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Convert temperature instantly between Celsius, Fahrenheit, Kelvin, and Rankine. Free online °C to °F formula calculator with real-time thermal scales.
Live thermometer with everyday reference temperatures
| Celsius (°C) | Fahrenheit (°F) | Fahrenheit (Reverse) | Celsius Equivalent | Action |
|---|---|---|---|---|
| 0.1 °C | 32.18000 °F | 0.1 °F | -17.72222 °C | |
| 0.5 °C | 32.90000 °F | 0.5 °F | -17.50000 °C | |
| 1 °C | 33.80000 °F | 1 °F | -17.22222 °C | |
| 2 °C | 35.60000 °F | 2 °F | -16.66667 °C | |
| 5 °C | 41.00000 °F | 5 °F | -15.00000 °C | |
| 10 °C | 50.00000 °F | 10 °F | -12.22222 °C | |
| 20 °C | 68.00000 °F | 20 °F | -6.66667 °C | |
| 50 °C | 122.00000 °F | 50 °F | 10.00000 °C | |
| 100 °C | 212.00000 °F | 100 °F | 37.77778 °C | |
| 500 °C | 932.00000 °F | 500 °F | 260.00000 °C | |
| 1000 °C | 1,832.00000 °F | 1000 °F | 537.77778 °C |
Symbol: °C. Commonly used in: metric.
Symbol: °F. Commonly used in: imperial.
Symbol: K. Commonly used in: si.
Symbol: °R. Commonly used in: imperial.
Every conversion starts with the standard baseline rate between these two units:
Multiply your entered number by the conversion rate to calculate the exact target value:
The result is neatly rounded to your preferred decimal setting so it is clear and ready to use:
| Unit Name | Symbol | System | Conversion Rate | Common Uses |
|---|---|---|---|---|
| Celsius | °C | metric | 1 °C = 1.000000 °C | Everyday, home, and school measurements in Temperature. |
| Fahrenheit | °F | imperial | 1 °F = -17.222222 °C | Everyday, home, and school measurements in Temperature. |
| Kelvin | K | si | 1 K = -272.150000 °C | Everyday, home, and school measurements in Temperature. |
| Rankine | °R | imperial | 1 °R = -272.594444 °C | Everyday, home, and school measurements in Temperature. |
Daniel Gabriel Fahrenheit built the first modern mercury thermometer in 1714. In 1742, Swedish astronomer Anders Celsius created the 100-degree scale between freezing (0°) and boiling (100°).
Unlike feet or pounds, temperature has different starting zero points: 0°C is 32°F. That is why you must add or subtract 32 in the formula.
Multiply Celsius by 1.8 (or 9/5), then add 32: °F = (°C × 1.8) + 32. For example, 20°C × 1.8 = 36; 36 + 32 = 68°F.
Celsius and Fahrenheit meet at -40°: -40°C is exactly -40°F.
Kelvin is an absolute scale starting at absolute zero, not an arbitrary interval scale. We write 300 K, without the degree sign.
Every calculation uses trusted, standard definitions so your results are 100% accurate for school, home, work, and recipes.
