Formula – How to calculate Kelvin
| To Kelvin (K) | From Kelvin (K) | |
| Celsius (°C) | °C = 273.15 = K | K – 273.15 = °C |
| Fahrenheit (°F) | (°F + 459.67) / 1.8 = K | (K x 1.8) – 459.67 = °F |
| Rankine (°R) | °R ÷ 1.8 = K | K x 1.8 = °R |
| Rømer (°Rø) | ((°Rø – 7.5) x 40/21) + 273.15 = K | ((K – 273.15) x 21/40) + 7.5 = °Rø |
| Réaumur (°Ré) | (°Ré x 5/4) + 273.15 = K | (K – 273.15) x 4/5 = °Ré |
| Delisle (°D) | 373.15 – (°D x 2/3) = K | (373.15 – K) x 3/2 = °D |
| Newton (°N) | (°N x 100/33) + 273.15 = K | (K – 273.15) x 33/100 = °N |