CFL Bulb Energy Savings Calculator

Buying Guide

Use our Energy Savings Calculator to find out how much you will save by switching to ENERGY STAR qualified Compact Fluorescent Light Bulbs. Simply enter the number of lights you will be replacing, your electricity rate (the default is based on the average cost of $0.101 kilowatt/hr), the number of hours per day the lights will be turned on, and some basic information about the Compact Fluorescent Bulbs you will be purchasing, as well as the Incandescent Bulbs you will be replacing. The calculator will automatically update itself based on the values entered.

Number of Lights

Electricity Rate ($/kWh)

Hours Used Per Day

Fluorescent Incandescent
Initial Cost per Light

Wattage (watts)

Annual savings by switching to fluorescents: