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Type in the Celsius or the Fahrenheit box. The other side updates as you type, with no button to press.
Free temperature tool · Works both ways
Celsius to Fahrenheit Converter
Convert Celsius to Fahrenheit instantly, or type in the Fahrenheit box to go the other way. You also get Kelvin, the formula worked out with your numbers, a live thermometer, and printable charts for weather, body and oven temperatures.
- °C ⇄ °F live
- Step-by-step formula
- Printable charts
- Kelvin & Rankine
Celsius to Fahrenheit converter
Type in either box and the other one updates instantly.
Popular:
25 °C = 77 °F
Kelvin298.15 K
Rankine536.67 °R
Quick estimate≈ 80 °FDouble it, add 30. Off by 3 °F
Feels likeComfortable
How it was worked out
- Multiply by 9/5 (1.8)25 × 1.8 = 45
- Add 3245 + 32 = 77 °F
77 °F
25 °C
Comfortable
Typical room temperature for homes and offices.
Key temperatures
Printable reference
Celsius to Fahrenheit Chart
Pick a chart. The row closest to your current temperature is highlighted.
| °C | °F |
|---|---|
| −40 | −40 |
| −35 | −31 |
| −30 | −22 |
| −25 | −13 |
| −20 | −4 |
| −15 | 5 |
| −10 | 14 |
| −5 | 23 |
| 0 | 32 |
| 5 | 41 |
| 10 | 50 |
| 15 | 59 |
| °C | °F |
|---|---|
| 20 | 68 |
| 25 | 77 |
| 30 | 86 |
| 35 | 95 |
| 40 | 104 |
| 45 | 113 |
| 50 | 122 |
| 55 | 131 |
| 60 | 140 |
| 65 | 149 |
| 70 | 158 |
| 75 | 167 |
| °C | °F |
|---|---|
| 80 | 176 |
| 85 | 185 |
| 90 | 194 |
| 95 | 203 |
| 100 | 212 |
| 120 | 248 |
| 150 | 302 |
| 180 | 356 |
| 200 | 392 |
| 250 | 482 |
| 300 | 572 |
Body temperature labels are a general guide only. Normal ranges vary by person and by where the temperature is taken, so ask a doctor about any fever concerns. Oven figures are rounded the way recipes print them; fan ovens run about 20 °C hotter.
Batch tool
Convert a List of Temperatures
Paste one temperature per line, for example from a recipe or a weather table. Add C or F after a number to mix both scales in one list.
Results
Why use this one
A Better Celsius to Fahrenheit Converter
Most converters give you one number and nothing else. This tool shows the answer, explains it, and puts it in context so the number actually means something.
Live thermometer
A color-changing thermometer and a plain-English label tell you how hot or cold the temperature really feels.
Formula worked out
See each step of the calculation with your own numbers, plus a quick mental estimate and how close it gets.
Four printable charts
Switch between °C to °F, °F to °C, body temperature and oven gas mark charts, then copy them as CSV.
Bulk conversion
Paste a whole list of temperatures from a recipe or report and convert every line at once.
Private and lightweight
Everything runs in your browser, loads fast on phones and never asks you to sign up.
Quick start
How to Use This Temperature Converter
Enter a temperature
Type a Celsius value on the left, or a Fahrenheit value on the right. Negative numbers and decimals work too.
Read the result
The converted value appears instantly, together with Kelvin, Rankine and a short description of what the temperature feels like.
Explore with the slider
Drag the slider or tap a key temperature such as body heat or boiling water to see how the scales line up.
Save or share
Copy the result, copy a link that reopens the same value, or grab a full chart as CSV for your notes.
The formula
How to Convert Celsius to Fahrenheit
To convert Celsius to Fahrenheit, multiply the temperature by 9/5 (which is 1.8) and then add 32.
°F = °C × 9/5 + 32
For example, here is how 25 °C becomes Fahrenheit:
- Multiply by 1.8: 25 × 1.8 = 45.
- Add 32: 45 + 32 = 77.
- So 25 °C equals 77 °F.
The multiplication is needed because one Celsius degree is 1.8 times bigger than one Fahrenheit degree. The extra 32 is needed because water freezes at 0 on the Celsius scale but at 32 on the Fahrenheit scale.
The reverse
How to Convert Fahrenheit to Celsius
Going the other way, subtract 32 first and then multiply by 5/9 (or divide by 1.8).
°C = (°F − 32) × 5/9
For instance, to convert 98.6 °F: 98.6 − 32 = 66.6, and 66.6 ÷ 1.8 = 37. As a result, 98.6 °F is exactly 37 °C. Just type into the Fahrenheit box above and the converter shows these same steps for any number.
No calculator needed
Easy Mental Math Tricks
- Double it and add 30. 20 °C becomes about 70 °F (exact: 68 °F). The trick is spot on at 10 °C and drifts further off at very hot or very cold temperatures.
- Every 5 °C is 9 °F. So once you know 20 °C = 68 °F, you also know 25 °C = 77 °F and 30 °C = 86 °F.
- Learn a few anchors. 0 = 32, 10 = 50, 20 = 68, 30 = 86 and 40 = 104. Most everyday temperatures sit close to one of these.
- Remember the mirror pairs. 16 °C is about 61 °F and 28 °C is about 82 °F, because the digits simply swap.
- Going back from Fahrenheit? Subtract 30 and halve it. For example, 80 °F gives roughly 25 °C (exact: 26.7 °C).
Quick reference
Common Temperatures in Celsius and Fahrenheit
These everyday reference points cover weather, cooking and health. For a full list, use the chart above.
| What | Celsius | Fahrenheit |
|---|---|---|
| Absolute zero | −273.15 °C | −459.67 °F |
| Celsius and Fahrenheit are equal | −40 °C | −40 °F |
| Home freezer | −18 °C | −0.4 °F |
| Water freezes | 0 °C | 32 °F |
| Fridge | 4 °C | 39.2 °F |
| Cool day | 10 °C | 50 °F |
| Room temperature | 20 °C | 68 °F |
| Warm day | 25 °C | 77 °F |
| Hot day | 30 °C | 86 °F |
| Normal body temperature | 37 °C | 98.6 °F |
| Fever threshold | 38 °C | 100.4 °F |
| Heatwave | 40 °C | 104 °F |
| Water boils (sea level) | 100 °C | 212 °F |
| Moderate oven | 180 °C | 356 °F |
Background
Celsius vs Fahrenheit: Where Each Scale Is Used
Celsius is the everyday scale in almost every country and in science. It sets water’s freezing point at 0 and its boiling point at 100, so the range is easy to remember.
Fahrenheit, in contrast, is mainly used in the United States and a few other places. Water freezes at 32 °F and boils at 212 °F, which leaves 180 degrees between the two points. That is why each Fahrenheit degree is smaller. You can read more about the history of the Fahrenheit scale.
Scientists also use Kelvin, which starts at absolute zero. To get Kelvin, simply add 273.15 to the Celsius value, so 25 °C is 298.15 K. The converter shows Kelvin with every result.
Benefits
Who Uses a Celsius to Fahrenheit Converter?
Travelers
Understand a foreign weather forecast in seconds and pack the right clothes before you leave.
Home cooks and bakers
Follow any recipe with the oven and gas mark chart, including fan-oven settings.
Parents and carers
Check a thermometer reading in the scale you know best, with a body temperature guide close at hand.
Students
Learn the formula with worked steps, check homework and practice the conversion both ways.
Questions
Celsius to Fahrenheit FAQs
What is the formula to convert Celsius to Fahrenheit?
Multiply the Celsius temperature by 9/5 (or 1.8), then add 32. As a formula: °F = °C × 9/5 + 32. For example, 20 °C × 1.8 = 36, and 36 + 32 = 68 °F.
How do you convert Fahrenheit to Celsius?
Subtract 32 from the Fahrenheit temperature, then multiply by 5/9 (or divide by 1.8): °C = (°F − 32) × 5/9. For example, 68 °F − 32 = 36, and 36 ÷ 1.8 = 20 °C.
What is 37 °C in Fahrenheit?
37 °C is 98.6 °F, the figure most often quoted as normal human body temperature. A reading of 38 °C (100.4 °F) or higher is usually treated as a fever.
What is 25 °C in Fahrenheit?
25 °C equals 77 °F. That is a warm, comfortable room temperature and a pleasant day outside.
At what temperature are Celsius and Fahrenheit equal?
The two scales meet at −40. At that point, −40 °C and −40 °F describe exactly the same temperature.
What is 0 °F in Celsius?
0 °F is about −17.78 °C. That is roughly the temperature inside a household freezer.
What is an easy way to convert Celsius to Fahrenheit in your head?
Double the Celsius number and add 30. For 15 °C that gives 60 °F, close to the exact 59 °F. The shortcut is most accurate around 10 °C and less accurate at very hot or cold temperatures.
Is 30 degrees Celsius hot?
Yes. 30 °C is 86 °F, which most people feel as hot T-shirt weather. Above about 35 °C (95 °F), heat can become uncomfortable or unsafe, so drink water and find shade.
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