Estimate an appliance's use
Turn watts, hours, days, and quantity into kWh. Enter your own rate if you want an estimated energy charge.
Open tool ↗A household electricity literacy lab · Vijeron
Understand household electricity with numbers you can check
Power labels, bills, and product ads often use different units. Everyday Energy connects them with open formulas, examples you can recalculate, and visible limits on every estimate.
100 W× 10 h= 1 kWh
01 / METHOD
Three steps you can check
01
Read a label or meter and record where the number came from.
02
Enter hours and days that match your own use.
03
Compare the estimate with billed kWh over a matching period.
02 / TOOLS
Two tools with open formulas
Calculations run in your browser. Your inputs are not sent to our server.
Compare two options
See the kWh difference between two appliances on the same schedule. Useful for lamps with comparable light output.
Open tool ↗03 / READ
Guides from first principles to decisions
Ten short readings form a learning path. Each page includes a worked example, a common pitfall, and links to primary sources.
Watts and kWh: power is different from energy
Understand the difference between the number on an appliance label and the number on your electricity meter.
Read guideReading an appliance power label accurately
Find the relevant input rating and see why a label is not the same as a real-world energy measurement.
Read guideTurn operating hours into monthly kWh
Build an estimate you can check: watts, hours per day, days of use, then kWh.
Read guideRead your electricity bill before comparing costs
Separate energy, billing period, rate, and other charges for a fairer comparison.
Read guideStandby power: small each hour, long in use
Estimate the energy drawn by devices that stay connected while they are not in active use.
Read guideCompare lamps that provide similar light
Use lumens for the light you need and watts for energy; watts alone are not a fair comparison.
Read guideWhy a refrigerator or air conditioner is hard to estimate from its label
Understand cycling and variable power before treating a simple watt-hour estimate as a bill prediction.
Read guideA one-sheet home electricity audit
Build a small record you can improve over time instead of guessing which device caused a bill.
Read guideChoose energy-saving steps using your own data
Prioritize changes you can test, then see whether your actual daily kWh changes.
Read guideCheck an 'energy-saving' product claim
Ask a few concrete questions before relying on a percentage without a clear baseline.
Read guideWritten for Vijeron; sources verify concepts rather than supply copied articles.
Method & sources ↗