Why is my electricity bill higher than my appliance totals?

Usually because of fixed standing charges and taxes outside the unit rate, standby and always-on loads that are easy to forget, and underestimated running hours on heating and cooling. Tiered or slab tariffs can also price later units higher than the rate you assumed.

Free Energy Cost Estimator

Electricity Cost Calculator — What Does It Cost to Run?

Q: How much electricity does an air conditioner use per hour?

A 1.5 ton split unit draws around 1,500 W, so about 1.5 kWh per hour of compressor running time. Six hours a day is roughly 270 kWh a month, or about $45.90 at $0.17 per kWh. Inverter units draw less once the room reaches temperature.

Q: How much does standby power cost?

A device drawing 10 W continuously uses 87.6 kWh a year, about $14.89 at $0.17 per kWh. Across a whole home, standby and always-on equipment commonly accounts for 5 to 10 percent of the bill.

Turn watts into money. Work out the running cost of any appliance per hour, day, month and year, estimate your whole bill from your kWh usage, or compare an old device against a new one and see how fast the upgrade pays for itself.

30+ appliance presetsPer hour, day, month & yearAny currency & tariffUpgrade payback periodCO₂ estimate

Step 1 — Your usage

Appliance preset

Power ratingwatts

Hours used per dayhrs

Days used per weekdays

Number of unitsqty

Power draw1,500 W

03,000 W

Step 2 — Your tariff

Currency

Price per kWh (unit rate)/kWh

Grid carbon intensity

Your unit rate is on your bill, usually labelled price per kWh or per unit. Include taxes if your bill quotes an all-in rate.

Your running cost

Cost to run per month0per month

Energy per day0

Cost per day0

Cost per year0

CO₂ per year0

Cost per hour0

Energy per year0

Cost per week0

Verdict—

Choose an appliance or enter its wattage to see the running cost.

Why this electricity cost calculator is different

Most energy calculators do one sum: watts times hours times your rate. That tells you what a device costs, but not whether it is worth replacing, not what it is doing to your bill, and not what your bill should look like in the first place. This tool answers all three questions with the same tariff settings.

30+ appliance presets

Pick an air conditioner, geyser, fridge, dryer, gaming PC or EV charger and the wattage and typical daily hours fill in for you. Override either figure whenever you know your own numbers.

Per hour, day, week, month and year

The same device looks trivial per hour and alarming per year. Seeing every timescale at once is what changes behaviour, so all of them stay on screen together.

Upgrade payback period

Enter what the efficient replacement costs and see how many years of energy savings it takes to pay for itself. Almost no competing calculator closes that loop.

Whole-bill estimator

Enter the kWh from your meter or bill, add fixed charges and tax, and get the monthly total, the daily cost and your true average price per unit once standing charges are included.

Carbon estimate for your grid

Choose your country’s grid intensity and see the annual CO₂ attached to the same usage. A UK kWh and an Indian kWh carry very different footprints.

Any currency and tariff

Dollars, pounds, euros, rupees and more, with your own unit rate. Nothing is hard-coded to one country, and nothing is uploaded anywhere.

How to use the electricity cost calculator

Choose the calculation

Appliance cost for a single device, Monthly bill to price up your whole meter reading, or Upgrade payback to test whether a more efficient model is worth buying.

Enter the wattage and hours

The rating plate on the appliance, its manual or the label on the plug gives you watts. Pick a preset if you do not have it to hand, then set realistic daily hours — this is where most estimates go wrong.

Set your tariff

Copy the price per kWh from your latest bill and pick your currency. If your supplier charges a standing or fixed monthly fee, add it in the Monthly bill tab rather than the unit rate.

Read the timescales that matter

Use cost per hour to decide whether to switch something on, and cost per year to decide whether to keep owning it. Tap Copy results to share the breakdown with whoever pays the bill.

The formula, and what it costs to run common appliances

Every result here comes from one equation: kilowatt-hours = watts × hours ÷ 1,000. Multiply the kWh by your unit rate and you have the cost. A 1,000 W device running for one hour uses exactly one kilowatt-hour, which is the unit your meter counts and your supplier bills.

Typical appliance wattage and monthly running cost
Appliance	Typical power	Typical use	kWh per month	Cost per month at $0.17
Split air conditioner (1.5 ton)	1,500 W	6 h/day	270	$45.90
EV charger (level 2)	7,200 W	2 h/day	432	$73.44
Portable space heater	1,500 W	5 h/day	225	$38.25
Electric water heater	2,000 W	2 h/day	120	$20.40
Refrigerator (average draw)	150 W	24 h/day	108	$18.36
Clothes dryer	3,000 W	1 h/day	90	$15.30
Desktop PC and monitor	200 W	8 h/day	48	$8.16
Electric oven	2,400 W	30 min/day	36	$6.12
Dishwasher	1,200 W	1 h/day	36	$6.12
Ceiling fan	75 W	12 h/day	27	$4.59
Water pump	750 W	1 h/day	22.5	$3.83
Washing machine	500 W	1 h/day	15	$2.55
55-inch LED TV	100 W	5 h/day	15	$2.55
Electric kettle	1,500 W	18 min/day	13.5	$2.30
Laptop	50 W	8 h/day	12	$2.04
Incandescent bulb	60 W	5 h/day	9	$1.53
Wi-Fi router (always on)	10 W	24 h/day	7.2	$1.22
LED bulb	9 W	5 h/day	1.35	$0.23

Cost per hour by wattage and unit rate

Hourly running cost by appliance wattage and electricity rate
Power	At $0.12/kWh	At $0.17/kWh	At $0.25/kWh	At $0.35/kWh
100 W	$0.012	$0.017	$0.025	$0.035
500 W	$0.060	$0.085	$0.125	$0.175
1,000 W	$0.120	$0.170	$0.250	$0.350
1,500 W	$0.180	$0.255	$0.375	$0.525
2,000 W	$0.240	$0.340	$0.500	$0.700
3,000 W	$0.360	$0.510	$0.750	$1.050

Wattages are typical mid-range figures for planning. Motor-driven appliances such as fridges, air conditioners and pumps cycle on and off, so their average draw over a day is lower than the rating plate peak.

Where the money actually goes, and how to cut it

Heating and cooling, water heating and anything with a heating element dominate almost every bill. Chasing small electronics while a 2,000 W geyser runs twice a day is effort spent in the wrong place.

Attack heat first. Air conditioning, space heaters, water heaters, dryers and ovens are all in the 1,500–3,000 W band and dwarf everything else you own.
Move the thermostat, not the appliance. Each degree of setback on heating or cooling typically shifts consumption by several percent, and it costs nothing to try.
Shorten run time rather than buying new. Halving the daily hours of a 1,500 W device saves as much as replacing it with a model that is twice as efficient.
Kill standby loads. A permanently powered 10 W device costs 87.6 kWh a year on its own, and a typical home has a dozen of them.
Swap the last incandescent bulbs. A 9 W LED does the work of a 60 W bulb and saves roughly 93 kWh per bulb per year at five hours a day.
Run the washer and dishwasher full, and on cold or eco cycles where possible — almost all the energy goes into heating the water, not turning the drum.
If your tariff has off-peak hours, shift the dryer, dishwasher and EV charging into them. Same energy, lower rate.

Electricity cost calculator FAQs

How do I calculate the electricity cost of an appliance?

Multiply the appliance wattage by the hours you use it, divide by 1,000 to get kilowatt-hours, then multiply by your price per kWh. For example, a 1,500 W air conditioner running 6 hours a day uses 9 kWh a day, which costs $1.53 at $0.17 per kWh, or about $45.90 a month.

How much does it cost to run a 1500 watt heater for an hour?

A 1,500 W heater uses 1.5 kWh per hour. That is $0.26 an hour at $0.17 per kWh, $0.38 at $0.25 and $0.53 at $0.35. Run for 5 hours a day it costs roughly $38 a month at $0.17.

What is a kilowatt-hour (kWh)?

A kilowatt-hour is the energy used by a 1,000 W device running for one hour. It is the unit your meter counts and the unit your supplier prices, which is why every running cost has to be converted into kWh before it can be turned into money.

How much electricity does an air conditioner use per hour?

A 1.5 ton split unit draws around 1,500 W, so it uses about 1.5 kWh per hour of compressor running time. Six hours a day works out at roughly 270 kWh a month, or about $45.90 at $0.17 per kWh. Inverter units draw less once the room reaches temperature.

How do I convert watts to kilowatt-hours?

Divide the watts by 1,000 to get kilowatts, then multiply by the number of hours the device runs. So 750 W for 4 hours is 0.75 kW multiplied by 4, which is 3 kWh.

Why is my bill higher than my appliance totals?

Three reasons usually explain the gap: fixed standing charges and taxes that are not part of the unit rate, standby and always-on loads that never appear on anyone’s mental list, and underestimated run hours on heating and cooling. Tiered or slab tariffs also push later units to a higher rate than the one you assumed.

How much does standby power cost?

A device drawing 10 W continuously uses 87.6 kWh a year, which is about $14.89 at $0.17 per kWh. Across a whole home, standby and always-on equipment commonly accounts for 5–10% of the total bill.

How much does switching to LED bulbs save?

A 9 W LED replacing a 60 W incandescent used 5 hours a day saves about 93 kWh per bulb per year, worth roughly $15.80 at $0.17 per kWh. Ten bulbs make that a $158 a year difference for a one-off cost of a few dollars each.

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Find out what is really driving your bill

Price up your three biggest appliances, then check the payback on replacing the worst one. Most households find a single device accounts for a third of the bill — and it is rarely the one they suspected.

Results are estimates based on the figures you enter. Actual consumption varies with appliance efficiency, ambient temperature, cycling behaviour and tariff structure.