BTU (IT) to Millijoule Converter

Energy Converter

27 units available

Decimals:

From

To

1,055,055.85262

1 BTU (IT) = 1,055,055.85262 mJ

Formula:

mJ = BTU (IT) × 1,055,055.85262

With your value: 1 BTU (IT) = 1,055,055.85262 mJ

How big is that?

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

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

Your value1.00 BTU (IT)

AA battery charge (9.5× your value)9.48 BTU (IT)

Slice of bread (2.7e+2× your value)265 BTU (IT)

Daily food intake (8.0e+3× your value)7.96e+3 BTU (IT)

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

Other BTU (IT) to Millijoule conversions

2 BTU (IT) to mJ 3 BTU (IT) to mJ 4 BTU (IT) to mJ 5 BTU (IT) to mJ 6 BTU (IT) to mJ 7 BTU (IT) to mJ 8 BTU (IT) to mJ

BTU (IT) to Millijoule Conversion Table

BTU (IT) (BTU (IT))	Millijoule (mJ)
0.5	527,527.92631
1	1,055,055.85262
2	2,110,111.70524
5	5,275,279.2631
10	10,550,558.5262
15	15,825,837.7893
20	21,101,117.0524
25	26,376,396.3155
50	52,752,792.631
100	105,505,585.262
250	263,763,963.155
500	527,527,926.31
1000	1,055,055,852.62

Millijoule to BTU (IT) Conversion Table

Millijoule (mJ)	BTU (IT) (BTU (IT))
0.5	4.739086e-7
1	9.478171e-7
2	1.895634e-6
5	4.739086e-6
10	9.478171e-6
15	1.421726e-5
20	1.895634e-5
25	2.369543e-5
50	4.739086e-5
100	9.478171e-5
250	0.000237
500	0.000474
1000	0.000948

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 (IT) (BTU (IT))

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

Millijoule (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 (IT) to Millijoule

To convert from BTU (IT) (BTU (IT)) to Millijoule (mJ), multiply the value by 1,055,055.85262.

Formula: mJ = BTU (IT) × 1,055,055.85262

Reverse: BTU (IT) = mJ × 9.478171e-7

Step-by-Step Example

Start with your value in BTU (IT). For example: 5 BTU (IT)
Multiply by the conversion factor: 5 x 1,055,055.85262
The result is: 5,275,279.2631 mJ

About BTU (IT)

The btu (it) (BTU (IT)) is a unit of energy and work. One btu (it) equals 1055.055853 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 Millijoule

The millijoule (mJ) is a unit of energy and work. One millijoule equals 0.001 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 Millijoule are in 1 BTU (IT)?

There are exactly 1,055,055.85262 Millijoule in 1 BTU (IT). This means the conversion factor from BTU (IT) to Millijoule is 1,055,055.85262.

What is the formula to convert BTU (IT) to Millijoule?

The formula to convert BTU (IT) to Millijoule is: mJ = BTU (IT) × 1,055,055.85262. For example, to convert 10 BTU (IT) to Millijoule, you would multiply 10 by 1,055,055.85262.

What is a BTU (IT)?