Electricity Bill Calculator

How Your Electricity Bill is Calculated

Your electricity bill is the sum of energy consumed by all appliances, multiplied by your utility's tariff rate. The unit of energy on your bill is the kilowatt-hour (kWh), which equals using 1,000 watts for one hour.

The Formula

Energy (kWh) = Power (W) × Hours Used / 1000 Cost = Energy (kWh) × Tariff (cost per kWh)

How to Use This Calculator

Enter each appliance's power rating (in watts), average daily usage (hours), and the number of days. Add your electricity tariff (from your bill). The calculator totals the monthly and annual cost.

Practical Examples

Example 1: Air conditioner at 1,500W running 8 hours/day for 30 days at $0.15/kWh. Energy = 1.5 × 8 × 30 = 360 kWh. Cost = 360 × 0.15 = $54/month.

Example 2: LED bulb at 10W running 5 hours/day for 30 days at $0.15/kWh. Energy = 0.01 × 5 × 30 = 1.5 kWh. Cost = $0.23/month — 8× cheaper than a 80W incandescent.

Tips to Reduce Your Electricity Bill

• Replace incandescent and halogen bulbs with LEDs (80% energy savings).
• Run dishwashers and washing machines at off-peak hours if time-of-use tariffs apply.
• Use power strips to eliminate standby power ("vampire draw") from electronics.
• Set air conditioners to 24–26°C — each degree lower increases consumption ~8%.
• Choose Energy Star–rated appliances when replacing old equipment.