Lighting Calculator – Lumens and Number of Bulbs per Room

Room Lighting Calculator

By the CalcMundi team · Updated October 22, 2026 · Formulas checked against standard financial math

Enter the room area, pick the type of room and the lumens of the bulb you want to use.

Formula

Lumens needed = recommended lux × area in m² ÷ 0.8. One foot-candle equals 10.76 lux.

Example

A 150 ft² living room at 150 lux needs about 2,613 lumens: 4 bulbs of 800 lumens, or about 32 W of LED in total.

Recommended levels

Bedroom and hallway: about 100 lux
Living room: about 150 lux
Bathroom: about 200 lux
Kitchen: about 300 lux
Home office: about 500 lux

Frequently asked questions

How many lumens is a 60 W bulb?

About 800 lumens. LED bulbs labeled “60 W equivalent” use around 8 to 9 W.

Should I use warm or cool light?

Warm white (2700–3000 K) feels cozy in living areas; neutral or cool white (4000–5000 K) helps in kitchens and offices.

Add this calculator to your website

Free for blogs, real estate agents, brokers and any site. Paste this code where you want the calculator to appear. It adjusts its height on its own.

<iframe src="https://calcmundi.com/embed/lighting-lumens-calculator/" title="Room Lighting Calculator" loading="lazy" style="width:100%;max-width:680px;height:640px;border:0"></iframe><script>addEventListener("message",function(e){if(e.origin==="https://calcmundi.com"&&e.data&&e.data.cmH)document.querySelectorAll("iframe[src^='https://calcmundi.com/embed']").forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.cmH+"px"})})</script><p style="font:13px sans-serif">Calculator by <a href="https://calcmundi.com/lighting-lumens-calculator/">CalcMundi</a></p>

Results are estimates for information only and are not financial, legal or medical advice. Rates, taxes and fees vary — confirm with a professional or your lender.