# Celsius to Fahrenheit converter

Converts degrees Celsius (°C) to degrees Fahrenheit (°F) and back, with the exact unit definitions.

- Page: https://www.acalculator.org/convert/celsius-to-fahrenheit
- JSON spec: https://www.acalculator.org/convert/celsius-to-fahrenheit.json
- Version: 90dd84b0202c

## Default answer

Example with the default inputs (Degrees Celsius (°C) 37): 37 °C = 98.6 °F.

## Inputs

| Key | Label | Description |
| --- | --- | --- |
| value | Degrees Celsius (°C) | The amount in degrees Celsius to convert. |
| result | Degrees Fahrenheit (°F) | The same amount in degrees Fahrenheit. |

## Outputs

| Key | Label | Description |
| --- | --- | --- |
| value | Degrees Celsius (°C) | The amount in degrees Celsius to convert. |
| result | Degrees Fahrenheit (°F) | The amount in degrees Fahrenheit. |

## Method

°F = °C × 9 ÷ 5 + 32

## Assumptions

- Temperature scales have different zero points, so the conversion adds or subtracts as well as multiplies.
- The answer shows at most 6 decimal places; the calculation keeps full precision.

## Worked examples

1. value = 100 gives result = 212. Source: exact unit definitions in NIST SP 811 (2008), Appendix B.8.
2. value = 37 gives result = 98.6. Source: exact unit definitions in NIST SP 811 (2008), Appendix B.8.
3. result = 98.6 gives value = 37. Source: exact unit definitions in NIST SP 811 (2008), Appendix B.8.

## FAQ

### What is the formula to convert Celsius to Fahrenheit?

°F = °C × 9 ÷ 5 + 32. For example, 37 °C is 98.6 °F.

### How do I convert Celsius to Fahrenheit?

Use °F = °C × 9 ÷ 5 + 32. 37 °C gives 98.6 °F.

### How do I convert Fahrenheit back to Celsius?

Reverse the formula, or type the degrees Fahrenheit into the second box and the converter works it out.

### At what temperature are Fahrenheit and Celsius equal?

At −40. −40 °F is −40 °C, because (−40 − 32) × 5 ÷ 9 = −40.

## Sources

- NIST SP 811 (2008), Guide for the Use of the International System of Units, Appendix B.8. https://www.nist.gov/pml/special-publication-811