Celsius to Fahrenheit converter
1 °C = 33.8 °F
Multiply by 9/5 (1.8) and add 32. The two scales meet at −40, and a normal body temperature of 37 °C is 98.6 °F.
20 °C = 68 °F
Formula: °F = °C × 9/5 + 32
20 °C in every temperature unit
- degree Fahrenheit
- kelvin
- degree Rankine
How to convert degrees Celsius to degrees Fahrenheit
°F = °C × 9/5 + 32
Example: 20 °C gives 68 °F.
degree Celsius: t/°C = T/K − 273.15 (BIPM SI Brochure)
degree Fahrenheit: t/°F = (t/°C) × 9/5 + 32 (NIST SP 811, B.9)
Going the other way? Use the fahrenheit to celsius converter.
Drag the thermometer
Two things change between the scales: where zero sits (32 °F is 0 °C) and how big a degree is (a Celsius degree is 1.8 Fahrenheit degrees). That is why you multiply and add.
20 °C=68 °F
20 × 1.8 = 36, then + 32 = 68
The “double it and add 30” shortcut gives 70 °F here, off by 2°. It is close only near 10 °C.
Celsius to Fahrenheit table
| degrees Celsius (°C) | degrees Fahrenheit (°F) |
|---|---|
| −40 | −40 |
| −30 | −22 |
| −20 | −4 |
| −10 | 14 |
| −5 | 23 |
| 0 | 32 |
| 5 | 41 |
| 10 | 50 |
| 15 | 59 |
| 18 | 64.4 |
| 20 | 68 |
| 21 | 69.8 |
| 22 | 71.6 |
| 25 | 77 |
| 30 | 86 |
| 35 | 95 |
| 37 | 98.6 |
| 38 | 100.4 |
| 40 | 104 |
| 50 | 122 |
| 60 | 140 |
| 100 | 212 |
| 150 | 302 |
| 160 | 320 |
| 180 | 356 |
| 200 | 392 |
| 220 | 428 |
| 250 | 482 |
Questions
How many degrees Fahrenheit are in 1 degree Celsius?
1 °C = 33.8 °F. Temperature scales have offsets, so this is not a simple multiplier.
What is the formula to convert degrees Celsius to degrees Fahrenheit?
°F = °C × 9/5 + 32. t/°C = T/K − 273.15; t/°F = (t/°C) × 9/5 + 32.
Is this conversion exact?
Yes. The Celsius–Fahrenheit relationship is defined exactly; results are only rounded for display.
What is 20 °C in °F?
20 °C = 68 °F.