Example:
15 Btu (IT), Btu = 9.877711e+16 MeV
1 Btu (IT), Btu = 6.585141e+15 MeV | 1 MeV = 1.51857e-16 Btu (IT), Btu
Conversion Steps:
15 × (1055.05585262 / 1.602177e-13) = 9.877711e+16