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Celsius to Fahrenheit Converter
Sign up to favourite this calculatorConvert Celsius to Fahrenheit instantly. Enter a temperature in Celsius — or switch direction to go from Fahrenheit — and the result updates as you type.
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Assumptions and limits
- An estimate from the numbers you entered, for guidance only. It is not financial, tax or medical advice.
- Calculator version 1, last updated 26 October 2026.
- Source: NIST Guide to the SI, Appendix B.8: Factors for Units Listed Alphabetically.
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How to use this calculator
- Leave the direction on Celsius → Fahrenheit, or switch it to go the other way.
- Type the temperature to convert into the amount field. Whole numbers, decimals and negative values all work.
- Read the result: the converted temperature updates as you type, rounded to 2 decimals.
What do I enter to convert a temperature?
- Direction — Celsius → Fahrenheit or Fahrenheit → Celsius. It sets which scale you type in.
- Temperature to convert — a number in that scale, whole or decimal, negative allowed, from −1,000,000,000 to 1,000,000,000.
What does the result show?
- Temperature in Fahrenheit (or Temperature in Celsius in reverse) — the converted temperature, rounded to 2 decimals with trailing zeros dropped.
- Formula — the equation for the direction you picked.
How to convert Celsius to Fahrenheit
To convert Celsius to Fahrenheit, multiply the Celsius temperature by 9/5 (or 1.8), then add 32.
°F = (°C × 9/5) + 32
- 9/5 is the same as 1.8, so °F = (°C × 1.8) + 32 gives the identical result.
- To reverse it, subtract 32 first, then multiply by 5/9: °C = (°F − 32) × 5/9.
Example: convert 25 °C to Fahrenheit
- Multiply by 9/5: 25 × 9 ÷ 5 = 45.
- Add 32: 45 + 32 = 77.
- Result: 25 °C = 77 °F.
Common Celsius to Fahrenheit conversions
Temperatures people look up most often.
| Celsius | Fahrenheit | Reference |
|---|---|---|
| -40 °C | -40 °F | Same temperature on both scales |
| 0 °C | 32 °F | Water freezes |
| 10 °C | 50 °F | Cool weather |
| 20 °C | 68 °F | Mild temperature |
| 25 °C | 77 °F | Warm weather |
| 30 °C | 86 °F | Hot weather |
| 37 °C | 98.6 °F | Typical body temperature |
| 100 °C | 212 °F | Water boils at sea level |
Sources
The relationship, t/°C = (t/°F − 32) ÷ 1.8, is listed as exact in the NIST Guide to the SI, Appendix B.8: Factors for Units Listed Alphabetically. Rearranged, °F = (°C × 1.8) + 32.
Frequently asked questions
How do you convert Celsius to Fahrenheit?
Multiply the Celsius value by 1.8, then add 32. The formula is °F = (°C × 1.8) + 32.
What is 0 °C in Fahrenheit?
0 °C is 32 °F, which is the freezing point of water.
What is 20 °C in Fahrenheit?
20 °C is 68 °F.
What is 100 °C in Fahrenheit?
100 °C is 212 °F, which is the boiling point of water at sea level.
When are Celsius and Fahrenheit the same?
Celsius and Fahrenheit are the same at −40 degrees: −40 °C = −40 °F.
Last updated 26 October 2026. Source: NIST Guide to the SI, Appendix B.8: Factors for Units Listed Alphabetically.