Visual Interior Tool
Truly freeFree quick room lumen calculator
Free tier & pricing
Completely free web lumen-method calculator for a rectangular room; gives average illuminance and fixture spacing only, not full point-by-point analysis.
Last verified Jun 23, 2026. Report a change →
The short answer
Browser tool that performs lumen-method calculations for a rectangular room to estimate fixture quantity, spacing and illuminance. No install or login.
The facts
- Pricing
- Free · Truly free
- Free tier
- Yes
- Runs in browser
- Yes
- Platforms
- Web
- 2D / 3D
- No 3D
- Learning curve
- Moderate
- Export formats
- —
The catch
- Browser only — no offline app.
- Designs only with this brand’s own catalog.
Best for
Quick interior fixture-count estimates
Head-to-head comparisons
Visual Interior Tool: questions, answered
Is Visual Interior Tool free?
Yes. Visual Interior Tool is genuinely free to use. Completely free web lumen-method calculator for a rectangular room; gives average illuminance and fixture spacing only, not full point-by-point analysis.
What platforms does Visual Interior Tool run on?
Visual Interior Tool is available on Web. It runs in any web browser with nothing to install.
Is Visual Interior Tool easy to learn?
Moderate to pick up. Quick interior fixture-count estimates