1/3
Checks the slab-depth ceiling so unsupported and supported overhangs stay inside the rule.
Offline-first Android tool for stone fabricators
How far can your countertop overhang? Get the verdict and bracket plan.
Type the material, thickness, overhang, slab depth, and run length. OverhangProof returns PASS or ENGINEER-IT, lays out bracket spacing, flags point-load and cutout risk, and exports a signed support certificate.
Works without signal after installNo account or adsOne-time Pro unlock
One counter, one defensible answer
200 lb
Flags seated eating bars with a front-edge point load before the slab is fabricated.
20 in
Solves bracket spacing, count, end setback, and support projection from the run length.
PDF
Exports a signed support certificate with the diagram, assumptions, and PE disclaimer.
Built for field judgment, not blind approval
OverhangProof is an overhang and support planning aid based on Natural Stone Institute consensus limits, the 1/3-of-depth rule, and a 200 lb assumed front-edge load. It is not a substitute for the stone manufacturer's installation requirements or a licensed professional engineer. Verify with a PE for structural cases before fabrication.
Free for two jobs. Pro is a one-time $9.99 unlock for unlimited projects, signed Support Certificates, clean diagram PNG export, and custom presets. Purchases and restore use Google Play Billing. No subscription, no ads, no analytics.