Calculate Electricity Cost from kWh
Enter your energy usage and price per kilowatt-hour below.
What Is a kWh Cost Calculator?
A kWh Cost Calculator estimates the cost of electricity from your energy consumption in kilowatt-hours and the electricity price charged per kWh. It is useful for estimating household, office, appliance, or business energy expenses.
Electricity companies commonly measure consumed electrical energy in kilowatt-hours. Multiplying this consumption by your energy rate gives the basic usage cost before any additional taxes, service fees, or fixed charges.
kWh Cost Formula
The basic electricity cost formula is straightforward: multiply the amount of electrical energy consumed by the rate charged for each kilowatt-hour.
For repeated periods, the calculation can be extended by multiplying the energy cost by the number of periods.
How to Use the kWh Cost Calculator
- Enter your electricity consumption.
- Choose Wh, kWh, or MWh as the energy unit.
- Enter the electricity rate charged per kWh.
- Select your preferred currency.
- Enter the number of repeated billing or usage periods if needed.
- Optionally enter any fixed charge applied per period.
- Click Calculate kWh Cost.
The calculator will show total energy consumption, energy-only cost, fixed charges, cost per period, and overall estimated cost.
kWh Cost Calculation Example
Suppose your household uses 350 kWh of electricity and your electricity rate is $0.20 per kWh.
Cost = $70.00
This means the energy portion of the electricity cost is approximately $70 before fixed fees, taxes, surcharges, or other charges are added.
How Much Does 1 kWh Cost?
The cost of one kWh depends entirely on the electricity rate charged by your energy provider. If your rate is $0.20 per kWh, then one kWh costs $0.20.
= $0.20
Because electricity rates vary by provider, location, plan, billing tier, and time period, use the actual rate shown on your electricity bill whenever possible.
Examples of Electricity Cost by kWh
| Energy Usage | Rate | Estimated Cost |
|---|---|---|
| 1 kWh | $0.20/kWh | $0.20 |
| 10 kWh | $0.20/kWh | $2.00 |
| 50 kWh | $0.20/kWh | $10.00 |
| 100 kWh | $0.20/kWh | $20.00 |
| 350 kWh | $0.20/kWh | $70.00 |
| 500 kWh | $0.20/kWh | $100.00 |
| 1,000 kWh | $0.20/kWh | $200.00 |
kWh, Wh and MWh Explained
Watt-Hour
One watt-hour represents one watt of power used continuously for one hour. One thousand Wh equals one kWh.
Kilowatt-Hour
One kilowatt-hour equals 1,000 watt-hours. It is the most common unit used for residential electricity billing.
Megawatt-Hour
One megawatt-hour equals 1,000 kWh and is commonly used when describing larger commercial or industrial energy quantities.
How to Calculate Monthly Electricity Cost
If you know your total monthly electricity consumption, multiply that number directly by your electricity rate per kilowatt-hour.
For example, 450 kWh at $0.18 per kWh would produce an energy-only cost of $81 for the month.
How to Calculate Annual Electricity Cost
If your monthly electricity use is relatively consistent, you can estimate annual energy cost by multiplying monthly cost by 12.
For a more accurate annual estimate, total the actual kWh consumption from each billing period because energy use and rates can change throughout the year.
Why Your Electricity Bill May Be Higher
The simple kWh cost formula estimates the energy portion of a bill, but electricity bills can contain several additional charges. The final amount may therefore differ from a basic energy calculation.
Fixed Fees
Some providers charge fixed monthly service, meter, or connection fees regardless of how many kWh are consumed.
Tiered Rates
The price per kWh can change after electricity consumption crosses certain usage thresholds.
Taxes & Surcharges
Taxes, fuel adjustments, regulatory fees, and other surcharges may be added to the energy cost.
How to Find Your Electricity Rate per kWh
Your electricity rate can usually be found on your electricity bill or tariff information. Look for a charge expressed as currency per kilowatt-hour, such as $0.18/kWh or Rs 50/kWh.
If the bill uses multiple pricing tiers or time-of-use rates, a single rate may only provide an approximation. For those billing structures, each tier or time period should ideally be calculated separately.
Frequently Asked Questions
How do I calculate electricity cost from kWh?
Multiply the number of kilowatt-hours consumed by your electricity rate per kWh. For example, 100 kWh at $0.20 per kWh costs $20 before additional charges.
How much does 100 kWh cost?
The answer depends on your electricity rate. At $0.20 per kWh, 100 kWh would cost approximately $20.
How much does 500 kWh cost?
At a rate of $0.20 per kWh, 500 kWh costs approximately $100 before taxes, fixed fees, or other charges.
What does cost per kWh mean?
Cost per kWh is the amount charged for consuming one kilowatt-hour of electrical energy.
Can I calculate monthly electricity cost?
Yes. Enter your monthly kWh consumption and your rate per kWh. The calculator will estimate the energy cost for that billing period.
Does this calculator include taxes?
Not automatically. You can include known fixed charges, but taxes, tiered prices, regulatory fees, and other variable charges may need to be added separately.
What if my electricity rate changes with usage?
For tiered electricity rates, calculate each usage tier separately and add the costs together for a more accurate estimate.