Enter a value in British thermal unit (BTU) in the "From" field, and the equivalent value in megajoule (MJ) will be displayed in the "To" field automatically.

The conversion factor between British thermal unit and megajoule is calculated automatically based on their relationship to the base unit in the energy / work / heat category.

Yes, you can convert between any units in the energy / work / heat category. Use the dropdown menus to select different units.