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1MBtu = 1000 Btus.

In MBtu, M is used as Roman numeral where M = 1000.

1MBtu = 0.293 kWh

and 1 MMBtu = 1,000,000 Btus

1MBtu = 1000 Btus. (Here M is not million)

In MBtu, M is used as Roman numeral where M = 1000.

1MBtu = 0.293 kWh

and 1 MMBtu = 1,000,000 Btus