (°F − 32) × 5/9
Example: (100 °F − 32) × 5/9 = 37.778 °C
Yes, for a rough estimate. For 25 °C, doubling and adding 30 gives 80 °F; the exact calculation gives 77 °F. The error increases the farther you get from 10 °C, so the rule of thumb is too imprecise for oven temperatures.
You cannot go below 0 K: that is -273.15 °C and -459.67 °F. The Kelvin scale starts there and uses the same degree size as Celsius, so K = °C + 273.15.
| Reference point | °C | °F | K |
|---|---|---|---|
| Absolute zero | -273.15 | -459.67 | 0 |
| Both scales equal | -40 | -40 | 233.15 |
| Water freezes | 0 | 32 | 273.15 |
| Typical body temperature | 37 | 98.6 | 310.15 |
| Water boils (at sea level) | 100 | 212 | 373.15 |
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FAQ
Quick answers about converting Celsius, Fahrenheit and Kelvin.
Multiply the Celsius value by 9/5 (that is, 1.8) and add 32. So 25 °C is 25 × 1.8 + 32 = 77 °F. In the calculator, enter the number in the Celsius field; the Fahrenheit field fills in immediately, with the calculation shown below.
Subtract 32 and multiply by 5/9. So 100 °F is (100 − 32) × 5/9 = 37.78 °C. Enter the number in the Fahrenheit field, and the Celsius field fills in immediately.
350 °F is 176.67 °C. Recipes using Celsius usually round this to 175 or 180 °C. 375 °F is 190.56 °C, and 400 °F is 204.44 °C. The oven temperature chart shows common Fahrenheit values from 250 to 475 °F in Celsius. Conversely, 180 °C is exactly 356 °F, and 200 °C is exactly 392 °F.
30 °C is 86 °F, 40 °C is 104 °F, and 20 °C is 68 °F. Conversely, 70 °F rounds to 21.11 °C, and 100 °F is 37.78 °C, not 40 °C. You'll find these and other values in the Celsius and Fahrenheit charts.
37 °C is 98.6 °F. This is often cited as a typical body temperature. 36.6 °C is 97.88 °F, and 38 °C is 100.4 °F. In the All Temperatures tab, you can also see a value in Kelvin and Rankine.
At minus 40, −40 °C is exactly −40 °F. This is the only point where both scales show the same number. For comparison, water freezes at 0 °C, or 32 °F, and boils at sea level at 100 °C, or 212 °F.
Subtract 273.15. So 300 K is 26.85 °C. To convert the other way, add 273.15: 20 °C is 293.15 K. No temperature can fall below 0 K, absolute zero at −273.15 °C and −459.67 °F; the calculator will flag it. It also converts Rankine alongside Celsius, Fahrenheit, and Kelvin.
No. Conversion takes place entirely in your browser; no values are sent to a server. Your values appear only in your browser's address bar (and therefore its history), so you can copy the link or share it using “Share link.”
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