BTU to kWh Converter for Australian Air Conditioners & Heaters

Convert btu to kWh as you type.

Energy Unit Converter - Instant & Accurate

1 btu ≈ 0.0002930722 kWh

Reference for one unit; displayed values may be rounded.

Enter BTU

btu

BTU

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

BTU to kWh Conversion Formula

To convert BTU to kilowatt hours, multiply the BTU value by 2.93072e-4 (0.000293072). One BTU equals 1055.06 joules and one kilowatt hour equals 3,600,000 joules, so the ratio works out to about 0.000293072 — or 3412.13 BTU per kWh in reverse. Handy for Australian gas bills too: 1 MJ equals 947.8 BTU.

1 btu ≈ 0.0002930722 kWh

BTU and Kilowatt Hours Explained

BTU (btu)

The British Thermal Unit (BTU) is the imperial heat unit: the energy to raise one pound (454 g) of water by 1°F (about 0.56°C), equal to 1055.06 joules. Imported and portable air conditioners are rated in BTU per hour — portable units span roughly 8,000 to 14,000 BTU/h and gas ducted heaters 40,000 to 120,000 BTU/h — while Australian gas bills arrive in megajoules (1 MJ = 947.8 BTU). One BTU is roughly the heat of a burning wooden match.

Where it is used: Standard in American heating and cooling equipment and on imported units sold in Australia — portable aircons, pool heaters, gas BBQs and LPG fuel data — as well as international LNG trading, where Australia is a major exporter.

Origin: Descends from 19th-century British steam engineering; the International Table definition fixing it at 1055.06 J was standardised in the 1950s as imperial and metric systems needed a firm bridge.

Kilowatt Hours (kWh)

The kilowatt hour (kWh) is the billing unit of electricity: one kilowatt sustained for one hour, equal to 3,600,000 joules or 3412.13 BTU. Households consume it daily — an Australian home averages about 16 kWh per day — and every electric meter counts it. It's also how Australia rates air conditioner output: a 3.5 kW split system is roughly 12,000 BTU. For heating comparisons, the kWh is the common denominator that lets reverse-cycle air conditioners, panel heaters and gas ducted heaters (converted from BTU) compete on one price sheet.

Where it is used: Universal in electricity billing, EV and battery specifications, appliance energy labels, the Zoned Energy Rating Label (ZERL) on air conditioners, and any cost comparison involving electric equipment.

Origin: Created by electric utilities in the 1880s as a natural billing unit of power multiplied by time; accepted for trade worldwide despite the SI system preferring joules.

BTU to Kilowatt Hours Conversion Table

Select a value to use it in the calculator.

BTU (btu)	Kilowatt Hours (kWh)
	0.0002930722 kWh
	0.0029307222 kWh
	0.0293072222 kWh
	0.1465361111 kWh
	0.2930722222 kWh
	1.4653611111 kWh
	2.63765 kWh
	3.5168666667 kWh
	5.2753 kWh
	7.0337333333 kWh
	10.5506 kWh
	17.5843333333 kWh
	26.8161083333 kWh
	29.3072222222 kWh

Kilowatt Hours to BTU Conversion Table

Kilowatt Hours (kWh)	BTU (btu)
0.001 kWh	3.4121282202 btu
0.01 kWh	34.121282202 btu
0.1 kWh	341.2128220196 btu
0.25 kWh	853.032055049 btu
0.5 kWh	1706.064110098 btu
1 kWh	3412.128220196 btu
2 kWh	6824.256440392 btu
3.5 kWh	11942.448770686 btu
5 kWh	17060.64110098 btu
10 kWh	34121.2822019601 btu
30 kWh	102363.8466058802 btu
100 kWh	341212.8220196008 btu

BTU to Kilowatt Hours in Everyday Objects

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

	BTU (btu)	Kilowatt Hours (kWh)
A wooden match burning	1 btu	0.0002930722 kWh
A bedroom split system, one hour	12000 btu	3.5168666667 kWh
A ducted air conditioner, one hour	36000 btu	10.5506 kWh
A gas ducted heater, one hour	60000 btu	17.5843333333 kWh
A megajoule of natural gas	100000 btu	29.3072222222 kWh
A kilo of LPG	91500 btu	26.8161083333 kWh

When You Need BTU to Kilowatt Hours Conversions

Portable Aircon Running Costs

A bedroom unit rated 8,000 BTU/h moves 2.34458 kWh of heat per hour. Multiplying by your electricity rate — roughly 35 cents per kWh in most capital cities — turns the sticker on the box into a real monthly bill estimate before you buy.

Ducted Gas Heating Versus Reverse-Cycle

Convert the heater output first: an 80,000 BTU/h model delivers 23.4458 kWh of heat hourly. Comparing gas cost per megajoule against electricity per kWh reveals which system heats cheaper — a decision Melburnians weigh up every winter.

Imported Equipment and Pool Heater Specs

Importer spec sheets state capacities in BTU/h while Australian compliance and billing work runs on kWh. Converting a pool heater's 150,000 BTU/h rating to 43.9608 kWh of heat keeps compliance spreadsheets internally consistent.

Generator and Heatwave Backup Planning

Standby generators are sized in kW while aircon loads appear in BTU/h. Converting a 48,000 BTU/h air conditioner (14.0675 kWh per hour) into kW draw confirms whether a 20 kW generator carries a 40°C summer peak.

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How to Use

1

Enter BTU

Type the BTU value from an appliance rating or spec sheet — common entries include 12,000 for a portable aircon and 40,000 for a gas ducted heater burner
2

View Kilowatt Hours

The electricity-scale equivalent appears instantly: 36,000 BTU (a 10.5 kW ducted system hour) converts to 10.5506 kWh, ready to price at your electricity rate
3

Copy or Swap

Copy the result or click Swap to convert kilowatt hours back to BTU for reverse checks on imported equipment specs
4

Estimate the Running Cost

Multiply the kWh by your rate: at 35 cents per kWh, that 36,000 BTU hour of cooling costs about $3.69 in electricity (before the 3-4× efficiency bonus of a genuine reverse-cycle system)

Why Use Be Converter?

Instant Conversion

Get precise BTU to kWh results in real-time as you type — ideal for translating imported split system specs and comparing gas ducted heating with reverse-cycle options

Exact Definition-Based Factor

Chains the exact definitions 1 BTU = 1055.06 J and 1 kWh = 3.6 MJ, so 341,213 BTU always lands on almost exactly 100 kWh — no rounding surprises on spec sheets

Conversion Table

Quick reference across common heating and cooling scales — a 12,000 BTU portable aircon hour (3.51687 kWh), a 60,000 BTU gas heater hour (17.5843 kWh), and a 100,000 BTU heater input (29.3072 kWh, about 105.5 MJ)

Bidirectional

Easily swap between BTU and kilowatt hours with one click to price gas ducted heating against reverse-cycle alternatives

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Frequently Asked Questions

How many kWh are in 1 BTU?

1 BTU equals 2.93072e-4 kWh — about 0.000293 kWh. The more useful direction for heating and cooling work is the reverse: 1 kWh = 3412.13 BTU, since imported aircon ratings cluster in the thousands of BTU.

How many kWh is a 12,000 BTU air conditioner?

12,000 BTU × 2.93072e-4 = 3.51687 kWh of cooling per hour — roughly a 3.5 kW split system. That figure is heat moved, not electricity drawn — a modern unit running at around 12 EER uses only about 1 kWh of electricity to do it.

How do I convert 100,000 BTU to kWh?

Multiply by 2.93072e-4: 100,000 × 0.000293072 = 29.3072 kWh. A hundred thousand BTU is about 105.5 megajoules — and the megajoule (MJ) is exactly what Australian natural gas bills use — so it's just over 29 kWh of heat.

How many BTU is 1 kilowatt hour?

1 kWh equals 3412.13 BTU. This is the figure to reach for on imported heater spec sheets and Zoned Energy Rating Label paperwork — an electric resistance heater drawing 1 kWh always releases 3412.13 BTU of heat.

Why do reverse-cycle air conditioners list both BTU and kWh?

BTU describes heat delivered (a 36,000 BTU/h unit moves 10.5506 kWh of heat per hour) while kWh describes electricity purchased. Their ratio is the efficiency: moving 36,000 BTU on 3 kWh of input means the system delivers 3.5 units of heat per unit of electricity.

How many kWh is a gas ducted heater hour?

A typical 60,000 BTU/h gas heater converts to 60,000 × 2.93072e-4 = 17.5843 kWh of heat per hour — about 63.3 MJ of gas. At 80% efficiency, around 14.0675 kWh actually reaches the ducts.

Is a BTU cheaper than a kWh?

As energy chunks, 3412.13 BTU equal 1 kWh, so a single BTU is a sliver of energy. Cost depends on fuel: Australian natural gas is billed in megajoules, and at typical prices — roughly 3-4 cents per MJ against 30-40 cents per kWh of electricity — 105.5 MJ of gas (29.3072 kWh of heat) usually costs less than equivalent electric heating, which is why gas heat comes in cheaper per unit of heat in most markets.

How do I size an air conditioner using kWh?

Rule-of-thumb cooling loads run about 1 kW per 10 square metres: a 150 m² Sydney home needs around 15 kW of cooling — roughly 51,200 BTU, or 15 kWh of cooling per hour. Divide by a seasonal efficiency of 3-4 to get expected electricity draw in kWh.

About Our BTU to Kilowatt Hours Converter

Our free online BTU to kilowatt hours converter provides instant, accurate energy conversions for sizing air conditioning, comparing heating options, and decoding power bills. Air conditioners sold in Australia are rated in kilowatts of cooling output, but imported units, portable aircons and American spec sheets still speak BTU per hour — while electricity is billed in kilowatt hours and gas arrives in megajoules. Using the exact chain 1 BTU = 1055.06 J and 1 kWh = 3,600,000 J, this tool converts BTU to kWh (factor 2.93072e-4) or back (1 kWh = 3412.13 BTU) so you can price a gas ducted heater hour against a reverse-cycle system, sanity-check an imported rating, or translate a gas bill in megajoules into electricity terms.

Expert Tips for BTU to kWh Conversion

Memorise one number: 1 kWh = 3412.13 BTU. Everything else follows — 10 kWh = 34,121.3 BTU, 1 million BTU = 293.072 kWh, and 1 MJ of gas = 947.8 BTU for reading your gas bill.

Sizing shortcuts: a 3.5 kW split system ≈ 12,000 BTU/h = 3.51687 kWh of hourly cooling, a 7.0 kW unit ≈ 24,000 BTU/h = 7.03373 kWh, and a 10.5 kW ducted system ≈ 36,000 BTU/h = 10.5506 kWh.

Gas bill translation: each megajoule (MJ) on your bill equals 947.8 BTU, or 0.27778 kWh of heat. If gas costs less per MJ than 0.28 times your electricity rate per kWh, gas heating wins on raw energy price.

Reverse-cycle shopping: convert the rated heating output in BTU/h to kWh (× 2.93072e-4), then divide by the rated electrical input in kW to get the COP. A 36,000 BTU/h unit drawing 3 kW delivers 10.5506 ÷ 3 ≈ COP 3.5 — the sort of number behind the Zoned Energy Rating Label.

Winter energy audits: a Melbourne home burning through 80 million BTU of heating per year is using about 23,445.8 kWh of heat. Comparing that with your actual electricity or gas billing reveals system efficiency losses immediately.

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