Temperature converter: Celsius, Fahrenheit and Kelvin

Calculations use exact ratios internally; the displayed result is rounded to the selected significant digits. Input allows up to 30 digits and exponents from −30 to +30. Use a decimal point, decimal comma, or Arabic decimal separator; do not use thousands separators. Negative values are accepted only for valid temperatures.

Common conversions

Conversion rule

K = Value × (1) + (273.15); result = (K − (45967/180)) ÷ (5/9)

Definition references: NIST — SI · NIST — KiB / MiB