Convert Celsius to Fahrenheit, Kelvin, and Rankine instantly online free. Includes conversion formulas and a temperature reference chart. No signup.
This temperature converter online free converts between Celsius, Fahrenheit, Kelvin, and Rankine simultaneously. Type any value into any field and all others update instantly — so whether you need a Celsius to Fahrenheit converter, a Kelvin to Celsius calculator, or a quick Fahrenheit to Celsius conversion, one tool covers everything. The built-in reference chart shows common benchmark temperatures — absolute zero, water freezing, room temperature, body temperature, water boiling, and oven temperature — so you can click any benchmark and instantly see its equivalent across all four scales. For travellers checking international weather forecasts, 0°C = 32°F and 100°C = 212°F. For baking, a medium oven is 180°C = 356°F. For science, absolute zero is 0 K = −273.15°C. The conversion formulas panel shows the exact equation used for each calculation. Works as a weather temperature converter free for anyone switching between countries that use different temperature standards. No account, instant results.
The Temperature Converter converts between Celsius, Fahrenheit, Kelvin, and Rankine simultaneously. Enter a value in any field and the other three update instantly. Celsius (°C) is the SI-derived unit used worldwide for everyday temperature. Fahrenheit (°F) is used in the United States for weather and cooking. Kelvin (K) is the SI base unit used in science and engineering — it starts at absolute zero (−273.15 °C) so there are no negative Kelvin values. Rankine (°R) is an absolute scale using Fahrenheit-sized degrees, used in certain US engineering and thermodynamics contexts. The converter handles all four scales and includes a reference table of common temperatures for quick lookups.
Formula
°F = (°C × 9/5) + 32 °C = (°F − 32) × 5/9 K = °C + 273.15 °R = (°C + 273.15) × 9/5
| Reference Point | Celsius (°C) | Fahrenheit (°F) | Kelvin (K) |
|---|---|---|---|
| Absolute zero | −273.15 | −459.67 | 0 |
| Freezing point of water | 0 | 32 | 273.15 |
| Room temperature | 20–22 | 68–72 | 293–295 |
| Normal body temperature | 37 | 98.6 | 310.15 |
| Boiling point of water | 100 | 212 | 373.15 |
| Oven: moderate | 180 | 356 | 453.15 |
| Oven: hot | 220 | 428 | 493.15 |
| Sun's surface | 5,505 | 9,941 | 5,778 |
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