Foam Board Calculator
Free Tool — Michigan Foam Board
Foam Board Calculator
Enter your floor dimensions and we'll estimate how many sheets of EPS foam board insulation you'll need for your radiant in-floor heating project — fast, simple, free.
With rebar
(Individual weights)
- 31,100 lbs or less → Use 15 PSI
- 31,100–51,840 lbs → Use 25 PSI
Without rebar
(Individual weights)
- 15,550 lbs or less → Use 15 PSI
- 15,550–25,920 lbs → Use 25 PSI
If you have individual weights above 51,840 lbs, have your concrete company or engineer recommend the PSI needed specific to your project.
We add this on top of your raw square footage to cover trim waste and mistakes.
Plan view — floor
Sheets required
0
Coverage area needed
0 sq ft
With waste factor
0 sq ft
Board size
2 in × 4 ft × 24 ft
Pressure rating
15 psi
Frost layer protection
No
Est. R-value (EPS)
R-7.7
Estimate only — actual sheet count can vary with layout, cuts, and project requirements. Each sheet is 2 in thick × 4 ft × 24 ft (96 sq ft). R-value shown uses ~3.85 per inch for standard EPS. Talk to our team to confirm exact quantities for your build.