Free electricity bill calculator. Enter monthly kWh or one appliance's watts and hours, plus your rate, fixed fees, and taxes, for a full bill estimate.
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Energy use is measured in kilowatt-hours: kWh = watts × hours / 1000. In bill mode the calculator takes the monthly kWh straight from your bill; in appliance mode it converts one appliance's watts and daily hours into monthly kWh. Energy cost is kWh times your electricity rate per kWh. The full bill adds your fixed monthly supply or meter fee, then applies taxes and surcharges to the subtotal, which is how real utilities build a bill. Daily cost is the total divided by the days in your billing month, and the effective cost per kWh (total divided by kWh) shows what you truly pay per unit once fixed fees and taxes are folded in. This calculator gives estimates for planning, not professional energy or financial advice.
Every electricity bill starts with the kilowatt-hour (kWh), the unit of energy utilities charge for. One kWh is 1,000 watts running for one hour, so the energy any appliance uses is kWh = watts × hours / 1000. A 100-watt device running 8 hours a day uses 0.8 kWh per day.
Energy cost is that kWh total times your rate per kWh. At $0.16 per kWh, the 0.8 kWh above costs $0.128 per day, about $3.84 over a 30-day month. But the energy charge is only one part of a real bill: utilities add a fixed monthly supply or meter fee whether you use 50 kWh or 5,000, then apply taxes and surcharges to the subtotal. The full bill is energy cost + fixed fee + tax, which is exactly what this calculator builds for you.
Pick your currency, then choose one of two estimate modes. In 'From monthly kWh' mode, enter the kWh figure printed on your most recent bill, your rate per kWh, the fixed monthly fee, and the tax and surcharge percentage: you get the full bill estimate with energy, fixed, and tax lines.
In 'From one appliance' mode, enter the appliance's wattage and how many hours per day it runs: the calculator converts that to monthly kWh first, then prices it the same way. This estimator mode is handy for asking questions like what a space heater adds to the bill. Run it once per appliance and add the results for a whole-house picture.
Watts measure power, the rate of energy flow right now. Kilowatts are just 1,000 watts, and kilowatt-hours measure energy used over time: 1 kW running for 1 hour is 1 kWh. Think of watts as speed and kWh as distance traveled.
This is why a 1,500-watt space heater and a 10-watt LED bulb can both be 'using electricity' yet differ wildly in cost: the heater burns 1.5 kWh per hour of use, while the bulb burns 0.01 kWh. Volts and amps describe the supply (watts = volts × amps), but your bill only ever counts kWh.
Fixed charges are flat monthly fees for grid maintenance, metering, and customer service: they land on your bill even if you use almost no power. On top of the energy charge and fixed fee, utilities add taxes and surcharges (VAT, fuel adjustments, renewable levies), usually as a percentage of the subtotal.
That is why the effective cost per kWh, your total bill divided by your kWh, is higher than your quoted rate. A 350 kWh bill at $0.16 with a $12.50 fixed fee and 8.5% tax totals about $74.32, so the effective rate is $0.21 per kWh, not $0.16. Always compare bills using the effective rate, not the headline rate.
Under flat rate billing, every kWh you use costs the same. In tiered (slab) billing, the rate steps up as you cross usage thresholds: for example, the first 100 kWh at a low rate, the next 200 at a higher one, and everything above at the top rate. Flat rate vs tiered rate electricity matters most in high-use months: cross a threshold and each extra kWh costs more.
On time of use electricity rates, the price follows the clock: peak hours cost more, off-peak (often overnight) costs less. If you are on time-of-use pricing, run the washing machine, dishwasher, and EV charger at night and use your off-peak rate in this calculator for the most accurate estimate.
Heating and cooling dominate most bills: central AC 3,000 to 4,000 W, split AC 1,200 to 1,800 W, space heater 1,500 W, electric water heater 3,000 to 4,500 W. Next come the big kitchen and laundry loads: electric oven 2,000 to 5,000 W, clothes dryer 2,000 to 4,000 W, dishwasher 1,200 to 2,400 W, microwave 800 to 1,500 W.
Running all day but sipping power: refrigerator 100 to 400 W (about 1.5 to 2 kWh per day), desktop computer 200 to 500 W, LED TV 60 to 140 W, laptop 25 to 100 W, LED bulb 8 to 15 W. In a typical home, HVAC takes 40 to 50% of the bill, the water heater 14 to 18%, and lighting only 5 to 10%. Asked which home appliances consume the most electricity, the answer is always the heaters, the coolers, and the hot water.
Start with the biggest loads: set the AC to 24 to 26 C, since each degree lower adds 6 to 8% to cooling energy, and clean AC filters monthly. Swap every bulb for LED, which uses about 75% less energy than incandescent for the same light.
Kill the vampire load: TVs, consoles, microwaves, and chargers draw 5 to 15 watts continuously even when off (also called phantom loads), and standby typically accounts for 5 to 10% of a household bill. Use switched power strips or smart plugs. Finally, shift heavy appliances to off-peak hours if your tariff rewards it, and wash laundry in cold water, since heating water is about 90% of a washing machine's energy.
Run a 1500 watt space heater (1,500 W) 8 hours a day for a 30-day month at $0.16 per kWh, with a $12.50 fixed fee and 8.5% tax. Energy: 1,500 × 8 × 30 / 1000 = 360 kWh. Energy cost: 360 × $0.16 = $57.60. Subtotal: $57.60 + $12.50 = $70.10. Tax: $70.10 × 8.5% = $5.96. Total bill: $76.06.
That is $2.54 per day for one heater. Notice the fixed fee and tax add $18.46 on top of the $57.60 energy cost: this is exactly why the effective cost per kWh ($0.21) matters more than the rate on the tariff sheet.
Convert usage to kWh (watts × hours / 1000), multiply by your rate per kWh for the energy cost, then add your fixed monthly fee and apply the tax percentage: total = energy cost + fixed fee + tax. The calculator above does all four steps.
Subtract the previous reading on last month's bill from your current meter reading: the difference is your kWh used. Multiply by your rate per kWh, add the fixed meter fee, and apply taxes. That difference is the number to enter in 'From monthly kWh' mode.
Watts measure power (the rate of energy flow right now); kilowatt-hours measure energy used over time. 1,000 watts running for one hour is 1 kWh. Your bill counts kWh, never watts.
In order: heating and cooling (40 to 50% of the bill), the water heater (14 to 18%), washer and dryer, the refrigerator, lighting (5 to 10%), and TV and entertainment. Anything with a heating element or compressor is a big user.
The average US home uses about 30 kWh per day (around 900 kWh per month). UK homes average 8 to 10 kWh per day, and a middle-class Indian household uses 3 to 5 kWh per day.
A 1.5-ton split AC draws about 1,200 to 1,800 watts, so roughly 1.2 to 1.8 kWh per hour of compressor run time. Eight hours a day is about 12 kWh per day, or around $1.44 to $2.16 per day at $0.12 to $0.18 per kWh.
Set the AC to 24 to 26 C, switch all bulbs to LED, unplug standby devices or use switched power strips, run heavy appliances at off-peak hours, wash laundry in cold water, and clean AC filters monthly. Cooling and standby loads are the biggest wins.
On your utility bill, listed as cents or dollars per kWh. Check whether your bill shows a single rate or a tiered schedule, and note the fixed fee and tax percentage too, since they change the total.
Check the nameplate or label on the device, its manual, or the manufacturer's specifications. Wattage is often printed directly; if only volts and amps are listed, multiply them: watts = volts × amps. Heating appliances always have the highest wattages.
It prices whatever usage you enter, so to include standby power, run the appliance mode a second time with the standby wattage (often 5 to 15 W) and 24 hours a day, then add it to the first result.
Usage is split into brackets: the first block of kWh is charged at the lowest rate, and each higher block costs more per kWh. Your total is the sum across the blocks you reached, which rewards staying under the thresholds.
Flat monthly fees for grid infrastructure, metering, and customer service (also called customer charges or meter rent). You pay them regardless of usage, which is why a tiny bill is mostly fixed charges.
100 × 24 / 1000 = 2.4 kWh per day. At $0.16 per kWh that is about $0.38 per day, or about $11.52 over a 30-day month before fixed fees and taxes.
No. It is an estimate for planning based on the numbers you enter. Real bills vary with tiered thresholds, time-of-use windows, seasonal rate changes, and metered demand charges. It is not professional energy or financial advice.
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