BTU (th) to Megajoule Converter

Energy Converter

27 units available

Decimals:

From

To

0.001054

1 BTU = 0.001054 MJ

Formula:

MJ = BTU × 0.00105435

With your value: 1 BTU = 0.00105435 MJ

How big is that?

Everyday references on a logarithmic scale, all expressed in btu (th) so you can sanity-check the result.

Heartbeat (1/1.1e+3 your value)0.000948 BTU

Your value1.00 BTU

AA battery charge (9.5× your value)9.48 BTU

Slice of bread (2.7e+2× your value)266 BTU

Daily food intake (8.0e+3× your value)7.97e+3 BTU

Litre of petrol (3.2e+4× your value)3.24e+4 BTU

Other BTU (th) to Megajoule conversions

2 BTU to MJ 3 BTU to MJ 4 BTU to MJ 5 BTU to MJ 6 BTU to MJ 7 BTU to MJ 8 BTU to MJ

BTU (th) to Megajoule Conversion Table

BTU (th) (BTU)	Megajoule (MJ)
0.5	0.000527
1	0.001054
2	0.002109
5	0.005272
10	0.010544
15	0.015815
20	0.021087
25	0.026359
50	0.052717
100	0.105435
250	0.263588
500	0.527175
1000	1.05435

Megajoule to BTU (th) Conversion Table

Megajoule (MJ)	BTU (th) (BTU)
0.5	474.225826
1	948.451653
2	1,896.903305
5	4,742.258263
10	9,484.516527
15	14,226.77479
20	18,969.033054
25	23,711.291317
50	47,422.582634
100	94,845.165268
250	237,112.913169
500	474,225.826339
1000	948,451.652677

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

BTU (th) (BTU)

Energy

Exact conversion

The International Table BTU is exactly 1055.055 852 62 J.

Thermochemical and 39 °F BTU definitions differ by up to 0.2 %.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

Megajoule (MJ)

Energy

Exact conversion

Derived from the joule (1 J = 1 kg·m²/s²). Thermochemical and IT calories, BTU and kWh are exact defined multiples.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

How to Convert BTU (th) to Megajoule

To convert from BTU (th) (BTU) to Megajoule (MJ), multiply the value by 0.00105435.

Formula: MJ = BTU × 0.00105435

Reverse: BTU = MJ × 948.451652677

Step-by-Step Example

Start with your value in BTU (th). For example: 5 BTU
Multiply by the conversion factor: 5 x 0.00105435
The result is: 0.005272 MJ

About BTU (th)

The btu (th) (BTU) is a unit of energy and work. One btu (th) equals 1054.35 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: energy calculations, engineering and science, education.

About Megajoule

The megajoule (MJ) is a unit of energy and work. One megajoule equals 1.000000 × 10^+6 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: energy calculations, engineering and science, education.

Frequently Asked Questions

How many Megajoule are in 1 BTU (th)?

There are exactly 0.00105435 Megajoule in 1 BTU (th). This means the conversion factor from BTU (th) to Megajoule is 0.00105435.

What is the formula to convert BTU (th) to Megajoule?

The formula to convert BTU (th) to Megajoule is: MJ = BTU × 0.00105435. For example, to convert 10 BTU (th) to Megajoule, you would multiply 10 by 0.00105435.

What is a BTU (th)?