Celsius to Fahrenheit Temperature Converter

Celsius and Fahrenheit are two widely used temperature scales. Celsius is the standard scale for weather reports, cooking, science, and everyday measurements in most countries. Fahrenheit remains common in the United States and a few other places, especially for weather, household thermostats, and oven settings. A reliable converter makes values from either system immediately understandable without requiring mental arithmetic. The scales use different zero points and different degree sizes. Water freezes at 0 degrees Celsius and 32 degrees Fahrenheit under standard atmospheric pressure. Water boils at 100 degrees Celsius and 212 degrees Fahrenheit under the same conditions. Because 100 Celsius degrees span the same interval as 180 Fahrenheit degrees, one Celsius degree represents nine fifths of a Fahrenheit degree. To convert Celsius to Fahrenheit, multiply the Celsius value by 9, divide by 5, and add 32. To convert Fahrenheit to Celsius, subtract 32 from the Fahrenheit value, multiply by 5, and divide by 9. The calculator follows these standard formulas directly and supports positive, negative, and decimal temperatures. Negative values are important for winter weather, refrigeration, laboratory work, and measurements below each scale's zero point. Several reference values are useful for checking a conversion. Zero Celsius equals 32 Fahrenheit, normal human body temperature is often stated as 37 Celsius or 98.6 Fahrenheit, and both scales show the same number at minus 40. Room temperature near 20 Celsius is 68 Fahrenheit. These landmarks help provide context, although actual body temperature and comfortable room temperature vary. Displayed results are rounded only when necessary to keep long decimal expansions readable. The original calculation retains JavaScript numeric precision, so common practical conversions remain accurate. Temperature conversions describe the same physical temperature in another scale; they do not account for measurement uncertainty, instrument calibration, altitude effects on boiling, or local definitions of comfortable conditions. For scientific reporting, round the converted result to a precision appropriate for the source measurement rather than treating extra decimal places as additional measured accuracy.