Stair Lighting Calculator

Stair Lighting Calculator
Riser lights, wall sconces, handrail strip, and downlights — with placement logic and safe spacing.
Staircase dimensions
Including top and bottom step
Typical: 7–7.75 in
Nosing to nosing
Stair configuration
Open or closed?
Indoor / outdoor?
Wall access?
⚠ Non-standard stair geometry detected. Winder and spiral stairs have variable tread widths — fixture spacing based on step count alone can give misleading results. Use the spacing guidance below as a starting point, but verify placement on-site. Each winder/spiral staircase is unique.
Lighting choices
Stair geometry
–
Total run
–
Total rise
–
Slope angle
–
Stair surface area
Side elevation — fixture placement
Riser / step light Wall sconce Handrail LED strip Ceiling downlight
Recommended layout
–
Fixtures needed
– lm
Lumens per fixture
– lm
Total lumens
– W
Watts per fixture
– W
Total load
–
Fixture spacing
Safety & glare guidance
Night mode
–
Design guidance only. This calculator provides lighting design estimates based on standard formulas and your inputs. It does not constitute professional engineering advice and does not certify compliance with any building code, fire regulation, or safety standard. Always verify stair lighting installations with a qualified electrician and check local building regulations before installation.
Scroll to Top

The calculators and tools on LightingCalc.lighting are provided for general guidance and informational purposes only. Results are estimates based on standard formulas and the values you enter — they do not constitute professional engineering, electrical, or architectural advice. Always verify calculations with a qualified professional before making decisions for any safety-critical, code-compliance, or commercial application. LightingCalc.lighting makes no representations or warranties as to the accuracy or completeness of any result, and accepts no liability for errors, omissions, or any outcomes arising from reliance on this information.