kWh to MJ Converter — Kilowatt Hours to Megajoules for Aussie Bills

Convert kWh to MJ as you type.

Energy Unit Converter - Instant & Accurate

1 kWh = 3.6 MJ

Reference for one unit; displayed values may be rounded.

Enter Kilowatt Hours

kWh

Kilowatt Hours

Use a dot or comma for decimals, without thousands separators.

Result in Megajoules

Megajoules

Decimal places

Display rounding does not improve the accuracy of your original measurement. Very large or very small results use scientific notation.

Method and source

kWh to MJ Conversion Formula

To convert kilowatt hours to megajoules, multiply the kWh value by 3.6. One kilowatt hour is 3,600,000 joules of electrical energy, and one megajoule is 1,000,000 joules, so the ratio is exactly 3.6 — no rounding involved. It is the same factor that connects the kWh on your power bill to the MJ on your gas bill.

1 kWh = 3.6 MJ

Kilowatt Hours and Megajoules Explained

Kilowatt Hours (kWh)

The kilowatt hour (kWh) is the commercial unit of electrical energy: the energy delivered by one kilowatt of power sustained for one hour. Physically it is 3.6 megajoules or 3,600,000 joules. Electricity meters across Australia count kWh, making it the unit households see on every power bill — a typical Australian home draws roughly 18 kWh a day, or about 6,500 kWh a year.

Where it is used: Universal in electricity billing, EV battery specifications, solar system sizing, and appliance energy labels.

Origin: Grew out of early utility metering in the 1880s, when power companies needed a billable quantity tied to watts and hours; it remains the billing standard despite the SI preferring joules.

Megajoules (MJ)

The megajoule (MJ) is one million joules, the SI-derived energy unit scaled for everyday quantities. One MJ runs a 1000 W microwave for about 17 minutes, and a litre of petrol contains roughly 34 MJ. Natural gas energy content is quoted in MJ per cubic metre, and food labels across Australia use the closely related kilojoule.

Where it is used: Standard on gas bills from retailers such as Origin, AGL and EnergyAustralia, in heating and fuel engineering, on food labels as kilojoules, and in scientific reporting.

Origin: A decimal multiple of the joule, formalized with SI prefixes; Australian gas retailers adopted MJ billing as metrication replaced the imperial therm and cubic-foot units.

Kilowatt Hours to Megajoules Conversion Table

Select a value to use it in the calculator.

Kilowatt Hours (kWh)	Megajoules (MJ)
	0.36 MJ
	0.9 MJ
	1.8 MJ
	3.6 MJ
	7.2 MJ
	18 MJ
	36 MJ
	54 MJ
	72 MJ
	108 MJ
	144 MJ
	180 MJ
	216 MJ
	360 MJ

Megajoules to Kilowatt Hours Conversion Table

Megajoules (MJ)	Kilowatt Hours (kWh)
1 MJ	0.2777777778 kWh
2 MJ	0.5555555556 kWh
5 MJ	1.3888888889 kWh
10 MJ	2.7777777778 kWh
20 MJ	5.5555555556 kWh
50 MJ	13.8888888889 kWh
100 MJ	27.7777777778 kWh
200 MJ	55.5555555556 kWh
400 MJ	111.1111111111 kWh
1000 MJ	277.7777777778 kWh

Kilowatt Hours to Megajoules in Everyday Objects

Common real-world examples that make Kilowatt Hours and Megajoules easy to picture at a glance.

	Kilowatt Hours (kWh)	Megajoules (MJ)
Charging a smartphone	0.015 kWh	0.054 MJ
A dishwasher cycle	1.2 kWh	4.32 MJ
A Tesla Powerwall 2 battery	13.5 kWh	48.6 MJ
A day of Australian home electricity	30 kWh	108 MJ
A 60 kWh EV battery	60 kWh	216 MJ
A month of Australian home electricity	900 kWh	3240 MJ

When You Need Kilowatt Hours to Megajoules Conversions

Comparing Gas and Electricity Bills

Australian energy retailers bill gas in MJ and electricity in kWh. Converting a 90 kWh monthly electric charge to 324 MJ lets you stack both fuel costs on one spreadsheet when comparing plans or switching providers.

EV Battery Spec Sheet Translation

Automakers quote pack sizes in kWh, but energy-density research papers use MJ. A 75 kWh long-range pack becomes 270 MJ — directly comparable with the roughly 34 MJ in a litre of petrol.

Home Battery and Solar Quotes

Solar installers mix units across quotes. Converting a quoted 13.5 kWh Powerwall to 48.6 MJ and a 10.5 kWh retrofit to 37.8 MJ makes storage options easy to rank against a typical Aussie household's daily demand of about 65 MJ.

Building Energy Audits

Auditors roll electricity (kWh) and natural gas (MJ) into one annual MJ figure. A commercial building using 60,000 kWh of electricity a year reports 216,000 MJ for NABERS ratings, carbon accounting and compliance filings.

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How to Use

1

Enter Kilowatt Hours

Type the kWh value from your electricity bill, appliance label or EV spec sheet — for example 30 kWh, the sort of daily figure a big Queensland household clocks up during aircon season
2

View Megajoules

The SI equivalent appears instantly: 30 kWh converts to 108 MJ, ready to compare with the MJ figures on your gas bill and fuel energy content
3

Copy or Swap

Copy the result or click Swap to convert megajoules back to kilowatt hours for two-way energy comparisons
4

Compare Across Fuels

Put the result next to other energy figures: a 60 kWh EV battery (216 MJ) holds roughly the same energy as six litres of petrol at about 34 MJ a litre — though the electric motor turns far more of it into kilometres driven

Why Use Be Converter?

Instant Conversion

Get precise kWh to MJ results in real time as you type — ideal for comparing an Origin electricity bill with an AGL gas bill or checking appliance specs

Exact 3.6 Factor

Because 1 kWh = 3.6 MJ by definition, values like 10 kWh always convert to exactly 36 MJ with zero rounding error

Conversion Table

Quick reference covering home-scale values — 1 kWh (3.6 MJ), an 18 kWh day of typical Aussie household use (64.8 MJ), and a 60 kWh EV battery (216 MJ)

Bidirectional

Easily swap between kilowatt hours and megajoules with one click for reverse conversions when your gas retailer bills in MJ and you think in kWh

Free & No Signup

No registration required. Unlimited conversions. Completely free forever

Privacy First

All calculations happen in your browser. No data is sent to any server

Frequently Asked Questions

How many megajoules are in 1 kilowatt hour?

1 kilowatt hour equals exactly 3.6 megajoules. A 1 kW bar heater running for one hour uses 3,600,000 J, which is 3.6 MJ. In reverse, 1 MJ equals about 0.278 kWh.

How do I convert 100 kWh to MJ?

Multiply by 3.6: 100 × 3.6 = 360 MJ. That is roughly the usable battery capacity of a long-range electric car sold in Australia such as a Tesla Model S or a Mercedes EQS.

Why do gas bills use MJ while electric bills use kWh?

Electricity meters record energy in kilowatt hours by tradition, while Australian gas retailers bill in megajoules because gas energy content is measured in MJ per cubic metre. To compare a gas charge with an electric charge, convert: 100 MJ of gas equals about 27.8 kWh.

Is kWh an SI unit?

No. The SI unit of energy is the joule; kilowatt hour is a composite of non-SI hour and SI watt, accepted for billing convenience. 1 kWh = 3.6 MJ = 3,600,000 J exactly, so conversion is a clean decimal shift.

How many MJ does a house use per day?

The average Australian home uses about 18 kWh of electricity a day, which is roughly 65 MJ — though Brisbane homes running aircon through summer can top 25 kWh (90 MJ). Add winter gas heating in Melbourne or Hobart at 50-100 MJ a day and total household energy can climb past 150 MJ daily.

How many megajoules is a 60 kWh EV battery?

60 kWh × 3.6 = 216 MJ. For context, a litre of petrol holds about 34 MJ, so a 60 kWh battery stores energy comparable to roughly six litres of petrol — illustrating why the efficiency of electric motors matters so much for range.

What is 10.5 kWh in MJ?

10.5 × 3.6 = 37.8 MJ. This is a common home battery size — the Tesla Powerwall 2, a favourite in Australian solar installs, holds 13.5 kWh, which equals 48.6 MJ.

Which is bigger, a kWh or an MJ?

A kilowatt hour is bigger: 1 kWh = 3.6 MJ. So converting kWh to MJ should always produce a larger number — if your MJ result is smaller than the kWh input, you divided instead of multiplied.

About Kilowatt Hours to Megajoules Converter

Our free online kilowatt hours to megajoules converter provides instant, accurate energy conversions for utility bills, electric vehicles and home energy audits. The kilowatt hour is the commercial unit of electrical energy — the quantity your meter records and your electricity retailer charges for. The megajoule is the unit Australian gas retailers bill in, the kilojoule on every food label is its close cousin, and engineers use it throughout the industry. Because 1 kWh = 3.6 MJ exactly, moving between electricity figures and gas or fuel figures takes one multiplication. Whether you are comparing heating options before a cold Melbourne winter, sizing a home battery for your solar system, or checking an EV spec sheet against petrol's energy content, this tool keeps every figure on one consistent scale.

Expert Tips for kWh to MJ Conversion

The factor 3.6 is exact: 1 kW for 3600 seconds is 3,600,000 J. Use it at full precision — 250 kWh is exactly 900 MJ, no significant figures to worry about.

Australian gas retailers charge per MJ while electricity is billed in kWh. To compare costs fairly, convert 1 MJ = 0.277778 kWh first, then work out each tariff on the same per-kWh basis.

Home battery quick reference: Tesla Powerwall 2 = 13.5 kWh = 48.6 MJ; a typical 10.5 kWh retrofit unit = 37.8 MJ. Solar installers across Australia often quote both figures.

For EV shopping, translate battery kWh to MJ (× 3.6) to compare with fuel energy: a litre of petrol holds about 34 MJ, so a 75 kWh (270 MJ) pack carries energy equal to roughly 8 litres of petrol.

Energy auditors: Australian gas bills are already in MJ, so pair them with converted electricity figures. A household using 5,000 kWh of power plus 20,000 MJ of gas a year lands on a single 38,000 MJ column — perfect for annual reporting.

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