Watt Wise: Energy Calculator

Watt Wise is an offline electricity usage and energy planning calculator. It helps you estimate how much electricity your appliances use, calculate approximate electricity costs, and explore basic solar and UPS backup requirements. Add appliances from the built-in catalog or create custom entries using their power ratings and daily operating hours. Watt Wise uses these values to calculate estimated energy consumption. Electricity Usage and Bill Estimates - Calculate estimated energy consumption in kilowatt-hours (kWh). - View daily and monthly usage estimates. - Enter your electricity rate per unit. - Include a percentage for additional charges. - View estimated costs for individual appliances. - Identify appliances contributing most to your calculated consumption. Appliance Catalog Browse common household and workplace appliances organized into categories such as cooling and heating, kitchen, laundry, lighting, electronics, computers, and electrical tools. Select an appliance and adjust its wattage, quantity, operating hours, and load percentage. You can also create, edit, or remove custom appliance entries. Solar Planning Estimates Explore approximate solar panel capacity based on your calculated electricity usage and selected daily sunlight hours. The solar calculator provides an indicative system size and an estimated panel count using simplified assumptions. UPS and Battery Backup Estimates Select appliances you want to include in a backup system and enter your preferred backup duration. Watt Wise provides preliminary estimates for inverter capacity and battery requirements, including indicative lead-acid and lithium battery capacities. You can compare calculations using 12V, 24V, or 48V battery bank settings. Offline Features - Use the app without an internet connection. - Save appliance lists and calculation settings locally. - Adjust electricity rates, currency, and billing days. - Choose System, Light, or Dark theme. - No account registration required. Important Information Watt Wise is an estimation tool, not a live electricity meter or an official utility billing service. Calculated costs may differ from actual bills due to tariff slabs, fixed fees, taxes, and differences in appliance usage. Solar, inverter, and battery results are preliminary planning estimates and are not a substitute for professional electrical system design. Consult a qualified installer before purchasing or installing equipment.