Recessed Lighting Calculator

All misc tools

Calculate recessed lighting layout and spacing.

Room Dimensions

Room Length

Room Width

Fixture Grid

Num Rows

Lights Per Row

Layout Blueprint

Total Fixtures Required

Along Length (20')

Between Lights

6.7'

From Walls

3.3'

Along Width (15')

Between Lights

7.5'

From Walls

3.8'

For an 8-foot ceiling, 4-inch or 5-inch fixtures are common. For 10+ foot ceilings, consider 6-inch fixtures for better coverage.

About this calculator

Overview

Recessed lighting calculation determines number and spacing of can lights. Based on room size, ceiling height, and desired brightness. Essential for home renovation and new construction.

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Pro Tips

Spacing = ceiling height ÷ 2 (general rule).
8 ft ceiling: 4 ft spacing typical.
Dimmer switches add flexibility.
LED cans use 75% less energy.

Fun Facts

Formula: Spacing = Ceiling Height / 2; Number = Area / (Spacing²)