About this tool
Temperature conversion is non-linear because the scales have different zero points. This tool handles all four common scales.
Formula
C → F: F = C × 9/5 + 32 C → K: K = C + 273.15 F → C: C = (F − 32) × 5/9 K → R: R = K × 9/5
Worked example
20 °C → 20 × 9/5 + 32 = 68 °F. Body temperature 37 °C ≈ 98.6 °F.
Notes
Kelvin and Rankine are absolute scales (0 = absolute zero). Celsius and Fahrenheit are relative; their zero points are arbitrary.