°F = (°C × 9/5) + 32; °C = (°F − 32) × 5/9; K = °C + 273.15
100°C to Fahrenheit: (100 × 9/5) + 32 = 212°F.
Celsius, Fahrenheit, and Kelvin scales have different zero points, so conversion requires explicit formulas rather than a single multiplication factor.
0 K = −273.15°C = −459.67°F.