Home Energy Bill Calculator
Break your monthly electricity bill down by appliance -- AC, water heating, fridge, laundry, lighting, electronics and EV charging -- and see exactly where your biggest costs come from.
Monthly Appliance Usage:
Disclaimer. Energy usage estimates use typical appliance power ratings and are only as accurate as the hours and wattages you enter; actual bills vary by appliance efficiency, climate, tariff structure and utility fees not modeled here. Read full disclaimer →
About Home Energy Audit
A home energy audit identifies where you are losing energy and where improvements give the best return on investment. Typical home energy breakdown: air conditioning and heating 35-45%, water heating 15-20%, lighting 10-15%, appliances 15-25%, standby power 5-10%. Air conditioning is the biggest opportunity since a 5-star BEE-rated inverter AC uses 30-50% less electricity than a 2-star non-inverter model.
Quick wins with good payback: replace old lights with LEDs (90% energy savings); install a 5-star inverter AC; add ceiling fans allowing the AC thermostat to be set 4 degrees higher saving 16-20% on cooling; seal air leaks around doors and windows; set water heater to 48 degrees instead of 60 degrees; install a solar water heater replacing 80% of water heating electricity. Every 1 degree increase in AC thermostat setting saves approximately 6% on cooling energy bills.
Formula Used In This Calculator
Each appliance's monthly kWh is estimated from typical power draw: AC/Heating = hours/day × power (kW) × 30 days; Water Heater = hours/day × 3 kW (assumed) × 30 days; Fridge = power (kW) × 24 hours × 30 days (runs continuously); Washing Machine = loads/week × 4 × 1.2 kWh per load; Lighting = hours/day × 0.04 kW × 10 bulbs (assumed) × 30 days; TV/Electronics = hours/day × 0.1 kW (100W assumed) × 30 days; plus any EV charging kWh entered directly. All components sum to total monthly kWh, multiplied by your electricity rate for your monthly bill, then ×12 for an annual estimate.