MJ to kWh Converter — Convert Megajoules to Kilowatt Hours for Gas Bills

Convert MJ to kWh as you type.

Energy Unit Converter - Instant & Accurate

1 MJ ≈ 0.2777777778 kWh

Reference for one unit; displayed values may be rounded.

Enter Megajoules

Megajoules

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

Result in Kilowatt Hours

kWh

Kilowatt Hours

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

MJ to kWh Conversion Formula

To convert megajoules to kilowatt hours, divide the MJ value by 3.6, or multiply by 0.277778. One megajoule is 1,000,000 joules while one kilowatt hour is 3,600,000 joules, so the exact ratio is 1 MJ = 1/3.6 kWh.

1 MJ ≈ 0.2777777778 kWh

Megajoules and Kilowatt Hours Explained

Megajoules (MJ)

The megajoule (MJ) is one million joules, the everyday scale of the SI energy unit. A ducted gas heater might burn 200 MJ on a cold winter's day, a litre of petrol holds about 34 MJ, and a sprinting cyclist delivers roughly 1 MJ per minute at peak. Australian gas retailers quote natural gas energy content in MJ per cubic metre, making the megajoule the working unit of the gas industry here.

Where it is used: Standard on every Australian and New Zealand gas bill, in gas heater and hot water system ratings, LPG bottle specifications, and food labels using the related kilojoule.

Origin: A straight metric multiple of the joule; Australian gas utilities adopted MJ billing at metrication in the 1970s, replacing the therm and cubic-foot charges inherited from imperial practice.

Kilowatt Hours (kWh)

The kilowatt hour (kWh) is the energy of one kilowatt of power — one thousand watts — sustained for one hour, equal to 3.6 MJ or 3,600,000 joules. It's what your electricity meter counts and your retailer bills: an average Australian home uses about 16-20 kWh per day, an EV battery holds 40-100 kWh, and a split-system air-con running through a 40°C summer day can easily draw 5-10 kWh.

Where it is used: Universal for electricity billing, EV and home battery specifications, solar output metering, and appliance energy ratings.

Origin: Created by early electrical utilities in the 1880s as a billable combination of power and time; despite not being an SI unit, it's legal for trade nearly everywhere, including Australia.

Megajoules to Kilowatt Hours Conversion Table

Select a value to use it in the calculator.

Megajoules (MJ)	Kilowatt Hours (kWh)
	0.2777777778 kWh
	0.5555555556 kWh
	1.3888888889 kWh
	2.7777777778 kWh
	5.5555555556 kWh
	13.8888888889 kWh
	27.7777777778 kWh
	41.6666666667 kWh
	55.5555555556 kWh
	69.4444444444 kWh
	111.1111111111 kWh
	138.8888888889 kWh
	277.7777777778 kWh

Kilowatt Hours to Megajoules Conversion Table

Kilowatt Hours (kWh)	Megajoules (MJ)
0.1 kWh	0.36 MJ
0.25 kWh	0.9 MJ
0.5 kWh	1.8 MJ
1 kWh	3.6 MJ
2 kWh	7.2 MJ
5 kWh	18 MJ
10 kWh	36 MJ
20 kWh	72 MJ
30 kWh	108 MJ
50 kWh	180 MJ
60 kWh	216 MJ
100 kWh	360 MJ

Megajoules to Kilowatt Hours in Everyday Objects

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

	Megajoules (MJ)	Kilowatt Hours (kWh)
A 1000 kJ chocolate bar	1.046 MJ	0.2905555556 kWh
A therm of natural gas (105.5 MJ)	105.506 MJ	29.3072222222 kWh
A winter's day of ducted gas heating in Melbourne	400 MJ	111.1111111111 kWh
A 60 kWh EV battery	216 MJ	60 kWh
A 9 kg LPG bottle for the barbie	414 MJ	115 kWh
A month of electricity for an average Aussie home	3240 MJ	900 kWh

When You Need Megajoules to Kilowatt Hours Conversions

Reading Your Gas Bill

A winter bill from your retailer showing 12,000 MJ of gas divides down to 3333.33 kWh. Priced against your electricity tariff, that instantly shows whether ducted gas heating still beats a reverse-cycle air conditioner.

Choosing a Hot Water System

Plumbers quote gas units in MJ/h and electric ones in kW. A 200 MJ/h continuous-flow model converts to 55.556 kWh of heating per hour — over fifteen times a standard 3.6 kW electric element, which is why gas hot water recovers so quickly.

Barbie and Patio Gas Planning

A 9 kg LPG bottle holds about 414 MJ of chemical energy, or 115 kWh. Converting bottle capacity this way tells you how many long barbie sessions one refill covers before the next swap-and-go.

Comparing Home Heating Fuels

Ducted gas heaters are rated in MJ/h while electric reverse-cycle systems quote kW. Converting a 400 MJ/h ducted system to 111.111 kWh/h puts both technologies on one scale for a like-for-like running-cost comparison — handy for Victorian winters.

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How to Use

1

Enter Megajoules

Type the MJ figure from your gas bill, hot water system label or heater spec — for example 400 MJ, a fair winter's day of gas ducted heating in Melbourne
2

View Kilowatt Hours

The electricity-scale equivalent appears instantly: 400 MJ converts to 111.111 kWh, ready to price against your electricity tariff in cents per kWh
3

Copy or Swap

Copy the result or click Swap to convert kilowatt hours back to megajoules for reverse checks
4

Price the Energy

Multiply the kWh result by your electricity rate to compare fuels: at 30c per kWh, that 400 MJ of gas (111.111 kWh) would cost $33.33 as electricity — often well above the gas charge on your bill

Why Use Be Converter?

Instant Conversion

Get precise MJ to kWh results in real-time as you type — ideal for decoding gas bills from Origin, AGL or EnergyAustralia and checking heater specs

Exact 1/3.6 Ratio

Uses the exact definition 1 kWh = 3.6 MJ, so 360 MJ always lands on exactly 100 kWh with no accumulated rounding

Conversion Table

Quick reference from 1 MJ (0.2778 kWh) through everyday bill amounts up to 1000 MJ (277.8 kWh), including the 105.5 MJ therm for overseas comparisons

Bidirectional

Easily swap between megajoules and kilowatt hours with one click to check both directions of a calculation

Free & No Sign-Up

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Frequently Asked Questions

How many kilowatt hours are in 1 megajoule?

1 megajoule equals 0.277778 kilowatt hours (exactly 1/3.6). Going the other way, 1 kWh equals 3.6 MJ. So 10 MJ of gas energy is about 2.78 kWh of electricity-equivalent — handy when comparing your gas bill with your electricity bill.

How do I convert 100 MJ to kWh?

Divide by 3.6: 100 ÷ 3.6 = 27.7778 kWh. This is a common gas-bill quantity — 100 MJ of natural gas contains the same energy as running a 2778 W bar heater for ten hours on a chilly night.

How many kWh is a therm of gas?

One therm equals 105.506 MJ, which converts to about 29.3 kWh. Therms appear on US and UK gas bills, so converting therm → MJ → kWh lets you line up overseas gas prices with your Australian electricity tariff.

Why does my Australian gas bill show MJ?

Australian gas retailers bill by megajoules because your meter measures volume, which the retailer multiplies by a heating value of roughly 38 MJ per cubic metre to give the energy used. To check the charge against electricity pricing, convert MJ to kWh by dividing by 3.6, then compare with your cents-per-kWh tariff.

How much gas does a hot water system use?

A gas storage hot water unit for a family of four typically burns 200-300 MJ per day, which is 55.6-83.3 kWh of energy. A 6-star continuous-flow system cuts that noticeably — one reason MJ-to-kWh comparisons matter when choosing between gas and a heat pump hot water system.

What is 1000 MJ in kilowatt hours?

1000 ÷ 3.6 = 277.778 kWh. That is roughly a month of water heating for a household, or about a fortnight of total electricity use for an average Australian home (around 16-20 kWh a day).

Is an MJ bigger than a kWh?

No — a kilowatt hour is 3.6 times larger than a megajoule. Converting MJ to kWh should always shrink the number: 500 MJ becomes 138.889 kWh. If your result grew, you multiplied by 3.6 instead of dividing.

How do I convert MJ to kWh in my head?

Use the approximation 1 MJ ≈ 0.28 kWh: 100 MJ ≈ 28 kWh, 400 MJ ≈ 112 kWh. The exact factor is 0.277778, so this shortcut stays within about 1% — good enough for checking a gas bill on the spot.

About Our Megajoules to Kilowatt Hours Converter

Our free online MJ to kWh converter gives instant, accurate energy conversions for Australian gas bills, hot water systems and home heating. Australia is one of the few countries that sells natural gas by the megajoule, while electricity is billed by the kilowatt hour — and since 1 MJ = 0.277778 kWh exactly, converting between them is the quickest way to see which fuel is cheaper for heating, hot water and the cooktop. Whether you're weighing ducted gas heating against reverse-cycle in a Melbourne winter, checking a quarterly bill from Origin or AGL, or comparing a continuous-flow hot water unit with an electric heat pump, this tool handles everything from a single MJ to a full quarter's gas usage with an exact definition-based factor.

Expert Tips for MJ to kWh Conversion

The exact ratio is 1 MJ = 1/3.6 kWh = 0.277778 kWh. Memorise two anchors: 90 MJ = 25 kWh and 360 MJ = 100 kWh, then interpolate for everything in between.

Checking a gas bill from AGL, Origin or EnergyAustralia: multiply the MJ usage by your rate in cents/MJ, then convert the same MJ to kWh (÷3.6) and price it at your electricity tariff — the gap is your potential saving from switching to reverse-cycle heating or a heat pump hot water system.

Overseas figures in therms convert through MJ: 1 therm = 105.506 MJ = 29.307 kWh. Chain the two steps when comparing American or British gas charges with local electric running costs.

Hot water shopping: a continuous-flow gas unit rated at 200 MJ/h delivers 55.6 kW of heating power, versus a typical 3.6 kW electric element — that's why gas units recover faster and why the MJ/h rating deserves a closer look.

For carbon accounting, converting your annual gas MJ into kWh (÷3.6) puts both fuels in one column; multiplying by a single grid-emissions factor then gives your household's total CO2 from gas and electricity — especially useful for solar households working out payback.

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