Notes: 1 cal (thermochemical) = 4.184 J; 1 kcal = 4184 J; 1 Wh = 3600 J; 1 BTU (IT) = 1055.05585262 J (exact); 1 eV = 1.602176634×10⁻¹⁹ J (exact); 1 toe = 41.868 GJ; 1 boe ≈ 5.8×10⁶ BTU (≈ 6.119×10⁹ J); 1 ton TNT ≈ 4.184 GJ.