About HomeWattly

HomeWattly is a free online electricity cost calculator designed to help you understand how much your appliances and devices cost to run.

What We Offer

Our calculator allows you to:

  • Calculate electricity costs based on appliance wattage, usage hours, and your electricity rate
  • See daily, monthly, and annual cost projections
  • Understand total energy consumption in kilowatt-hours (kWh)
  • Learn the formulas behind electricity cost calculations
  • Access the tool from any device - desktop, tablet, or smartphone

Our Approach

We believe in transparency and education. Our calculator:

  • Is completely free - No subscriptions, no hidden fees, no paid features
  • Protects your privacy - All calculations happen in your browser. We don't collect or store your usage data
  • Shows the math - We explain the formulas so you understand how costs are calculated
  • Provides realistic estimates - We clearly mark appliance presets as typical values that you should verify against your own devices

Why We Built This

Understanding electricity costs shouldn't require complex calculations or paid tools. We created HomeWattly to make it easy for anyone to:

  • Estimate how much an appliance costs to run before purchasing it
  • Identify which devices consume the most electricity in their home
  • Understand the relationship between watts, hours of use, and actual costs
  • Make informed decisions about electricity usage

Important Note: All calculations provided by HomeWattly are estimates. Actual costs may vary based on your specific appliances, usage patterns, and electricity provider rates. Always verify important calculations with your utility provider.

The Tool is Free and Open

HomeWattly is a static website built with standard web technologies (HTML, CSS, JavaScript). There are no accounts to create, no data to sync, and no external services required. Everything runs directly in your web browser.

Accuracy and Limitations

Our calculator provides accurate mathematical calculations based on the values you enter. However:

  • Power consumption can vary between different models of the same appliance
  • Many appliances don't run at constant power (e.g., refrigerators cycle on and off)
  • Electricity rates may include taxes, fees, and tiered pricing not reflected in a single per-kWh rate
  • Seasonal factors and time-of-use rates can affect actual costs

Use our calculator as a helpful estimation tool, not as a replacement for actual utility bill data.

How to Contact Us

Have questions, suggestions, or feedback? Visit our contact page to get in touch.