Complete Lighting Calculator

Calculate fixtures, lumens, and spacing for your recessed lighting project

Apply a common room size, then fine-tune the numbers below.

Calculate the number of lights, spacing, and lumens needed for your room

Measurement System

Imperial (ft/in)

Metric (m/mm)

Room Length (inches or feet)

Room Width (inches or feet)

Experience Level

Homeowner (Recommended defaults)

Professional (Custom values)

Room Type

Ceiling Height (ft)

Sloped / vaulted ceiling

Natural Light

Daylight offsets artificial lighting needs by up to 20%.

Fixture Size