Convert 18°C to Fahrenheit
Temperature converter
18°C equals
64.4°F
Cool: Like a typical spring day
How to convert 18°C to °F
Follow these steps to check the answer yourself.
- 1
Write the conversion formula
To convert Celsius to Fahrenheit, multiply by 9/5 and add 32.
°F = (°C × 9/5) + 32
- 2
Substitute the Celsius value
Replace °C with 18.
°F = (18 × 9/5) + 32
- 3
Multiply by 9/5
Work out the bracket first.
18 × 9/5 = 32.4
- 4
Add 32
Add the 32° offset to get Fahrenheit.
32.4 + 32 = 64.4
Answer: 18°C = 64.4°F
18°C and nearby temperatures
Celsius values from 13°C to 23°C converted to Fahrenheit and Kelvin. Select a value to open its own conversion page.
| Celsius | Fahrenheit | Kelvin |
|---|---|---|
| 13°C to °F | 55.4°F | 286.15 K |
| 14°C to °F | 57.2°F | 287.15 K |
| 15°C to °F | 59°F | 288.15 K |
| 16°C to °F | 60.8°F | 289.15 K |
| 17°C to °F | 62.6°F | 290.15 K |
| 18°C (this page) | 64.4°F | 291.15 K |
| 19°C to °F | 66.2°F | 292.15 K |
| 20°C to °F | 68°F | 293.15 K |
| 21°C to °F | 69.8°F | 294.15 K |
| 22°C to °F | 71.6°F | 295.15 K |
| 23°C to °F | 73.4°F | 296.15 K |
Celsius to Fahrenheit conversion chart
Common temperatures from -40°C to 200°C. Bookmark or print this chart for quick reference.
| °C | °F |
|---|---|
| -40°C | -40°F |
| -30°C | -22°F |
| -20°C | -4°F |
| -10°C | 14°F |
| -5°C | 23°F |
| 0°C | 32°F |
| 5°C | 41°F |
| 10°C | 50°F |
| °C | °F |
|---|---|
| 15°C | 59°F |
| 20°C | 68°F |
| 25°C | 77°F |
| 30°C | 86°F |
| 35°C | 95°F |
| 37°C | 98.6°F |
| 40°C | 104°F |
| 45°C | 113°F |
| °C | °F |
|---|---|
| 50°C | 122°F |
| 60°C | 140°F |
| 70°C | 158°F |
| 80°C | 176°F |
| 90°C | 194°F |
| 100°C | 212°F |
| 150°C | 302°F |
| 200°C | 392°F |
Is 18°C hot or cold?
18°C (64.4°F) reads as cool on the thermometer: like a typical spring day. Typical context: mild weather and comfortable room temperature.
18°C is 14°C warmer than the inside of a typical refrigerator (4°C), and 2°C cooler than typical room temperature (20°C). On the water scale it sits 18% of the way from freezing to boiling.
Quick mental math
To estimate Celsius to Fahrenheit in your head, double the Celsius value and add 30.
18 × 2 + 30 = 66°F (exact answer: 64.4°F)
The shortcut is close for everyday temperatures but drifts further from the exact answer in very hot or very cold conditions.
To go the other way, use the Fahrenheit to Celsius converter: 64.4°F converts back to 18°C.
Frequently asked questions
What is 18°C in Fahrenheit?
18°C equals 64.4°F. This is calculated with the standard Celsius to Fahrenheit formula.
How do I convert 18 Celsius to Fahrenheit?
To convert Celsius to Fahrenheit, multiply by 9/5 (or 1.8) and add 32. For 18°C the result is 64.4°F.
Is 18°C hot or cold?
18°C is mild - comfortable with light clothing or a sweater.
What is the formula for Celsius to Fahrenheit conversion?
The formula is: °F = (°C × 9/5) + 32
Good to know
- Anders Celsius proposed his scale in 1742. It was originally inverted, with 0 for boiling water and 100 for freezing; the order was flipped soon after his death.
- Daniel Gabriel Fahrenheit introduced his scale in 1724. The United States and a handful of other countries still use it for everyday temperatures.
- -40 is the only temperature that reads the same in Celsius and Fahrenheit.
- A change of 1°C or 1 K equals a change of 1.8°F.
Sources
- SI Units – Temperature (NIST (US National Institute of Standards and Technology))
Conversion formulas between °C, °F and K, and the 273.15 offset.
Written and checked by Abdul Manan.
Last updated . Results are for general information; see the disclaimer.