Instant accurate conversion between all units
| Unit | Value |
|---|
The three temperature scales: Celsius (°C) — used by most of the world. Fahrenheit (°F) — used in the US. Kelvin (K) — used in science.
Conversion Formulas:
°F = (°C × 9/5) + 32
°C = (°F − 32) × 5/9
K = °C + 273.15
°C = K − 273.15
| Celsius | Fahrenheit | Kelvin | Description |
|---|---|---|---|
| -273.15°C | -459.67°F | 0 K | Absolute zero |
| -40°C | -40°F | 233 K | Same in both scales |
| 0°C | 32°F | 273.15 K | Water freezes |
| 20°C | 68°F | 293 K | Room temperature |
| 37°C | 98.6°F | 310 K | Human body temperature |
| 100°C | 212°F | 373 K | Water boils (sea level) |
For a quick estimate: double the Celsius and add 30. Example: 25°C → (25 × 2) + 30 = 80°F (actual: 77°F — close enough for weather). For exact values, use the converter above.
Related: unit converter, metric vs imperial guide.
°F = (°C × 9/5) + 32. Example: 25°C = (25 × 1.8) + 32 = 77°F. Quick estimate: double Celsius and add 30.
37°C = 98.6°F — normal human body temperature. Key reference: 0°C=32°F (freezing), 100°C=212°F (boiling), 20°C=68°F (room temp).
Kelvin is the scientific temperature scale with absolute zero (0K = −273.15°C) as its base. Used in physics, chemistry, and astronomy. K = °C + 273.15.
| °C | °F | Description |
|---|---|---|
| -20°C | -4°F | Very cold winter day |
| 0°C | 32°F | Water freezing point |
| 10°C | 50°F | Cool autumn day |
| 20°C | 68°F | Comfortable room temperature |
| 30°C | 86°F | Hot summer day |
| 37°C | 98.6°F | Normal body temperature |
| 100°C | 212°F | Water boiling point (sea level) |
| 180°C | 356°F | Common baking temperature |
Related: Unit Converter · Metric vs Imperial Guide
Celsius (°C) is the metric standard, used by 195+ countries. Water freezes at 0°C and boils at 100°C — a logical, easy-to-remember scale. Fahrenheit (°F) is used in the US, placing freezing at 32°F and boiling at 212°F. Kelvin (K) is used in science — it starts at absolute zero (−273.15°C), the coldest temperature physically possible. There are no negative Kelvin values.
Quick Celsius to Fahrenheit mental math: multiply °C by 2 and add 30 for a rough estimate. 25°C × 2 + 30 = 80°F (actual: 77°F). For exact conversions, use the converter above. Also see our unit converter for all other measurement conversions.