How much does it cost to run an incandescent bulb?
About $1.66 a month on the typical usage below, at the U.S. average $0.1816/kWh. Set your own rate and usage and the figure updates instantly.
An old incandescent burns ~60W for the same light an LED makes at 9W — switch them out.
Running an incandescent bulb at 60W for 5 h a day costs about
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An incandescent bulb is cheap to run one at a time — 60 watts for five hours a day is only a few dollars a year — which is exactly why nobody bothered replacing them for decades. The math only turns ugly when you count how many are burning in a typical house: a hallway, two lamps, a porch light and a ceiling fixture can add up to 300+ watts of pure heat-and-light, and unlike a space heater you rarely think to turn them all off.
The real cost isn't the bulb, it's the alternative you're not using. An LED making the same light draws about 9 watts instead of 60 — roughly 85% less — so every incandescent socket in the house is a small, silent recurring charge that a $2 bulb swap erases almost instantly. Left in place, it's one of the few electricity costs that's still fully within your control with zero change in behavior required.
What drives the cost of running an incandescent bulb
- Wattage is the whole story: a 60W bulb draws roughly 6-7x more power than an LED equivalent for the same brightness, so the bulb type matters more than how long it's on
- Hours per day compounds fast — a porch light or hallway fixture left on 5+ hours a day adds up over a billing cycle even at 60W
- It's rarely one bulb: most of the cost comes from running several incandescent fixtures in the same house at once, not any single socket
How to cut it
- Swap it for an LED equivalent — same light output at about 9W instead of 60W, roughly an 85% cut with no change in habits
- Reserve remaining incandescents for low-use spots (closets, storage) where the swap cost isn't worth it yet
- Use a dimmer or occupancy sensor in rooms where the bulb gets left on out of habit, not need
- Prioritize the bulbs that run longest each day (porch, kitchen, living room) — swapping those first returns the most savings per dollar spent
Data basis
- Electricity price
- U.S. Energy Information Administration, Electric Power Monthly, Table 5.6.B, June 2026 year to date, released 2026-08-26. Retrieved 2026-09-11. Average residential revenue per kWh. A benchmark average, not a utility tariff — it excludes the fixed charges, tiers, time-of-use windows, taxes and fuel adjustments on a real bill.
- Appliance energy
- A representative running power for an incandescent bulb, compiled from published manufacturer specifications and public appliance-energy guidance, and presented as a typical figure with the usual range shown above. It is not a measurement of your unit, and we do not claim a single primary source for it — the nameplate on your appliance, or an hour with a plug-in energy meter, beats any typical figure we can publish.
- Usage model
- Steady load — 60W for 5 h a day
- International prices
- rounded typical household tariffs for each market, in that market's own currency unless the row says US$ equivalent. These are planning benchmarks with no single primary source; enter the per-kWh price from your own bill for an accurate figure.
- Last reviewed
- 20 August 2026. Next scheduled review 20 February 2027.
- Corrections
- Think a figure is wrong? Tell us at corrections@watt-dollar.com and see our corrections policy.
Common questions
How much does it cost to run an incandescent bulb per month?
On the assumption shown above — 60W for 5 h a day — an incandescent bulb costs about $1.66 a month, or $19.89 a year, at $0.1816/kWh. That price is the U.S. average; set your own rate and usage above and the figure updates.
How is that worked out?
Power drawn while running x hours run per day. At 60W for 5 h a day that is 0.30 kWh a day, which at $0.1816/kWh costs $0.05 a day.
How can I cut the cost of running an incandescent bulb?
Swap it for an LED equivalent — same light output at about 9W instead of 60W, roughly an 85% cut with no change in habits As a worked example: running it 4 h a day instead of 5 h takes it from $19.89 to $15.91 a year, about $3.98 less.
Is it worth replacing a working incandescent bulb before it burns out?
Usually yes. At typical rates, the energy saved by switching to an LED covers the bulb's few-dollar cost within the first several months of use in an average-use fixture, and every hour after that is pure savings — you don't need to wait for it to fail.
Why does a 60W incandescent bulb cost so much more than an LED for the 'same' light?
Incandescents make light by heating a filament until it glows, so most of the 60 watts leaves as heat, not light. An LED produces the same brightness (lumens) using only about 9 watts because almost none of its energy is wasted as heat.