Step by step
- Take the temperature in degrees Celsius (°C), including negative numbers if needed.
- Multiply that number by 1.8 (which is the same as 9/5).
- Add 32 to the result to get the temperature in degrees Fahrenheit (°F).
- For instant results without manual math, type the °C value into the converter on this page.
At a glance
| Celsius (°C) | Calculation | Fahrenheit (°F) |
|---|---|---|
| 0 °C | 0 × 1.8 + 32 | 32 °F |
| 20 °C | 20 × 1.8 + 32 | 68 °F |
| 37 °C | 37 × 1.8 + 32 | 98.6 °F |
| 100 °C | 100 × 1.8 + 32 | 212 °F |
Related questions
What is the Celsius to Fahrenheit formula?
The exact equation is °F = °C × 9/5 + 32, or °F = °C × 1.8 + 32. Multiplying by 1.8 scales the degree size, and adding 32 aligns the freezing point of water.
How do I convert negative Celsius to Fahrenheit?
Use the exact same formula: multiply the negative °C value by 1.8 and add 32. For example, −10 °C × 1.8 + 32 = 14 °F, and −40 °C × 1.8 + 32 = −40 °F.
Can I convert Fahrenheit back to Celsius with the same tool?
Yes. Press the Swap units button on the converter to switch from °C to °F into °F to °C, or pick Kelvin from the unit lists.
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Updated November 14, 2026.