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    Energy Conversion

    80 BTU (th) to Kilojoule

    Quick answer

    80 BTU (th) (BTU) equals

    84.348 kJ

    To convert 80 BTU (th)s to Kilojoules, multiply by 1.05435. Therefore, 80 BTU (th) (BTU) equals 84.348 Kilojoule (kJ).

    Formula: kJ = BTU × 1.05435. Calculation: 80 × 1.05435 = 84.348 kJ.

    Convert BTU (th) (BTU) to Kilojoule (kJ) online with our free unit converter. In energy, 1 BTU = 1.05435 kJ. Explore step-by-step conversion steps, mathematical formulas, and quick conversion reference tables below.

    Worked example: converting BTU (th) to Kilojoule

    1. Step 1 — start with the formula. kJ = BTU × 1.05435
    2. Step 2 — substitute your figure. 80 BTU × 1.05435
    3. Step 3 — read the result. 80 BTU = 84.348 kJ
    4. Step 4 — check it in reverse. BTU = kJ × 0.9484516527 returns 80 BTU, which matches the figure you started with.

    Energy Converter

    27 units available

    Decimals:
    84.348

    80 BTU = 84.348 kJ

    Formula:

    kJ = BTU × 1.05435

    With your value: 80 BTU = 84.348 kJ

    How big is that?

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

    Heartbeat (1/8.4e+4 your value)0.000948 BTU
    AA battery charge (1/8.4 your value)9.48 BTU
    Your value80.0 BTU
    Slice of bread (3.3× your value)266 BTU
    Daily food intake (1.0e+2× your value)7.97e+3 BTU
    Litre of petrol (4.1e+2× your value)3.24e+4 BTU

    Other BTU (th) to Kilojoule conversions

    65 BTU to kJ70 BTU to kJ72 BTU to kJ75 BTU to kJ85 BTU to kJ90 BTU to kJ96 BTU to kJFull BTU (th) to Kilojoule converter

    BTU (th) to Kilojoule Conversion Table

    BTU (th) (BTU)Kilojoule (kJ)
    0.50.527175
    11.05435
    22.1087
    55.27175
    1010.5435
    1515.81525
    2021.087
    2526.35875
    5052.7175
    100105.435
    250263.5875
    500527.175
    10001,054.35

    Kilojoule to BTU (th) Conversion Table

    Kilojoule (kJ)BTU (th) (BTU)
    0.50.474226
    10.948452
    21.896903
    54.742258
    109.484517
    1514.226775
    2018.969033
    2523.711291
    5047.422583
    10094.845165
    250237.112913
    500474.225826
    1000948.451653

    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

    Kilojoule (kJ)

    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 Kilojoule

    To convert from BTU (th) (BTU) to Kilojoule (kJ), multiply the value by 1.05435.

    Formula: kJ = BTU × 1.05435

    Reverse: BTU = kJ × 0.9484516527

    Step-by-Step Example

    1. Start with your value in BTU (th). For example: 5 BTU
    2. Multiply by the conversion factor: 5 x 1.05435
    3. The result is: 5.27175 kJ

    BTU (th) and Kilojoule Relationship

    This conversion bridges the US Customary / Imperial and Metric (SI) measurement systems, commonly required when translating scientific data, international engineering specifications, or trade standards. Since 1 BTU (th) equals approximately 1.0544 Kilojoules, the BTU (th) represents a larger unit interval than the Kilojoule. Understanding the relationship between BTU (th) and Kilojoule is essential for accurate calculations in physics, engineering, commerce, and daily applications.

    About BTU (th)

    The BTU (th) (symbol: BTU) is a recognized unit in the US Customary / Imperial measurement framework, utilized within energy applications for precision and standardized data representation.

    Common uses of BTU (th): energy calculations, engineering and science, education.

    About Kilojoule

    The Kilojoule (symbol: kJ) is a recognized unit in the Metric (SI) measurement framework, utilized within energy applications for precision and standardized data representation.

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

    Frequently Asked Questions

    What is 80 BTU (th) in Kilojoule?
    80 BTU (th) equals 84.348 Kilojoule.
    How many Kilojoules are in 1 BTU (th)?
    There are exactly 1.05435 Kilojoules in 1 BTU (th). This means the conversion factor from BTU (th) to Kilojoule is 1.05435.
    What is the formula to convert BTU (th) to Kilojoule?
    The formula to convert BTU (th) to Kilojoule is: kJ = BTU × 1.05435. For example, to convert 10 BTU (th)s to Kilojoules, you would multiply 10 by 1.05435.
    What is a BTU (th)?
    The BTU (th) (symbol: BTU) is a recognized unit in the US Customary / Imperial measurement framework, utilized within energy applications for precision and standardized data representation.
    What is a Kilojoule?
    The Kilojoule (symbol: kJ) is a recognized unit in the Metric (SI) measurement framework, utilized within energy applications for precision and standardized data representation.
    What are the common uses of BTU (th)?
    The BTU (th) is commonly used in energy calculations, engineering and science, education.

    Related Energy Conversions

    Joule → KilojouleMegajoule → KilojouleGigajoule → KilojouleMillijoule → KilojouleCalorie (th) → KilojouleCalorie (IT) → KilojouleKilocalorie → KilojouleBTU (th) → JouleBTU (th) → Megajoule

    Cite this page

    UnitConvertLab. (2026). 80 BTU (th) to Kilojoule. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/80-btu-to-kilojoule