Ceiling light layout estimator

Recessed Light Spacing Calculator

Estimate recessed light count, fixture spacing, row spacing, and rough fixture cost from room dimensions and target square footage per light.

Units

Room length (ft)Room width (ft)Target area per light (ft²)Cost per fixture ($)

Lights in layout

Length spacing

Row spacing

Rough cost

Electrical layout needs code and lighting checks

This is a spacing planner, not electrical design. Confirm IC rating, insulation clearance, dimmers, circuit load, fixture lumens, beam angle, ceiling height, wet-location rating, and local electrical code.

Android App

Need recessed light spacing layouts hands-free?

Use the Android app when you need voice input, offline use, material lists, or PDF export. Free, no ads, no accounts.

Get the Free App Free. Built for Android phones. Donations welcome.

Saved you a mistake? Support VibeCalc

Drywall Calculator

Estimate board area and sheet counts.

Paint Calculator

Estimate primer and finish paint gallons.

Shower Tile Calculator

Estimate shower wall and floor tile boxes from wall length, openings, and waste.

Flooring Calculator

Estimate boxes and waste for floor material.

View all

Recessed light spacing formula

Room area = length × width

Target lights = area ÷ area per light

Rows and columns are rounded into a balanced grid

Spacing = room dimension ÷ number of lights in that direction

Sample takeoff

A 12 ft by 16 ft room at 36 ft² per light gives about six lights. A balanced 2 by 3 layout spaces lights roughly 5.3 ft along the length and 6 ft between rows.A 3.6 m by 4.8 m room at 3.3 m² per light gives about six lights in a balanced grid.

Recessed Light Spacing Calculator FAQ

How does this recessed light spacing calculator work?+

It multiplies measured job dimensions by the coverage, spacing, or package yield you enter, adds waste, then rounds the buy quantity up. The calculator creates a first-pass grid from room area. Lumens and electrical constraints decide the final layout.It multiplies measured job dimensions by the coverage, spacing, or package yield you enter, adds waste, then rounds the buy quantity up. The calculator creates a first-pass grid from room area. Lumens and electrical constraints decide the final layout.

Should I use the default waste value?+

Use the default for a quick planning estimate, then raise it for cuts, odd layouts, breakage, bad access, or product-specific loss.Use the default for a quick planning estimate, then raise it for cuts, odd layouts, breakage, bad access, or product-specific loss.

Is this a bid or code approval?+

No. It is a material planning calculator. Verify product data, local code, structural requirements, electrical requirements, and supplier packaging before ordering or building.No. It is a material planning calculator. Verify product data, local code, structural requirements, electrical requirements, and supplier packaging before ordering or building.