WattwiseHome energy, made clear
CurrencyUSDChoose location

Start with your location

Regional settings

Currency for your estimateUSD — US dollarSet automatically from Choose location.

Your location gives the calculator sensible defaults. Only change an extra setting when it differs from your actual bill.

Not saved yet
Start calculatingSaved locally
Understand your inputs

Clear guides for a less confusing electricity bill.

Practical examples of appliance wattage, kWh, electricity bills, tariff slabs, and choosing the right calculator input.

01Measurement guide

How to find an appliance’s real wattage

Use the label, energy guide, manual, or a plug-in meter—and know when each source can mislead you.

Includes a marked AC label example6 min read02Electricity basics

Watts, kilowatts, and kWh—without the jargon

Power is the speed of energy use; kWh is the amount you pay for. Here is how to move between them confidently.

5 min read03Tariff guide

How tiered electricity tariffs change appliance cost

Understand slabs, marginal rates, fixed charges, subsidies, and why your last unit can cost more than your first.

8 min read04Bill-reading guide

Which electricity price belongs in the calculator?

Find the per-kWh charge on your bill, separate account fees, and handle slabs or peak-hour prices without guessing.

7 min read