Cost to Run an LED Light Bulb Calculator

Estimate how much it costs to run an LED light bulb based on wattage, daily usage, and your electricity rate. A common baseline is 10 watts for 5 hours per day.

Fast estimate No signup Updated for 2026 rates

Typical electricity cost

How much does an LED Light Bulb cost to run?

Based on typical usage

An LED Light Bulb typically uses about 10 watts, costing around $0.00 per hour at $0.15 per kWh.

At typical use (5 hours per day), that's about $0.22 per month and $2.74 per year.

Per hour $0.00
Daily $0.01
Monthly $0.22
Yearly $2.74

Based on

  • 10 watts
  • 5 hours per day
  • $0.15 per kWh

What affects cost most

  • Average hours used per day
  • Electricity rate in dollars per kWh
  • Accessory load, operating schedule, and duty cycle

How it works: Daily cost uses wattage, hours per day, and electricity rate. Monthly uses daily × 30; yearly uses daily × 365.

Use the calculator below to estimate cost based on your own wattage, usage time, and electricity rate.

Calculator

1. Device

2. Usage

Quick presets

3. Rate

Enter your values and click Calculate Cost.

How Much Electricity Does an LED Light Bulb Use?

These example monthly costs show how daily runtime changes the bill at a typical electricity rate.

Example monthly costs

  • Light Use 3 hours per day
    $0.13/month
  • Typical Use 5 hours per day
    $0.22/month
  • Heavy Use 7 hours per day
    $0.32/month

Get a better estimate and keep costs down

Defaults are a starting point. Real cost changes most when runtime, wattage, and your electricity rate differ from the benchmark assumptions.

What changes cost most

  • Average hours used per day
  • Electricity rate in dollars per kWh
  • Accessory load, operating schedule, and duty cycle

How to get a better estimate and lower cost

  • Replace the default electricity rate with the actual rate from your latest power bill.
  • Adjust daily runtime to match how long you actually use the equipment.
  • Turn off lights in empty rooms.
  • Use lower-lumen bulbs where full brightness is unnecessary.
  • Add timers or smart controls for repetitive schedules.
  • Replace older decorative bulbs with efficient LED versions.

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