Nanotons of TNT to 4 °C calories equation
To convert nanotons of TNT to 4 °C calories:
Multiply the number of nanotons of TNT by 0.9952426260704093
About 4 °C calories
One 4 °C calorie is the amount of energy needed to raise 1g of air-free water from 3.5 to 4.5°C at standard atmospheric pressure.