Oven at 180 °C in Fahrenheit
180 × 9 ÷ 5 + 32 = 356 °F
Temperature Converter
Convert between Celsius, Fahrenheit and Kelvin, with checks for values below absolute zero.
Result
1 celsius (°C) equals
33.8°F
1 °C in every temperature unit
| Unit | Value |
|---|---|
| Celsius (°C) | 1 |
| Fahrenheit (°F) | 33.8 |
| Kelvin (K) | 274.15 |
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How the Temperature Converter works
Enter a temperature and choose the scales. Celsius, Fahrenheit and Kelvin have different zero points, so the converter uses the exact formulas below rather than a single factor.
Temperatures can be negative, but not below absolute zero (−273.15 °C, −459.67 °F or 0 K). Values below that are rejected because they can't exist.
Common conversions
Celsius to Fahrenheit
| Celsius (°C) | Fahrenheit (°F) |
|---|---|
| −40 °C | −40 °F |
| −20 °C | −4 °F |
| −10 °C | 14 °F |
| 0 °C | 32 °F |
| 10 °C | 50 °F |
| 20 °C | 68 °F |
| 25 °C | 77 °F |
| 30 °C | 86 °F |
| 37 °C | 98.6 °F |
| 40 °C | 104 °F |
| 100 °C | 212 °F |
| 180 °C | 356 °F |
| 200 °C | 392 °F |
Fahrenheit to Celsius
| Fahrenheit (°F) | Celsius (°C) |
|---|---|
| −40 °F | −40 °C |
| 0 °F | −17.7778 °C |
| 32 °F | 0 °C |
| 50 °F | 10 °C |
| 68 °F | 20 °C |
| 72 °F | 22.2222 °C |
| 98.6 °F | 37 °C |
| 212 °F | 100 °C |
| 350 °F | 176.6667 °C |
| 400 °F | 204.4444 °C |
Formulas
Celsius to Fahrenheit
°F = °C × 9 ÷ 5 + 32
Fahrenheit to Celsius
°C = (°F − 32) × 5 ÷ 9
Celsius to Kelvin
K = °C + 273.15
Kelvin uses the same step size as Celsius, shifted so that 0 K is absolute zero. It's written without a degree sign.
Examples
Room at 72 °F in Celsius
(72 − 32) × 5 ÷ 9 = 22.22 °C
Where the scales meet
−40 × 9 ÷ 5 + 32 = −40 °F — the only temperature that reads the same in both.
Frequently asked questions
Is there a quick way to estimate Fahrenheit?
Double the Celsius value and add 30. It's close for everyday temperatures (20 °C → 70 °F, exact 68 °F) but drifts further off at high or low values.
Why is there no “degrees Kelvin”?
Kelvin is an absolute scale, so its unit is simply the kelvin (K). The degree sign is only used with Celsius and Fahrenheit.
How do I convert a temperature difference?
A change of 1 °C is a change of 1.8 °F (no +32). This converter converts temperatures, not differences, so for a rise of 10 °C multiply by 1.8 yourself: 18 °F.
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