Temperature Converter

To convert Celsius to Fahrenheit, multiply the Celsius value by 9/5 (or 1.8) and then add 32. For example, 100°C equals 212°F using the formula: °F = (°C × 9/5) + 32. This is the standard formula used in science, cooking, and weather reporting worldwide.

To convert Fahrenheit to Celsius, subtract 32 from the Fahrenheit value, then multiply the result by 5/9. For example, 98.6°F equals 37°C using the formula: °C = (°F − 32) × 5/9. A quick mental shortcut is to subtract 30 and halve the result for a rough estimate.

1 degree Celsius equals 33.8 degrees Fahrenheit when converting an absolute temperature using the formula °F = (1 × 9/5) + 32 = 33.8°F. Note that a change of 1°C is equivalent to a change of 1.8°F when measuring temperature differences rather than absolute values.

38°C equals 100.4°F, which is considered a fever in adults according to most medical guidelines. Using the conversion formula: °F = (38 × 9/5) + 32 = 100.4°F. A normal body temperature is typically 37°C (98.6°F), so 38°C indicates a mild fever.

The most commonly used temperature scales are Celsius (°C), Fahrenheit (°F), Kelvin (K), and Rankine (°R). Celsius and Fahrenheit are used in everyday life for weather and cooking, Kelvin is the SI unit used in science, and Rankine is used in certain engineering applications. A good temperature converter handles all combinations instantly.

To convert Celsius to Kelvin, simply add 273.15 to the Celsius value: K = °C + 273.15. For example, 0°C (the freezing point of water) equals 273.15 K, and 100°C (boiling point) equals 373.15 K. Kelvin is always a positive number since it starts at absolute zero, the coldest possible temperature.

Normal adult body temperature is approximately 37°C or 98.6°F, though it can vary slightly between individuals and times of day. A temperature above 38°C (100.4°F) is generally considered a fever. Using a temperature converter is helpful when reading thermometers that display a different scale than you are accustomed to.