Lighting estimates help with early planning for living rooms, bedrooms, studies and kitchens. They convert area and target brightness into a total lumen target.

Formula

Total target lumens equal room area multiplied by target lux. Lamp count equals total lumens divided by lumens per lamp, rounded up.

Limits

Beam angle, shades, wall color, ceiling height, glare and task lighting affect real experience. Final layout should consider fixture placement and room use.

How to Use

Enter room dimensions, material specifications and waste allowance.
Review the main result, such as area, pieces, rolls, liters or lamp count.
Compare the result with product packaging, contractor quotes and actual measurements.

Example

Example: calculate base area from room dimensions, add waste, then convert the purchase area into pieces, rolls or liters using product specifications.

Formula and Data

The tool uses basic formulas for area, perimeter, coverage, waste percentage and rounding up. Real material use depends on installation method and site conditions.

Use Limits

Useful for early renovation budgeting and purchase checks.
Not a replacement for on-site measurement, construction drawings or professional quotes.
Irregular rooms and special layouts need a larger waste allowance.

Guides

Renovation Material Estimation Guide

Renovation estimates work best when room dimensions, material specifications, waste and packaging units are reviewed together.

Read guide

FAQ

How should I choose target lux?

Relaxing areas can be lower, while reading and kitchen tasks usually need higher levels.

Are lumens the same as watts?

No. Lumens measure light output; watts measure power use.