Free plant tool
Light Calculator
Estimate how much light a spot in your home gets from window direction, distance and conditions — and see which kinds of plants suit it.
Plant Light & Placement Calculator
Estimate the light at your chosen spot and see what plant categories typically thrive there.
Estimates only. Real light varies by window size, obstruction, season, and location.
How to use the Light Calculator
- Pick the window direction nearest to the spot.
- Enter the distance from the window — light drops off quickly as you move back.
- Add details like room brightness, curtains, season and whether you use a grow light.
- Read the estimate and the plant categories that typically suit that light level.
The calculator gives an estimate. For a second opinion, try the shadow test or a free light meter app, both explained in our indoor plant light guide.
Related guides
Free plant tools
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