Convert between Celsius and Fahrenheit. Useful for weather, cooking, science, and everyday temperature comparisons.
Celsius and Fahrenheit are two different temperature scales used around the world. Celsius is the metric standard used in science and most countries, while Fahrenheit is primarily used in the United States.
The two scales differ in two ways:
On the Celsius scale, water freezes at 0°C and boils at 100°C. On the Fahrenheit scale, those same points are 32°F and 212°F.
In both scales, absolute zero (the lowest possible temperature) occurs at −273.15°C or −459.67°F.
First multiply by 9/5 to scale the degree size, then add 32 to shift the zero point.
Same result as formula #1 (since 9/5 = 1.8). Use whichever form is easier for you.
First subtract 32 to undo the offset, then multiply by 5/9 to scale down.
Quick approximation for everyday use. Off by roughly 10% but useful for rough conversions.
Convert 25°C to Fahrenheit (step-by-step)
Step 1: Multiply by 9/5 (or 1.8)
Step 2: Add 32
| Celsius | Fahrenheit |
|---|---|
| -40 °C | -40 °F |
| -10 °C | 14 °F |
| 0 °C | 32 °F |
| 10 °C | 50 °F |
| 20 °C | 68 °F |
| 25 °C | 77 °F |
| 30 °C | 86 °F |
| 37 °C | 98.6 °F |
| 50 °C | 122 °F |
| 100 °C | 212 °F |
They give identical results. Use whichever is more convenient. 1.8 is simpler; 9/5 shows the underlying ratio.
Multiply by 9/5 (or 1.8), then add 32.
Double the Celsius value and add 30. This is roughly 10% off but works for everyday temperatures.
Around 20–22°C (68–72°F).
212°F.
-40°.
It’s more intuitive for everyday temperature ranges.
Because the two scales start at different baseline values.
Yes, it works for both.
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