Celsius to Fahrenheit Converter
Quick answer: Celsius to Fahrenheit: use °F = °C × 9/5 + 32. For example, 37 °C is 98.6 °F.
- Calculator
- Formula
- Examples
- Size compared
- About the units
- Where used
- Step by step
- Popular conversions
- Reading your result
- Mistakes
- FAQ
- Related tools
- Method
Use the Celsius to Fahrenheit Converter
Celsius to Fahrenheit formula and what each symbol means
°F = °C × 9/5 + 32
| Symbol | Meaning |
|---|---|
| °C | Degree Celsius |
| °F | Degree Fahrenheit |
Celsius to Fahrenheit examples
0 °C
0 °C = 32 °F.
37 °C
37 °C = 98.6 °F.
100 °C
100 °C = 212 °F.
Celsius compared with Fahrenheit
These two scales agree at exactly -40: -40 °C = -40 °F. Use that fixed point as a quick sanity check on any result.
About Celsius and Fahrenheit
Degree Celsius (°C): Celsius degree: 0 °C is the freezing point of water and a step of 1 °C equals 1 K. Degree Fahrenheit (°F): Fahrenheit degree used mainly in the United States: water freezes at 32 °F and boils at 212 °F.
Where Celsius to Fahrenheit conversions are used
Weather forecasts, ovens and body temperature use different scales depending on the country. Science and engineering work in kelvin, because it starts at absolute zero.
How to calculate Celsius to Fahrenheit step by step
- Enter the value in °C.
- Apply the formula °F = °C × 9/5 + 32.
- The result is in °F. Use the reverse formula to go back.
Popular temperature conversions
How to read your Celsius to Fahrenheit result
Mental shortcut: double the Celsius value and add 30 for a quick Fahrenheit estimate (it is within 2 °F between 0 °C and 20 °C). Water freezes at 0 °C, 32 °F and 273.15 K, and boils at 100 °C, 212 °F and 373.15 K at standard pressure.
| CELSIUS | FAHRENHEIT |
|---|---|
| -40 | -40 |
| -10 | 14 |
| 0 | 32 |
| 20 | 68 |
| 37 | 98.6 |
| 50 | 122 |
| 100 | 212 |
| 212 | 413.6 |
Fahrenheit to Celsius: quick table
| FAHRENHEIT | CELSIUS |
|---|---|
| -40 | -40 |
| -10 | -23.33333 |
| 0 | -17.77778 |
| 15 | -9.444444 |
| 25 | -3.888889 |
| 37 | 2.777778 |
| 60 | 15.55556 |
| 90 | 32.22222 |
Common mistakes when calculating Celsius to Fahrenheit
- Multiplying by 1.8 but forgetting to add 32 when converting Celsius to Fahrenheit.
- Using a single multiplier: this conversion is not a simple scale, so follow the full formula °F = °C × 9/5 + 32.
Celsius to Fahrenheit FAQ
What is the formula to convert Celsius to Fahrenheit?
°F = °C × 9/5 + 32.
What is the formula to convert Fahrenheit to Celsius?
°C = (°F − 32) × 5/9.
What is 0 °C in °F?
0 °C equals 32 °F.
What is a degree Fahrenheit (°F)?
Fahrenheit degree used mainly in the United States: water freezes at 32 °F and boils at 212 °F.
How can I estimate Celsius to Fahrenheit in my head?
Mental shortcut: double the Celsius value and add 30 for a quick Fahrenheit estimate (it is within 2 °F between 0 °C and 20 °C).
What is 15 °C in Fahrenheit?
15 °C = 59 °F, using °F = °C × 9/5 + 32.
What is 90 °C in Fahrenheit?
90 °C = 194 °F, using °F = °C × 9/5 + 32.
What is 40 °C in Fahrenheit?
40 °C = 104 °F, using °F = °C × 9/5 + 32.
How many decimals should I keep when converting °C to °F?
Match the precision of your original measurement. For example, 98.6 °F rounds to 98.6 °F at 3 significant figures; keep more digits only for engineering or scientific work.
More in Temperature converters
- Fahrenheit to Kelvin Converter
- Rankine to Celsius Converter
- Fahrenheit to Rankine Converter
- Kelvin to Rankine Converter
- Kelvin to Celsius Converter
- Kelvin to Fahrenheit Converter
See all temperature converters tools · All Conversion calculators · Site map
Method, review and disclaimer
Edited by: Hemant Kumar and Anjita Rai, founders of ToolsVault (SEO and content professional, not a licensed adviser). Method: this tool runs in your browser using the formula shown on this page; the numbers you enter are not sent to our servers. Sources: NIST SP 811, Appendix B.8: conversion factors, BIPM: the kelvin