Everyday Life Calculators

Lighting Cost Calculator

Estimate the monthly and yearly electricity cost of running a group of light bulbs.

kWh per day —

Cost per month —

Cost per year —

About the Lighting Cost Calculator

Lighting is one of the easiest household costs to estimate, since the total wattage of a group of bulbs and how long they run each day directly determine the electricity used.

Formula: Cost = ((Bulb Count × Watts per Bulb) × Hours per Day ÷ 1000) × Price per kWh

Use this to estimate the cost of lighting a whole room or house, and compare how much switching to lower-wattage bulbs would save each month.