Munka, energia, hőmennyiség:

1 J = 1 N·m = 0,278·10–6 kWh = 1,102 kg·m = 0,239·10–3 kcal

1 kWh = 3,6·106 J = 367·103 kg·m = 860 kcal

1 kg·m = 9,807 J = 2,72·10–6 kWh = 2,34·10–3 kcal

1 kcal = 4,19·103 J = 1,16·10–3 kWh = 427 kg·m