The deeper dives behind the calculators: state-by-state comparisons, the "is it cheaper to…" questions actually answered, and the maths behind each running-cost figure. Every number here uses the same registry and reference-rate data as the calculator it sits under.
No, not for most Australian homes: the state-by-state numbers for running a 5kW split system all day versus 6 hours, and when leaving it on actually pays off.
Read the guideA split system costs less to run than a portable of the same cooling size, and it isn't close. Registry-sourced input power for both types, state-by-state running costs, and the two cases where a portable still makes sense.
Read the guideReverse cycle air conditioning heats a room for about a third of what any plug-in heater costs. The state-by-state numbers for fan, oil column and reverse cycle heating, and why the brand on the box never changes the bill.
Read the guideA reverse cycle split heats a room for about a third to a seventh of what a gas space heater costs, state by state on today's rates. What whole-home ducted gas costs by comparison, and the one thing gas still has going for it.
Read the guideSpring is the safest window almost everywhere, and early autumn is a close second, because both hit the one number that actually matters: soil above 18°C. The best-window table for every capital city, plus the watering-in schedule that decides whether new turf actually roots.
Read the guideLaying your own turf on our calculator's 66 m² worked example saves $400–$790 in labour, with no tool hire eating into it the way paving or decking's does. The real risk is a same-day deadline, not a rushed base, turf is alive when it's dropped off.
Read the guidePouring a 12 m² shed slab yourself in ready-mix costs roughly $380 to $480 in materials. Paying a concreter to supply and lay the same slab runs $900 to $1,320. What that gap buys, and the one DIY option that's actually the most expensive of the three.
Read the guideNew concrete is walkable in 24–48 hours and safe for a car at 7 days, but that's only about two-thirds of its final strength. Full design strength, the point trucks and caravans need, takes the full 28 days, sourced from CCAA and Boral's own technical guides.
Read the guideComposite costs $4,200–$6,600 installed against treated pine's $2,400–$3,360 for the same 12 m² deck. Add ten years of the oiling pine actually needs and that gap closes, or reverses, depending on the timber and how badly you want to keep its colour.
Read the guideBuilding your own 12 m² treated pine deck saves roughly $1,780–$2,740 in labour over hiring a carpenter to supply and build the same deck. A post-hole borer hire runs about $100–$120, and the real risk isn't the boards, it's the permit and footing depth a licensed builder already knows to check.
Read the guideA standard showerhead costs 6–8¢ a minute to heat, depending on your state's electricity rate. Swap it for an old, unrestricted head and that triples to 11¢; swap it for a water-efficient one and it drops under 5¢, the showerhead moves this number more than the shower length does.
Read the guideA family of four saves roughly $700 to $1,000 a year switching an electric storage tank for a heat pump, before the federal rebate on the purchase price.
Read the guideBulk bark or wood chip costs $60–$113 a load and lasts 12–18 months. A sugar cane or pea straw top-up costs $24–$44 but needs doing again in 6–8 months. Priced over 3 years on the same 10 m² bed, the cheap-looking bale still comes out ahead, just not by the margin the sticker price suggests.
Read the guideUnder 50mm of mulch is cosmetic only, weeds germinate through it within weeks. Three Australian sourcing guides converge on 75–100mm as the real threshold, and there's a good reason not to go past it.
Read the guideA basic gravel driveway installs for $1,080–$1,800 on an 18 m² strip, cheaper than concrete's $1,620–$1,980 or pavers' $2,340–$3,600. Add ten years of the top-ups gravel actually needs and concrete comes out ahead, the calculator's own one-off number doesn't capture that.
Read the guideLaying your own pavers on a 21 m² patio saves roughly $945–$1,260 in labour over hiring a paver to supply and lay the same job. A plate compactor hire costs about $64 a day, the real risk is a rushed base, which costs $400–$1,000 to fix if it sinks.
Read the guideResanding a 21 m² patio with polymeric sand costs about $133, sealing runs $168–$315 every couple of years, and relevelling the base runs $400–$1,000.
Read the guideOne coat only covers a same-colour touch-up. Two is the standard for any real colour change. A third coat, or a coat of primer first, both get you through bare plaster or a dark-to-light repaint, but in Australia the primer route usually costs more, not less.
Read the guidePainting our calculator's 48 m² worked room yourself costs $42–$162 in paint, against $960–$1,680 to hire a professional for the identical walls.
Read the guideAt the registry-median 4 loads a week, a heat pump dryer saves about $195 a year over a vented one. At the same 8kg capacity, the cheapest heat pump model costs $300–$1,150 more than the cheapest vented model, a payback of roughly 1.5 to 6 years depending which one you buy.
Read the guideA vented dryer needs a hole through an outside wall. Condenser and heat pump models don't, but a condenser costs more to buy than the cheapest heat pump and more to run, the one dryer type on the market with no real economic case for itself.
Read the guideAn old fridge exiled to the garage costs $183–$255 a year more to run than a dedicated bar fridge doing the identical job. A new bar fridge starts at $229, which pays for itself inside 15 months everywhere in Australia, well before any state buyback rebate even enters the maths.
Read the guideA fridge with a worn or gappy door seal can use up to 20% more power, roughly $18 a year extra on a modern fridge in NSW, $44 to $61 on an old one. A 60-second paper test finds it, and it matters more than fiddling with the temperature dial.
Read the guideSPASA and Zodiac Australia both put pool pump run time at 8–10 hours a day in summer, 4–6 in winter, aimed at one full turnover of the water.
Read the guideA variable speed pool pump uses about 68% less power than a single speed pump doing the same job, worth $450 (ACT) to $626 (SA) a year at default hours.
Read the guideAn Xbox left on its factory-default ‘Instant-On’ standby draws about ten times the power of ‘Energy saving’, roughly $18 to $25 a year for a free change.
Read the guideYes, more than screen size alone suggests. Independent measurements on a real 65-inch OLED put Vivid mode at roughly 37% more power than Standard, and Australia's own GEMS television standard requires a warning when a TV is left in the even-brighter Store mode it usually ships in on the showroom floor.
Read the guideThe TV and the game console aren't the standby drain worth chasing any more, this site already has a guide for each. The wireless router is: it's the one household device that's never actually switched off, and on its own it can cost more a year than most of a house's other standby gadgets put together.
Read the guideWalk your home once and tally the real standby cost: router, lounge and kitchen, using this site's own sourced wattage figures. A typical home lands at $44 to $61 a year.
Read the guideWe pulled the government's own energy rating registry and checked every one of the 4,724 TV models currently sold in Australia. 1 in 6 has never had its standby power tested at all, and not one of the rest breaks 1.1 watts.
Read the guideHeating and cooling, hot water and the fridge do most of the damage, usually well over half a typical Australian power bill. Here's every major appliance ranked by what it actually costs to run, on current state rates, each with a calculator to work out yours.
Read the guideYes, for most owner-occupiers with a decent roof, but the maths has shifted. Feed-in tariffs have fallen, so the savings are now in using your own solar by day, not selling it back. Typical payback is around 2 to 5 years. General guide, not financial advice.
Read the guidePublic fast chargers cost noticeably more than home charging, and the gap swings wide between networks and even between sites on the same network. Real 2026 rates from Evie, NRMA, Ampol and Tesla, compared against charging at home.
Read the guideOur EV charging calculator compares one EV against one petrol car. Real cars range from small hatch to large SUV, and the dollar saving from going electric doesn't scale neatly with size.
Read the guideOur EV vs petrol running-cost guide keeps flagging the purchase price gap without ever pricing it. Here's what nine real 2026 models cost to buy, small, medium and large, plus a second EV in every one of the three classes.
Read the guideThe ATO's cents-per-kilometre method caps out at $4,550 a year. The logbook method has no cap, and a real ute's actual running costs can beat that cap even at a modest business-use share. Real 2026-27 numbers for both methods.
Read the guideA $110 total including GST comes to $100 excluding GST, not $99, the number a flat 10% subtraction gives. The correct math, plus where this mistake actually costs money.
Read the guideCall a $1,760 job a quote and the price is locked in once the client accepts it. Call it an estimate and that figure can move. The legal difference, and what to do when a job runs over.
Read the guideA job quoted at $1,760 stays $1,760 even if it runs four hours over, the real hourly rate drops to $56.67. Billed hourly, the same overrun pays $2,134 and the rate holds at $85. The maths behind which method protects your margin.
Read the guideSydney, Melbourne, Brisbane and Adelaide's petrol cycles have mostly stopped since Feb 2026. Perth's weekly cycle still runs. What still works for timing a fill-up.
Read the guideSide and rear fences can go up to 1.8 to 2.3 metres without council sign-off, depending on the state. Front and pool fences are stricter everywhere. The real limit, state by state.
Read the guideEvery state has a notice-then-apply process for a fencing dispute, but the venue differs: Local Court or NCAT in NSW, QCAT in Queensland, ACAT in the ACT. Where to apply, state by state.
Read the guideThe ATO's 70¢ fixed rate is the simple option for a work-from-home deduction. The actual cost method has no cap and can beat it, but usually only with a dedicated office. A real worked example, and when each one wins.
Read the guideThe Energy Rating star count only compares machines of the same size. Real 8kg front loaders in the government's own registry cost $34.63 to $137 a year to run, roughly four times apart, at the identical capacity.
Read the guideThe Australian Government puts the gap at 50% for a front loader and 85% for a top loader, not the flat 'half' most advice rounds to. Applied to the registry medians our calculator already uses, that's $17 to $53 a year depending on your state and loader type.
Read the guideGas beats induction on efficiency-adjusted cost in NSW, Victoria, Queensland and South Australia, but induction wins in WA, Tasmania and the ACT. The full state-by-state cooktop cost table.
Read the guideThe Energy Rating star count only compares dishwashers of the same place-setting count. Real 14-place-setting models in the government's own registry cost $25.34 to $103.89 a year to run, roughly four times apart, at the identical capacity.
Read the guideRunning eco instead of normal cuts a dishwasher cycle's energy by a third everywhere in Australia. What that's actually worth ranges from $23.57 a year in the ACT to $32.78 in South Australia.
Read the guideYes, in raw kWh. But per litre of storage, the registry shows a large chest freezer costs about half as much to run as a small one.
Read the guideYes, roughly another router's worth of running cost per extra satellite. A 3-node mesh kit costs about $41 to $57 a year more than a single router, depending on your state.
Read the guideYes, by a wide margin: a gaming desktop and monitor draws roughly twice what a PS5 or Xbox Series X pulls under load, per Digital Foundry's measured wattages.
Read the guideTwo Australian government energy bodies confirm the physics: a reversed fan on low pushes warm air back down. Neither publishes a dollar saving, but running the fan itself all winter costs about what one hour of the heater does.
Read the guideAGL's own advice says a hot water bottle uses less energy than an electric blanket. True if the blanket runs all night, but pre-warm it the recommended way and it costs less than one kettle boil.
Read the guideBest case, using Sustainability Victoria's own savings claim: R4.0 batts pay back in 6.8 to 9.2 years DIY, 10 to 22 years installed. The full state-by-state numbers.
Read the guideA cheap non-woven weed mat for our 18 m² gravel driveway example costs $29 but needs relaying every 2 to 4 years. A heavier 140 gsm commercial fabric costs $44 once and does a job the cheap mat can't: stopping the gravel itself sinking into the ground.
Read the guideTen real 8kg front loaders from the government's own appliance registry, ranked by running cost in NSW. The cheapest costs $34.63 a year to run at five loads a week; our own star-rating guide finds the least efficient model in the same size class costs $137.
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