Skip to main content
    UnitConvertLab
    UnitConvertLAB
    Energy Conversion

    20 Kilowatt-Hour to Gigajoule

    Quick answer

    20 Kilowatt-Hour (kWh) equals

    0.072 GJ

    To convert 20 Kilowatt-Hours to Gigajoules, multiply by 0.0036. Therefore, 20 Kilowatt-Hour (kWh) equals 0.072 Gigajoule (GJ).

    Formula: GJ = kWh × 0.0036. Calculation: 20 × 0.0036 = 0.072 GJ.

    Convert Kilowatt-Hour (kWh) to Gigajoule (GJ) online with our free unit converter. In energy, 1 kWh = 0.0036 GJ. Explore step-by-step conversion steps, mathematical formulas, and quick conversion reference tables below.

    Worked example: converting Kilowatt-Hour to Gigajoule

    1. Step 1 — start with the formula. GJ = kWh × 0.0036
    2. Step 2 — substitute your figure. 20 kWh × 0.0036
    3. Step 3 — read the result. 20 kWh = 0.072 GJ
    4. Step 4 — check it in reverse. kWh = GJ × 277.7777777778 returns 20 kWh, which matches the figure you started with.

    Energy Converter

    27 units available

    Decimals:
    0.072

    20 kWh = 0.072 GJ

    Formula:

    GJ = kWh × 0.0036

    With your value: 20 kWh = 0.072 GJ

    How big is that?

    Everyday references on a logarithmic scale, all expressed in kilowatt-hour so you can sanity-check the result.

    Heartbeat (1/7.2e+7 your value)2.78e-7 kWh
    AA battery charge (1/7.2e+3 your value)0.00278 kWh
    Slice of bread (1/2.6e+2 your value)0.0778 kWh
    Daily food intake (1/8.6 your value)2.33 kWh
    Litre of petrol (1/2.1 your value)9.50 kWh
    Your value20.0 kWh

    Other Kilowatt-Hour to Gigajoule conversions

    14 kWh to GJ15 kWh to GJ16 kWh to GJ18 kWh to GJ21 kWh to GJ24 kWh to GJ25 kWh to GJFull Kilowatt-Hour to Gigajoule converter

    Kilowatt-Hour to Gigajoule Conversion Table

    Kilowatt-Hour (kWh)Gigajoule (GJ)
    0.50.0018
    10.0036
    20.0072
    50.018
    100.036
    150.054
    200.072
    250.09
    500.18
    1000.36
    2500.9
    5001.8
    10003.6

    Gigajoule to Kilowatt-Hour Conversion Table

    Gigajoule (GJ)Kilowatt-Hour (kWh)
    0.5138.888889
    1277.777778
    2555.555556
    51,388.888889
    102,777.777778
    154,166.666667
    205,555.555556
    256,944.444444
    5013,888.888889
    10027,777.777778
    25069,444.444444
    500138,888.888889
    1000277,777.777778

    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.

    Kilowatt-Hour (kWh)

    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

    Gigajoule (GJ)

    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 Kilowatt-Hour to Gigajoule

    To convert from Kilowatt-Hour (kWh) to Gigajoule (GJ), multiply the value by 0.0036.

    Formula: GJ = kWh × 0.0036

    Reverse: kWh = GJ × 277.7777777778

    Step-by-Step Example

    1. Start with your value in Kilowatt-Hour. For example: 5 kWh
    2. Multiply by the conversion factor: 5 x 0.0036
    3. The result is: 0.018 GJ

    Kilowatt-Hour and Gigajoule Relationship

    Both Kilowatt-Hour and Gigajoule belong to the Metric (SI) system, making this an intra-system conversion within energy. Since 1 Kilowatt-Hour represents a fraction of a Gigajoule (1 Gigajoule ≈ 277.7778 Kilowatt-Hours), the Gigajoule is the larger measurement interval. Understanding the relationship between Kilowatt-Hour and Gigajoule is essential for accurate calculations in physics, engineering, commerce, and daily applications.

    About Kilowatt-Hour

    The kilowatt-hour is a unit of energy equal to 3.6 million joules, commonly used for electrical billing.

    Common uses of Kilowatt-Hour: electricity bills, energy consumption, appliances.

    About Gigajoule

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

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

    Frequently Asked Questions

    What is 20 Kilowatt-Hour in Gigajoule?
    20 Kilowatt-Hour equals 0.072 Gigajoule.
    How many Gigajoules are in 1 Kilowatt-Hour?
    There are exactly 0.0036 Gigajoules in 1 Kilowatt-Hour. This means the conversion factor from Kilowatt-Hour to Gigajoule is 0.0036.
    What is the formula to convert Kilowatt-Hour to Gigajoule?
    The formula to convert Kilowatt-Hour to Gigajoule is: GJ = kWh × 0.0036. For example, to convert 10 Kilowatt-Hours to Gigajoules, you would multiply 10 by 0.0036.
    What is a Kilowatt-Hour?
    The kilowatt-hour is a unit of energy equal to 3.6 million joules, commonly used for electrical billing.
    What is a Gigajoule?
    The Gigajoule (symbol: GJ) 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 Kilowatt-Hour?
    The Kilowatt-Hour is commonly used in electricity bills, energy consumption, appliances.

    Related Energy Conversions

    Joule → GigajouleKilojoule → GigajouleMegajoule → GigajouleMillijoule → GigajouleCalorie (th) → GigajouleCalorie (IT) → GigajouleKilocalorie → GigajouleBTU (th) → GigajouleBTU (IT) → Gigajoule

    Cite this page

    UnitConvertLab. (2026). 20 Kilowatt-Hour to Gigajoule. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/20-kilowatt_hour-to-gigajoule