Productive ToolboxElectric Bill Calculator
Estimate your electricity bill from kWh or appliance watts at your own price per kWh. Flat or tiered rates, fixed charges and tax, in any currency.
Electric Bill Calculator
Enter your kWh, or estimate it from appliance watts, then add your price per kWh. Works with flat or tiered rates in any currency.
Settings
Electricity Consumption
The kWh figure on your bill or meter reading.
Flat Rate
Use the rate on your bill. Starting value: a typical USD rate; pick a preset below or type your own.
Additional Charges
Quick Presets
Related tools
What Is an Electric Bill Calculator?
An electric bill calculator turns the electricity you use into money. Give it your usage in kilowatt-hours (kWh) and the price you pay per kWh, add any fixed charges and tax, and it returns the bill, line by line.
You don't need a past bill to start. If you only know your appliances, switch to Estimate from watts: enter each device's wattage and how many hours a day it runs, and the calculator works out the kWh for the billing period and prices it at your rate. That makes it just as useful for budgeting a new home, checking what a space heater or an EV charger will add, or comparing a supplier's offer.
It works anywhere. The calculator opens in your local currency (US dollar, euro, pound, Canadian or Australian dollar), handles flat and tiered (block) pricing, and includes presets for the U.S. average, the UK price cap and the EU average. Every number stays editable, so you can match your own utility's tariff exactly.
How to Calculate Your Electric Bill
Every electricity bill comes down to three steps: find the energy used, price it, then add the fixed parts.
Core Formulas
Energy (kWh) = watts × hours per day × days ÷ 1,000
Energy cost = kWh × price per kWh
Bill = energy cost + fixed charges + tax
Worked examples
- From a meter reading (U.S.): 900 kWh × $0.18 = $162.00 of energy. Add your utility's monthly customer charge and any local tax to get the full bill.
- From an appliance's watts: a 1,500 W space heater used 4 hours a day for 30 days uses 1,500 × 4 × 30 ÷ 1,000 = 180 kWh, which costs 180 × $0.18 = $32.40.
- With a standing charge (UK): 270 kWh × £0.2632 = £71.06, plus 30 days × 54.83p = £16.45, gives a bill of £87.51.
How to Use the Electric Bill Calculator
Step-by-Step Guide
- 1Enter your usage: Type the kWh from your bill or meter, or switch to "Estimate from watts" and list your appliances with their watts and hours of use per day.
- 2Choose your currency: The calculator starts in your local currency; change it if your bill is in another one.
- 3Enter your price per kWh: Copy the energy (unit) rate from your bill, or pick a preset such as the U.S. average, the UK price cap or the EU average.
- 4Switch to tiered if your utility uses tiers: If your tariff charges more per kWh above a threshold, choose Tiered and enter each band's range and rate.
- 5Add fixed charges and tax: Enter any monthly service, customer or standing charge and the tax percentage shown on your bill.
- 6Read the total: The total bill, energy cost, tax and a line-by-line breakdown update as you type; copy, save or export them.
What This Calculator Does
- ✓Bill from kWh, or kWh estimated from appliance watts
- ✓Your own price per kWh, in your local currency
- ✓Flat and tiered (block) pricing
- ✓Standing, service and meter charges
- ✓Tax as a percentage of the bill
- ✓Presets: U.S. average, UK price cap and EU average
- ✓Line-by-line cost breakdown
- ✓History saved
- ✓CSV and text export
- ✓Your inputs are not collected or stored
How Much Electricity Do Appliances Use?
Typical monthly use and cost over 30 days at the U.S. average of $0.18 per kWh. Wattage is on the appliance's label or manual; your own hours and rate will differ, so enter them in Estimate from watts above.
| Appliance | Power | Use per day | kWh per month | Cost per month |
|---|---|---|---|---|
| LED bulb | 10 W | 5 h | 1.5 kWh | $0.27 |
| Ceiling fan | 75 W | 8 h | 18 kWh | $3.24 |
| Refrigerator (average draw) | 60 W | 24 h | 43.2 kWh | $7.78 |
| Television | 100 W | 4 h | 12 kWh | $2.16 |
| Laptop | 60 W | 6 h | 10.8 kWh | $1.94 |
| Desktop PC | 250 W | 4 h | 30 kWh | $5.40 |
| Washing machine | 500 W | 1 h | 15 kWh | $2.70 |
| Microwave | 1,100 W | 18 min | 9.9 kWh | $1.78 |
| Window / portable AC | 1,500 W | 6 h | 270 kWh | $48.60 |
| Space heater | 1,500 W | 4 h | 180 kWh | $32.40 |
| Clothes dryer | 3,000 W | 1 h | 90 kWh | $16.20 |
| Water heater (tank) | 4,500 W | 3 h | 405 kWh | $72.90 |
| EV charger (Level 2) | 7,200 W | 1 h | 216 kWh | $38.88 |
* A refrigerator is rated at 100–200 W, but its compressor cycles on and off, so about 60 W on average is closer to real use.
Average Electricity Prices per kWh
Use the rate on your own bill whenever you can. If you don't have one, these published averages are a reasonable starting point.
| Region | Residential price | Source |
|---|---|---|
| United States – average home | ≈ 18¢ per kWh | EIA, 2026 |
| United States – range by state | ≈ 13¢ (Nevada) to 50¢+ (Hawaii) | 2026 state averages |
| United Kingdom – price cap | 26.32p per kWh + 54.83p per day | Ofgem, Oct–Dec 2026 |
| European Union – household average | ≈ €0.29 per kWh, taxes included | Eurostat, 2nd half 2025 |
| Germany | ≈ €0.39 per kWh | Eurostat, 2nd half 2025 |
| Ireland | ≈ €0.40 per kWh | Eurostat, 2nd half 2025 |
| Hungary | ≈ €0.11 per kWh | Eurostat, 2nd half 2025 |
* Prices change often and vary by utility, supplier, plan and time of day. UK and EU figures include VAT and taxes.
Flat, Tiered and Time-of-Use Pricing
- Flat rate: every kWh costs the same. This is the most common plan in the UK and much of Europe, and for many U.S. utilities.
- Tiered (block) rate: the price steps up once you pass a threshold. Each block is charged only for the kWh inside it: with 0–500 kWh at $0.15 and 501+ at $0.20, a 700 kWh month costs 500 × 0.15 + 200 × 0.20 = $115, not 700 × 0.20.
- Time-of-use: the price depends on the hour, cheaper overnight and dearer at the evening peak. Enter your usage-weighted average rate as a flat rate, or work out peak and off-peak kWh separately and add the two results.
Real-World Examples
Checking a U.S. monthly bill
A household in Ohio used 900 kWh last month. At 18¢ per kWh the energy costs $162.00; adding the utility's $10 customer charge gives $172.00 before tax, so a $175 bill checks out once local tax is included.
What a space heater really costs
A renter in Chicago wants to know whether a 1,500 W space heater is affordable. Running it 4 hours a day for 30 days uses 180 kWh, adding $32.40 a month at $0.18 per kWh.
UK bill with a standing charge
A flat in Manchester uses 270 kWh a month on the price-cap tariff. Energy costs £71.06 at 26.32p per kWh, and the 54.83p daily standing charge adds £16.45, for a bill of £87.51.
Budgeting in the EU
A couple moving to Spain expects to use about 300 kWh a month. At the EU average of €0.29 per kWh, taxes included, they budget €87 a month for electricity.
Charging an electric car at home
A driver in Texas charges a car on a 7.2 kW Level 2 charger for an hour a day. That is 216 kWh a month, or $38.88 at $0.18 per kWh, which they compare with their monthly fuel spend.
Small business with sales tax
A small shop uses 1,200 kWh a month at $0.18 per kWh with a $25 service charge and 8% tax. Energy is $216, the subtotal $241, tax $19.28, and the total bill $260.28.
Tips to Lower Your Bill & Common Mistakes
Tips
- 💡Find your all-in rate: divide last month's total bill by the kWh used. It includes delivery charges and fees, so it predicts your next bill better than the headline energy rate.
- 💡Target heating and cooling first. Water heaters, space heaters, air conditioners and dryers run at 1,500–4,500 W, so an hour less a day saves far more than switching off lights.
- 💡Swap remaining incandescent bulbs for LEDs: a 60 W bulb and a 10 W LED give similar light, and the LED uses about a sixth of the energy.
- 💡On a time-of-use plan, run the dishwasher, washing machine and EV charger overnight, when the rate is lowest.
- 💡Save a calculation each month to see whether a higher bill came from using more kWh or from a price rise.
Common Mistakes
- ✕Mixing up watts and kWh. Watts are how fast a device uses power; kWh are how much it used. Divide by 1,000 and multiply by hours to go from one to the other.
- ✕Using an appliance's maximum rating for devices that cycle. Fridges, freezers and thermostatic heaters are only drawing full power part of the time.
- ✕Adding tax twice. UK and EU unit rates usually include VAT already; add tax only when your bill lists it separately.
- ✕Forgetting the standing or customer charge. It is billed every day or month even at zero usage, and can be a large share of a small bill.
- ✕Charging every kWh at the top tier on a tiered plan. Each block has its own price and applies only to the kWh inside it.
Frequently Asked Questions
How do I calculate my electric bill?
Multiply the kWh you used by your price per kWh, then add fixed charges and tax: Bill = (kWh × price per kWh) + fixed charges + tax. For example, 900 kWh at $0.18/kWh is $162.00 of energy, before any customer charge or tax.
How do I convert watts to kWh?
kWh = watts × hours ÷ 1,000. A 1,500 W space heater running 4 hours a day for 30 days uses 1,500 × 4 × 30 ÷ 1,000 = 180 kWh, which costs $32.40 at $0.18/kWh.
What is a kWh?
A kilowatt-hour (kWh) is the unit of energy on your bill: 1,000 watts used for one hour. A 100 W TV running for 10 hours also uses 1 kWh.
What is the average electricity price per kWh?
About 18¢ per kWh for U.S. homes in 2026 (EIA), from roughly 13¢ in the cheapest states to over 50¢ in Hawaii. The EU household average was about €0.29 per kWh including taxes in the second half of 2025 (Eurostat), and the UK price cap for October–December 2026 is 26.32p per kWh plus a 54.83p daily standing charge (Ofgem).
What is a standing charge?
A fixed daily fee for being connected to the grid, charged even if you use no electricity. It is common in the UK and Europe. Multiply it by the days in your bill and enter it as the service charge, for example 54.83p × 30 days = £16.45.
Should I add tax?
Only if your rate excludes it. UK price-cap rates and the Eurostat averages already include VAT and taxes, so leave tax at 0 when you use them. Many U.S. bills list state or local taxes separately; enter that percentage in the tax field.
What is tiered (block) electricity pricing?
Your usage is split into bands with their own price, and each band is charged only for the kWh inside it. With 0–500 kWh at $0.15 and 501+ at $0.20, a 700 kWh month costs 500 × 0.15 + 200 × 0.20 = $115.
Why is my calculated bill different from my actual bill?
Utilities often add delivery or transmission charges, fuel or energy adjustments, regulatory fees and rounding. Enter the all-in average by dividing your total bill by the kWh used, or add the extra fees as service charges, to match your bill.
Which appliances use the most electricity?
Anything that heats or cools: water heaters, space heaters, air conditioners, clothes dryers and EV chargers. A 4,500 W tank water heater running 3 hours a day uses about 405 kWh a month, while an LED bulb uses 1.5 kWh.
Is my data private?
Yes. We do not collect or store what you enter. Any history the tool keeps is visible only to you.
Who Uses This Electric Bill Calculator?
Homeowners
Check a monthly bill, spot billing errors, and see which appliances drive the cost.
Renters & Movers
Budget for electricity before signing a lease or moving to a new city or country.
EV Owners
Work out what home charging adds to the bill and compare it with fuel.
Small Businesses
Estimate monthly energy costs and compare supplier or utility quotes.
Solar Shoppers
Measure current usage and spending before sizing solar panels or a battery.
Students & Teachers
Practice converting watts to kWh and pricing energy use for science and economics classes.
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