Fahrenheit to Celsius Converter

A Fahrenheit to Celsius converter changes temperatures from the scale commonly used in the United States to the metric temperature scale used throughout most of the world. This is helpful when reading international weather forecasts, adapting recipes, comparing medical temperatures, studying science, or following equipment instructions written for a different region. The calculator applies the standard formula directly and presents a readable Celsius result. The conversion has two operations. First, subtract 32 from the Fahrenheit value to align the freezing points of the scales. Then multiply the difference by five ninths because a Celsius degree covers a larger interval than a Fahrenheit degree. In compact form, degrees Celsius equal degrees Fahrenheit minus 32, multiplied by five ninths. Following that order matters; multiplying before subtracting produces an incorrect answer. Common benchmarks provide quick accuracy checks. Water freezes at 32 degrees Fahrenheit, which converts to 0 degrees Celsius. Water boils at 212 degrees Fahrenheit, or 100 degrees Celsius, at standard atmospheric pressure. A comfortable room at 68 degrees Fahrenheit is 20 degrees Celsius. Normal human body temperature is often quoted as 98.6 degrees Fahrenheit, equal to 37 degrees Celsius, though individual measurements naturally vary. This calculator accepts negative temperatures and decimals as well as whole numbers. A reading of minus 40 degrees Fahrenheit becomes minus 40 degrees Celsius, the unique point where both scales have the same numeric value. Display rounding keeps long repeating decimals manageable, but the underlying calculation uses the entered value before formatting. As with any conversion, the precision of the result should not be interpreted as greater than the precision of the original measurement. For a quick mental estimate, subtract 30 and divide by two. That shortcut is convenient for ordinary weather values but is not exact, especially far from typical outdoor temperatures. The calculator instead uses the exact scale relationship, making it appropriate for cooking temperatures, classroom calculations, laboratory notes, and engineering references. If you need the reverse direction, multiply Celsius by nine fifths and add 32 to obtain Fahrenheit.