BTU to megajoules – convert BTU to MJ
Convert BTU to megajoules (BTU to MJ) to compare gas, heating, HVAC and fuel energy with SI-based units. This page opens the main energy converter with BTU → MJ pre-selected.
Open the interactive BTU → MJ converter:
Use main converter (BTU → MJ) or switch to MJ → BTU (if you add that route later)On the homepage you can also convert between joules, kilojoules, megajoules, kilowatt-hours and BTU.
Quick reference: BTU to MJ
Using the IT BTU, 1 BTU ≈ 0.00105506 MJ, so: MJ = BTU × 0.00105506. Examples:
| Energy (BTU) | Energy (MJ, approx.) |
|---|---|
| 1,000 BTU | 1.055 MJ |
| 5,000 BTU | 5.275 MJ |
| 10,000 BTU | 10.55 MJ |
| 20,000 BTU | 21.10 MJ |
| 50,000 BTU | 52.75 MJ |
Why convert BTU to megajoules?
BTU to megajoules is useful when you:
- Compare gas boiler or heater ratings with electric appliances in kWh or MJ.
- Analyse fuel energy content across imperial and metric units.
- Work with HVAC or cooling systems rated in BTU per hour.
- Prepare energy reports or bills in consistent SI-based units.
Other energy converters on this site
This page uses the International Table (IT) BTU, which is common in engineering and HVAC. Other BTU definitions differ slightly but are rarely used in modern work.
Page last updated: 4 December 2025.