BTU (th) to BTU (IT) Converter

Energy Converter

27 units available

Decimals:

From

To

0.999331

1 BTU = 0.999331 BTU (IT)

Formula:

BTU (IT) = BTU × 0.9993309808

With your value: 1 BTU = 0.99933098 BTU (IT)

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 BTU (IT) conversions

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

BTU (th) to BTU (IT) Conversion Table

BTU (th) (BTU)	BTU (IT) (BTU (IT))
0.5	0.499665
1	0.999331
2	1.998662
5	4.996655
10	9.99331
15	14.989965
20	19.98662
25	24.983275
50	49.966549
100	99.933098
250	249.832745
500	499.66549
1000	999.330981

BTU (IT) to BTU (th) Conversion Table

BTU (IT) (BTU (IT))	BTU (th) (BTU)
0.5	0.500335
1	1.000669
2	2.001339
5	5.003347
10	10.006695
15	15.010042
20	20.013389
25	25.016737
50	50.033473
100	100.066947
250	250.167367
500	500.334734
1000	1,000.669467

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

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

How to Convert BTU (th) to BTU (IT)

To convert from BTU (th) (BTU) to BTU (IT) (BTU (IT)), multiply the value by 0.9993309808.

Formula: BTU (IT) = BTU × 0.9993309808

Reverse: BTU = BTU (IT) × 1.0006694671

Step-by-Step Example

Start with your value in BTU (th). For example: 5 BTU
Multiply by the conversion factor: 5 x 0.9993309808
The result is: 4.996655 BTU (IT)

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 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.

Frequently Asked Questions

How many BTU (IT) are in 1 BTU (th)?

There are exactly 0.9993309808 BTU (IT) in 1 BTU (th). This means the conversion factor from BTU (th) to BTU (IT) is 0.9993309808.

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

The formula to convert BTU (th) to BTU (IT) is: BTU (IT) = BTU × 0.9993309808. For example, to convert 10 BTU (th) to BTU (IT), you would multiply 10 by 0.9993309808.

What is a BTU (th)?