CostMyWatt: Energy Calculator

Make everyday energy costs easier to understand with 16 practical calculators in one focused app.

CostMyWatt helps you estimate:

• Electricity cost from power, runtime, tariff, and usage days
• Appliance and air-conditioner electricity costs
• Refrigerator, water-heater, washing-machine, dryer, and lighting costs
• Standby-power and gaming PC electricity costs
• Complete electricity bills including fixed charges
• EV charging cost and EV electricity cost per kilometre
• Fuel trip cost and cost per passenger
• US MPG, L/100 km, and km/L conversions
• Simple solar payback using self-use and export assumptions

Each calculator explains its inputs, formula, and assumptions. Choose from 30 currencies for familiar result formatting. Currency selection changes formatting only and does not convert values using live exchange rates.

Calculator inputs stay on your device. The initial release uses no account, analytics SDK, advertising SDK, or sensitive device permissions.

Results are planning estimates. Actual consumption, tariffs, fuel use, and solar performance may differ.