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Convert between Celsius, Fahrenheit, and Kelvin instantly.
🌡️ Key reference points: 0°C = 32°F (freezing), 100°C = 212°F (boiling), 37°C = 98.6°F (body temp).
Three temperature scales are in common use. Celsius (°C) is used for everyday weather and cooking in nearly every country. Fahrenheit (°F) is used for the same purposes in the United States. Kelvin (K) is used in science and measures absolute temperature, starting from absolute zero.
To estimate °C to °F: double the Celsius number and add 30. For 20°C: 2×20 + 30 = 70°F (actual: 68°F — close enough for weather). To go the other way, subtract 30 and halve. This approximation works well for everyday temperatures but breaks down at extremes.
The Fahrenheit scale was developed in the early 1700s by Daniel Gabriel Fahrenheit. The US adopted it before Celsius became the global standard, and the cost of switching — re-calibrating every thermostat, oven, weather forecast, and industrial process — has kept it in place. Most other countries switched to Celsius in the 1960s-70s.
Kelvin is an absolute scale: 0 K is absolute zero, the theoretical point where all thermal motion stops. There are no negative Kelvin temperatures (though negative Celsius and Fahrenheit are common). Kelvin uses the same degree size as Celsius, just shifted by 273.15, making scientific calculations cleaner.
Common oven settings for reference:
The Temperature Converter converts temperature converterfrom one unit to another using the exact internationally defined conversion factors. Type a value, choose your source and target units, and the converted result is shown instantly — no waiting, no page reload.
Manual conversion is error-prone because it means memorizing ratios (how many feet in a meter, how many pints in a liter). This tool removes that friction: the conversion factor is built in, and the math is done to full precision with no rounding until the final displayed number.
Common uses: people reach for this tool when they need to look up a celsius to fahrenheit converter, celsius fahrenheit kelvin converter, how to convert c to f, or fahrenheit to celsius formula.
Browser-based tools like this one have a few real advantages over installed software or manual methods:
The Temperature Converter is based on the following formula:
°C = (°F − 32) × 5/9 K = °C + 273.15
Variables: °C = temperature in degrees Celsius °F = temperature in degrees Fahrenheit K = temperature in kelvin
Fahrenheit → Celsius → Kelvin conversion.
Worked example: Convert 98.6 °F to Celsius and kelvin: °C = (98.6 − 32) × 5/9 = 66.6 × 5/9 = 37 °C K = 37 + 273.15 = 310.15 K Reverse: 37 °C × 9/5 + 32 = 66.6 + 32 = 98.6 °F
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