Aisha K.
Mar 12, 2026
Clean layout and the results update instantly. Exactly what I needed for a quick planning check.
Electrical & Wiring
Commercial Lighting Load Calculator
kWh = fixtures × watts × hours/day × days; amps = total W ÷ voltage.
Estimate monthly kWh and connected amps for commercial lighting. Planning estimates only — verify measurements and local codes on site.
Inputs
11000
5200
124
2031
110277
Smart analysis
Recommendations
Tailored to your live inputs and result—guidance only, not professional advice.
- Round up
Buy a little extra for real-world waste
Measurements are ideal—paint, flooring, and food projects usually need a small overage for cuts, mistakes, and touch-ups.
Scenario studio
Compare A vs B
Capture two sets of inputs on this device, then see which outcome wins. Share either scenario with a link.
Scenario A
Adjust inputs, then capture this slot.
Scenario B
Adjust inputs, then capture this slot.
Plain-English guide
Terms & how it works
Confused by a field? Read the short definitions here while you use the tool.
Fixture count
The “Fixture count” value used in this tool’s formula. Adjust it to see results update live.
Watts per fixture
The “Watts per fixture” value used in this tool’s formula. Adjust it to see results update live.
Hours per day
The “Hours per day” value used in this tool’s formula. Adjust it to see results update live.
Days per month
The “Days per month” value used in this tool’s formula. Adjust it to see results update live.
Voltage (V)
The “Voltage (V)” value used in this tool’s formula. Adjust it to see results update live.
How this calculator works
Estimate monthly kWh and connected amps for commercial lighting. Planning estimates only — verify measurements and local codes on site. kWh = fixtures × watts × hours/day × days; amps = total W ÷ voltage. Example: 40 fixtures × 32 W × 10 hrs × 30 days → ~384 kWh/month.
kWh = fixtures × watts × hours/day × days; amps = total W ÷ voltage.
Example: 40 fixtures × 32 W × 10 hrs × 30 days → ~384 kWh/month.
When to use this Commercial Lighting Load
Common use cases
- Estimate monthly kWh and connected amps for commercial lighting.
- Sanity-check with this case: 40 fixtures × 32 W × 10 hrs × 30 days → ~384 kWh/month.
- The relationship is: kWh = fixtures × watts × hours/day × days; amps = total W ÷ voltage.
Localized examples
- Electrical & Wiring: the example on this page uses the same formula as the widget.
What you get
- Fields: Fixture count, Watts per fixture, Hours per day, Days per month
- kWh = fixtures × watts × hours/day × days; amps = total W ÷ voltage.
- Example on the page: 40 fixtures × 32 W × 10 hrs × 30 days → ~384 kWh/month.
How to Calculate Commercial Lighting Load Step-by-Step
- 1Enter Fixture count, Watts per fixture, Hours per day, then the remaining fields. Use the values you have, not a catalog average, unless that is all you know.
- 2kWh = fixtures × watts × hours/day × days; amps = total W ÷ voltage.
- 3Worked case: 40 fixtures × 32 W × 10 hrs × 30 days → ~384 kWh/month.
- 4Buy materials after you walk the job. This is a first-pass quantity, not a purchase order.
Governing formula
kWh = fixtures × watts × hours/day × days; amps = total W ÷ voltage.
40 fixtures × 32 W × 10 hrs × 30 days → ~384 kWh/month.
Example: set Fixture count = 40, Watts per fixture = 32, Hours per day = 10, then read the result.
Variable definitions
- fixtures
Fixture count
The “Fixture count” field. Default 40; typical range 1–1000.
- wattsPerFixture
Watts per fixture
The “Watts per fixture” field. Default 32; typical range 5–200.
- hoursPerDay
Hours per day
The “Hours per day” field. Default 10; typical range 1–24.
- daysPerMonth
Days per month
The “Days per month” field. Default 30; typical range 20–31.
- voltage
Voltage (V)
The “Voltage (V)” field. Default 120; typical range 110–277.
- The takeoff (kWh = fixtures × watts × hours/day × days; amps = total W ÷ voltage.) ignores waste, code, and what you find when you open the wall. Measure twice on site.
- Nothing here is uploaded for the calculation itself.
Frequently Asked Questions
kWh = fixtures × watts × hours/day × days; amps = total W ÷ voltage.
Related calculators
Electrical & Wiring
- Generator Sizing CalculatorEstimate generator kW from essential load and starting surge.
- Subpanel Load CalculatorTotal load with spare percent → recommended subpanel size.
- Voltage Drop CalculatorCompute voltage drop and percent loss for a circuit run.
- Wire Gauge Ampacity CalculatorSuggest wire gauge for a circuit load and check voltage drop against the 3% guideline.
- Baseboard Heater Sizing CalculatorEstimate linear feet of baseboard from room size and heat loss.
- Conduit Fill CalculatorEstimate conduit fill percent and max wire count at 40% fill.
Get a note when we add a planner
Occasional email when something new is worth opening. We never share your address. Unsubscribe anytime.
Discover & search
Explore More Tools
Related tools in Electrical & Wiring — strengthening topical internal links.
Same category · 3 tools
Browse all →Wire Gauge Ampacity Calculator
Electrical & Wiring
Suggest wire gauge for a circuit load and check voltage drop against the 3% guideline.
Voltage Drop Calculator
Electrical & Wiring
Compute voltage drop and percent loss for a circuit run.
Conduit Fill Calculator
Electrical & Wiring
Estimate conduit fill percent and max wire count at 40% fill.
Community
Reviews & Ratings
See what others think about this tool, then leave your own rating to help improve CalculioHub.
4.8
out of 5.0
4 reviews
Daniel R.
Feb 28, 2026
Very usable on mobile. Would love a save/export option later, but the math feels solid.
Priya S.
Feb 3, 2026
The FAQ section answered my questions before I even had to search. Smooth dark mode too.
Marcus L.
Jan 19, 2026
Simple inputs, clear outputs. This replaced three bookmarks I used to juggle.
Improve this tool
Suggestion Box
Share an idea, report a bug, or send general feedback for Commercial Lighting Load Calculator. Your input helps shape what we build next.