Home› Conversions› Energy› BTU to Megajoules
Energy
BTU to Megajoules
Convert BTU (BTU) to megajoules (MJ). Type a value below to see the result update instantly. Reference table and formula included.
Calculator
1 BTU = 0.001055 MJ
BTU to Megajoules Conversion Table
Common values, ready to copy:
| BTU | megajoules |
|---|---|
| 1 BTU | 0.001055 MJ |
| 2 BTU | 0.00211 MJ |
| 5 BTU | 0.005275 MJ |
| 10 BTU | 0.010551 MJ |
| 25 BTU | 0.026377 MJ |
| 50 BTU | 0.052753 MJ |
| 100 BTU | 0.105506 MJ |
| 1,000 BTU | 1.0551 MJ |
Formula
megajoules = BTU × 0.00105506
Energy uses the SI joule. Food calories (kcal) are 1,000 small calories: 1 kcal = 4,184 J. 1 kWh = 3.6 MJ = 3,600,000 J. 1 BTU = 1,055.06 J.
About BTU and Megajoules
BTU (BTU): British Thermal Unit; the energy to raise one pound of water by one degree Fahrenheit; defined as exactly 1,055.06 J. Common uses: US heating and air conditioning (a 24,000 BTU air conditioner cools roughly a 1,500 sq ft room), and US natural gas billing.
Megajoules (MJ): A million joules; the unit for larger-scale energy quantities. Common uses: Daily food intake (a typical adult consumes 8-10 MJ per day), fuel energy content (gasoline ≈ 34 MJ per liter), and industrial energy.
How the conversion works
Energy uses the SI joule. Food calories (kcal) are 1,000 small calories: 1 kcal = 4,184 J. 1 kWh = 3.6 MJ = 3,600,000 J. 1 BTU = 1,055.06 J.
The exact relationship is megajoules = BTU × 0.00105506, which the calculator at the top of this page applies in both directions. Type into either field and the other updates immediately.
When this conversion matters
Converting between BTU and megajoules comes up wherever energy measurements move between systems — from one country's conventions to another's, from a scientific reference to a practical specification, or from one industry's working unit to another's. The calculator and reference table above cover the everyday range; for unusual values you can type any number into either field.