Electricity Bill Calculator

Estimate your electricity bill free online from appliance wattage, hours of use, and your rate per kWh. Calculate per-appliance cost to find your biggest energy consumers.

Appliance Wattage (W)

Hours Used / Day

Price per kWh

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How to Use This Tool

Enter the appliance's wattageCheck the nameplate or product spec

Enter daily hours of use and your rateUse your actual electricity rate per kWh

See daily and monthly costIdentify your biggest energy consumers

Electricity Bill Calculator is a free online tool that works entirely in your browser — no signup, no data uploaded, no limits.

Finding Your Real Energy Costs, One Appliance at a Time

An electricity bill shows one total number, but breaking it down per appliance using actual wattage and usage hours reveals which specific devices actually drive that total -- often revealing surprises, like a space heater contributing far more than expected, or a constantly-running device contributing less than assumed.

Wattage and Hours Both Matter Together

A high-wattage device used briefly might cost less than a modest-wattage device left running for many hours daily. Neither number alone tells the full story -- the combination of both, multiplied by your actual rate, gives the real cost picture for any specific appliance.

Using This to Prioritize Energy Savings

Running several appliances through this calculator with their actual specifications highlights where energy-saving effort would actually matter most -- focusing on your highest-cost contributors produces more meaningful savings than addressing low-impact devices first.

Frequently Asked Questions

Energy used (kWh) = Wattage / 1000 x Hours of use. Cost = kWh x Price per kWh. This is the standard formula utilities use, and applying it per appliance reveals exactly which devices contribute most to your total bill.

High-wattage appliances used for many hours (like air conditioning or electric water heating) dominate most electricity bills, while low-wattage devices left on constantly (like a router) usually contribute relatively little despite running 24/7 -- both wattage and hours of use matter together.

Check the appliance's nameplate, manual, or product specification page -- wattage is typically listed directly. Some devices show amperage and voltage instead, which multiply together to give wattage (Watts = Amps x Volts).

Check a recent electricity bill, which typically shows the rate per kWh directly, or calculate it by dividing your total bill amount by your total kWh usage shown on that same bill.

Yes, calculating each appliance's individual cost using its actual wattage and your typical hours of use lets you compare running costs directly -- useful when deciding between two options or estimating the cost impact of adding a new appliance.