| British thermal unit | Btu | Btu | 1.0 Btu (1.1 kJ) | |||
| BTU | BTU | |||||
| million British thermal units | MMBtu | MMBtu | 1.0 MMBtu (1.1 GJ) | |||
| e6BTU | BTU | |||||
| British thermal unit (IT) | Btu-IT | BtuIT | 1.0 BtuIT (1.1 kJ) | |||
| BTU-IT | BTUIT | |||||
| British thermal unit (thermochemical) | Btu-th | Btuth | 1.0 Btuth (1.1 kJ) | |||
| BTU-th | BTUth | |||||
| British thermal unit (ISO) | Btu-ISO | BTUISO | 1.0 BTUISO (1.1 kJ) | |||
| BTU-ISO | BTUISO | |||||
| British thermal unit (39°F) | Btu-39F | Btu39°F | 1.0 Btu39°F (1.1 kJ) | |||
| BTU-39F | BTU39°F | |||||
| British thermal unit (59°F) | Btu-59F | Btu59°F | 1.0 Btu59°F (1.1 kJ) | |||
| BTU-59F | BTU59°F | |||||
| British thermal unit (60°F) | Btu-60F | Btu60°F | 1.0 Btu60°F (1.1 kJ) | |||
| BTU-60F | BTU60°F | |||||
| British thermal unit (63°F) | Btu-63F | Btu63°F | 1.0 Btu63°F (1.1 kJ) | |||
| BTU-63F | BTU63°F | |||||
| British thermal unit (mean) | Btu-mean | Btumean | 1.0 Btumean (1.1 kJ) | |||
| BTU-mean | BTUmean | |||||
| quadrillion British thermal units | quad | quad | assumes the 59 °F Btu and the "long scale" quadrillion (1015) | 1.0 quad (1.1 EJ) | ||
| therm (EC) | thm-EC | thm (EC) | 1.0 thm (EC) (110 MJ) | |||
| therm (UK) | thm-UK | thm (UK) | 1.0 thm (UK) (110 MJ) | |||
| therm (US) | thm-US | thm (US) | 1.0 thm (US) (110 MJ) |
