Heat
Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin instantly.
1 Celsius
33.8Fahrenheit
Celsius1
Fahrenheit33.8
Kelvin274.15
Temperature conversions use formulas for accurate transformations between temperature scales.
Heat
Convert between Celsius, Fahrenheit, and Kelvin instantly.
1 Celsius
33.8Fahrenheit
Temperature conversions use formulas for accurate transformations between temperature scales.
A temperature converter is a tool that translates numerical temperature values from one scale to another. Celsius measures heat relative to water's freezing point (0°) and boiling point (100°). Fahrenheit uses different reference points (32° freezing, 212° boiling) and is standard in the US. Kelvin is the absolute temperature scale used in science, where 0 K is the lowest possible temperature (absolute zero). All three express the same physical quantity in different units.
The converter uses precise mathematical formulas to translate between scales. To convert Celsius to Fahrenheit, multiply by 9/5 and add 32. For Kelvin conversion, Celsius and Kelvin differ by exactly 273.15 degrees—Kelvin is always Celsius plus 273.15. Enter your temperature in any scale, select the target scale, and the tool calculates the exact equivalent instantly with no rounding or guesswork.
°F = (°C × 9/5) + 32; K = °C + 273.15; °C = K − 273.15; °C = (°F − 32) × 5/9The Celsius-to-Fahrenheit formula accounts for both the different zero-points (32° offset) and different interval sizes (9/5 ratio). The Kelvin formula is simpler: Kelvin adds a fixed 273.15 offset to Celsius. These equations are internationally standardized and exact.
| Input | Result | Notes |
|---|---|---|
| Water boiling point: 100°C | 212°F or 373.15 K | Standard reference point; shows the offset difference between scales |
| Comfortable room temperature: 72°F | 22.2°C or 295.4 K | Common household temperature; demonstrates mid-range conversion |
| Absolute zero in Kelvin: 0 K | -273.15°C or -459.67°F | The coldest possible temperature; no heat energy remains |
Celsius and Fahrenheit are human-friendly scales tied to water and human experience. Fahrenheit is traditional in the US. Kelvin is used in science because it has a true zero point (absolute zero), making physics equations cleaner. All three remain in daily use worldwide.
Absolute zero (0 K or −273.15°C) is the lowest possible temperature where all molecular motion stops. It's the foundation of Kelvin's design and explains why Kelvin has no negative numbers—it's built on a physical limit, not an arbitrary reference.
Yes. Negative Celsius and Fahrenheit temperatures convert normally using the standard formulas. Negative Kelvin, however, does not exist—Kelvin cannot go below 0 K.
Scientists often use 25°C (298.15 K or 77°F) as a reference baseline because it's close to typical indoor conditions. This makes it easy to compare experiments conducted under similar, predictable conditions.
This tool uses exact mathematical formulas with no rounding, so it's accurate to many decimal places. For practical uses (cooking, weather, medicine) the result is more precise than any real-world thermometer.
Most countries outside the US use Celsius ovens. A common setting is 180°C (356°F). Always convert the recipe temperature using this tool to match your oven's scale and avoid undercooked or burnt food.