Temperature Converter

Celsius and Fahrenheit are the two most common temperature scales for everyday use. Kelvin is used in science. This converter shows all three simultaneously from any input, so you never have to convert twice.

• Cooking: Convert oven temperatures from Fahrenheit recipes to Celsius settings and back.
• Weather: Understand the temperature when traveling between countries using different scales.
• Science: Convert laboratory temperatures to Kelvin for thermodynamic calculations.
• Medical: Check whether a temperature reading in one scale corresponds to fever in another.

1. 1Enter a temperature value.
2. 2Select the source unit from the dropdown: Celsius, Fahrenheit, or Kelvin.
3. 3The calculator converts to Celsius first, then derives Fahrenheit and Kelvin.
4. 4All three values are displayed at once.

• Confusing degree symbols between scales: Celsius and Fahrenheit use degrees (°C, °F); Kelvin does not (K, not °K). Kelvin is an absolute scale with no degree symbol. Writing °K is a common but technically incorrect notation.
• Using Celsius when the recipe specifies Fahrenheit: Baking at 350°F is about 177°C. Setting an oven to 350°C would be 662°F and would likely start a fire. Always check which scale your recipe or appliance uses before converting.
• Forgetting that Kelvin cannot go below 0: Kelvin starts at absolute zero (0 K = -273.15°C). Negative Kelvin values are physically impossible. If a conversion produces a negative Kelvin, the input temperature is below absolute zero, which means an error.
• Applying temperature differences incorrectly: A difference of 1°C is not the same as a difference of 1°F. A 1°C change equals 1.8°F change. When talking about temperature changes (not absolute temperatures), the conversion is: ΔF = ΔC × 9/5.

• Memorize a few anchor temperatures: 0°C = 32°F (water freezes), 20°C = 68°F (comfortable room), 37°C = 98.6°F (body temperature), 100°C = 212°F (water boils). These reference points let you sanity-check any conversion at a glance.
• Use Kelvin for gas law calculations: The ideal gas law (PV = nRT) requires temperature in Kelvin. Always convert to K before applying. A 0 K error in the denominator causes a division-by-zero; a Celsius error skews the result slightly.
• Double-check international weather apps: Weather apps often use the local convention: Celsius in most countries, Fahrenheit in the US, Liberia, and the Cayman Islands. The converter clarifies readings when traveling or reading international forecasts.
• Use for cooking conversions in recipes: Baking is the most common daily use. When adapting a recipe from a different country, convert the oven temperature first and verify it matches a recognizable setting on your appliance.