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Milliwatt-hours to Gigajoules conversion

Milliwatt-hours to Gigajoules conversion table

Milliwatt-hours (mWh)Gigajoules (GJ)
00
13.6e-9
27.2e-9
31.08e-8
41.44e-8
51.8e-8
62.16e-8
72.52e-8
82.88e-8
93.24e-8
103.6e-8
207.2e-8
301.08e-7
401.44e-7
501.8e-7
602.16e-7
702.52e-7
802.88e-7
903.24e-7
1003.6e-7
10000.0000036

How to convert milliwatt-hours to gigajoules?

To convert milliwatt-hours (mWh) to gigajoules (GJ), we need to understand the relationship between these units of energy. Here's the step-by-step conversion:

  1. Convert milliwatt-hours to watt-hours (Wh): Since 1 milliwatt (mW) is equal to 0.001 watts (W), 1 milliwatt-hour (mWh) is equal to 0.001 watt-hours (Wh).

    Therefore, 1 mWh=0.001 Wh 1 \text{ mWh} = 0.001 \text{ Wh}

  2. Convert watt-hours to joules (J): One watt-hour is equivalent to 3600 joules, since: 1 Wh=1 W×3600 seconds=3600 J 1 \text{ Wh} = 1 \text{ W} \times 3600 \text{ seconds} = 3600 \text{ J}

    So, 0.001 Wh=0.001×3600 J=3.6 J 0.001 \text{ Wh} = 0.001 \times 3600 \text{ J} = 3.6 \text{ J}

  3. Convert joules to gigajoules (GJ): There are 10910^9 joules in a gigajoule.

    Therefore, 3.6 J=3.6×10−9 GJ=3.6×10−9 GJ 3.6 \text{ J} = 3.6 \times 10^{-9} \text{ GJ} = 3.6 \times 10^{-9} \text{ GJ}

Hence, 1 milliwatt-hour (mWh) is equal to 3.6×10−93.6 \times 10^{-9} gigajoules (GJ).

Real World Examples of Milliwatt-Hours:

  1. Energy consumed by a LED light:

    • A small LED light consumes about 20 milliwatts (mW). If it runs for an hour, it uses 20 milliwatt-hours (mWh).

    • Calculation: 20 mWh=20×3.6×10−9 GJ=72×10−9 GJ=7.2×10−8 GJ 20 \text{ mWh} = 20 \times 3.6 \times 10^{-9} \text{ GJ} = 72 \times 10^{-9} \text{ GJ} = 7.2 \times 10^{-8} \text{ GJ}

  2. Energy stored in a coin cell battery:

    • A typical CR2032 coin cell battery has a capacity of about 240 milliamp-hours (mAh) at 3 volts. This translates to an energy storage of:

      240 mAh×3 V=720 mWh 240 \text{ mAh} \times 3 \text{ V} = 720 \text{ mWh}

    • Calculation: 720 mWh=720×3.6×10−9 GJ=2592×10−9 GJ=2.592×10−6 GJ 720 \text{ mWh} = 720 \times 3.6 \times 10^{-9} \text{ GJ} = 2592 \times 10^{-9} \text{ GJ} = 2.592 \times 10^{-6} \text{ GJ}

  3. Energy usage of a smartwatch:

    • A smartwatch might consume around 500 milliwatt-hours (depending on usage) over the course of a day.

    • Calculation: 500 mWh=500×3.6×10−9 GJ=1800×10−9 GJ=1.8×10−6 GJ 500 \text{ mWh} = 500 \times 3.6 \times 10^{-9} \text{ GJ} = 1800 \times 10^{-9} \text{ GJ} = 1.8 \times 10^{-6} \text{ GJ}

In the real world, milliwatt-hours are typically used to describe small amounts of energy consumption or storage, such as that used by small electronic devices, batteries, and various low-power technologies.

See below section for step by step unit conversion with formulas and explanations. Please refer to the table below for a list of all the Gigajoules to other unit conversions.

What is milliwatt-hours?

A Milliwatt-hour is a unit of energy and its units, kWh, are formed with W for watt and h for hour from SI unit system combined with letter m, metric prefix, for 0.001 or 10−310^{-3}. Its definition, in the context of electricity, is the energy of one watt power flowing for one hour.

Followings equivalent equations are identical but in different units. Please note that factor 10−310^{-3} is representing Milli prefix in mWh unit.

1mWh=10−3∗Pt=10−3∗IVt=3600∗10−3∗J=2.247∗1022∗10−3eV=8.598∗105∗10−3cal1 mWh = 10^{-3}*Pt = 10^{-3}*IVt = 3600 * 10^{-3}*J = 2.247 * 10^{22} * 10^{-3} eV = 8.598*10^5 * 10^{-3} cal

P−PowerP - Power
t−Time (in hours. Multiply by 3600 to convert to seconds)t - Time \text{ (in hours. Multiply by 3600 to convert to seconds)}
I−CurrentI - Current V−VoltsV - Volts
J−JoulesJ - Joules
eV−ElectronvolteV - Electronvolt
cal−Caloriescal - Calories

Wikipedia page for Kilowatt-hour (watt-hour redirected to kWh) UCI article on Energy Units and Conversions Ian Woofenden's explanation on difference between Watts and Watt-Hours

What is gigajoules?

A gigajoule (GJ) is a unit of energy, specifically a large unit of measurement for electrical and thermal energy.

One gigajoule is equal to one billion joules. To put that in perspective:

  • 1 joule is the amount of energy required to lift an object weighing about 2 pounds up 3 feet.
  • 1 megajoule (MJ) is equal to 1 million joules, which is a significant amount of energy but still relatively small compared to what we use on a daily basis.
  • 1 gigajoule (GJ), on the other hand, is equivalent to:
    • About 277.8 kilowatt-hours (kWh) or 0.2778 megawatt-hours (MWh).
    • The energy produced by burning about 200 kilograms (440 pounds) of gasoline.
    • Enough electricity to power a typical household for about 24 hours.

Gigajoules are often used in the context of:

  • Energy production and consumption (e.g., electrical power plants, oil refineries)
  • Thermal energy storage (e.g., large-scale heat pumps, industrial processes)
  • Renewable energy sources (e.g., solar panels, wind turbines)

I hope that helps you understand gigajoules better!

Complete Milliwatt-hours conversion table

Enter # of Milliwatt-hours
Convert 1 mWh to other unitsResult
Milliwatt-hours to Watt-seconds (mWh to Ws)3.6
Milliwatt-hours to Watt-minutes (mWh to Wm)0.06
Milliwatt-hours to Watt-hours (mWh to Wh)0.001
Milliwatt-hours to Kilowatt-hours (mWh to kWh)0.000001
Milliwatt-hours to Megawatt-hours (mWh to MWh)1e-9
Milliwatt-hours to Gigawatt-hours (mWh to GWh)1e-12
Milliwatt-hours to Joules (mWh to J)3.6
Milliwatt-hours to Kilojoules (mWh to kJ)0.0036
Milliwatt-hours to Megajoules (mWh to MJ)0.0000036
Milliwatt-hours to Gigajoules (mWh to GJ)3.6e-9
Milliwatt-hours to calories (mWh to cal)0.8604206500956
Milliwatt-hours to Kilocalories (mWh to kcal)0.0008604206500956

Energy conversions