What will my grow light cost?
Grow-light electricity cost calculator
See daily and monthly operating cost for your fixtures and schedule.
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How to use this estimate
Choose a wattage preset and two daily schedules. Monthly and annual cost update live — use the difference to decide whether a shorter schedule is worth it.
Common mistakes
- Using list wattage when the fixture draws less on a dimmer
- Forgetting to multiply by fixture count
- Comparing schedules without the same electricity rate
- Treating cost savings as a reason to skip plant rest periods
Assumptions at a glance
Last reviewed with the calculator formula set on 2026-07-23. Estimates stay range-based on purpose.
Key sources and methodology details
- Actual wall-draw wattage for electricity estimates — U.S. Department of Energy / user-supplied fixture rating. Reviewed 2026-07-26. https://www.energy.gov/energysaver/estimating-appliance-and-home-electronic-energy-use
- Utility electricity rate — User-supplied local rate (EIA residential averages for context). Reviewed 2026-07-26. https://www.eia.gov/electricity/monthly/epm_table_grapher.php?t=epmt_5_6_a
Full portfolio methodology: Methodology
Related planners
ScheduleHow long should I run my grow light?Get a practical daily runtime range for your plant type.PlacementHow high should I hang my grow light?See which hanging height fits your plants best.SchedulePlan lighting for seedlings and herbsBuild a grow-light schedule aimed at seedlings or culinary herbs.
