๐ Household
Light Bulb Savings Calculator
Efficiency upgrades pay for themselves at different speeds depending on how long the light stays on. A bulb that runs eight hours a day pays back its price in a few months; one used for twenty minutes a day may take years.
How it works
Current bulb wattage
New bulb wattage
Hours used per day
Electricity rate
Price of new bulb
Wattage saved
Energy saved per year
Money saved per year
Payback period (months)
Frequently asked questions
How do I use the Light Bulb Savings Calculator?
Fill in the fields above โ the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.