Baluster Calculator

Baluster & Stair Calc — Deck Railing Spacing Calculator
IRC 4 inch sphere code compliance built-in

Baluster & Stair Calc

Perfect baluster spacing, every time. Calculate exact baluster counts, gap sizes, and stair bevel angles for deck railings — wood, iron, or cable — then check code compliance instantly with your built-in AI building inspector.

Level Railing — sample result

Baluster Count45
Actual Gap3.62 in
Center-to-Center5.12 in
Est. Material Cost$186.40
IRC 4 inch Sphere Compliant

Works offline. No account required. Free to use.

Four tools, one railing project

From first measurement to code sign-off, every step of the job lives in one place.

Calculator

Enter rail length, baluster width and max gap — get exact spacing and cost in seconds.

Blueprint

A scaled visual diagram of your railing with dimension lines, ready to export.

AI Inspector

Ask plain-language questions about IRC code, guard height, and pool barrier rules.

Saved Projects

Store every calculation on-device and reload it for the next job.

Built around the IRC 4 inch sphere rule

Guard openings are checked against the International Residential Code's 4-inch sphere requirement automatically — no separate lookup needed.

  • Instant pass/fail against IRC 1015.4 guard openings
  • Works for wood, iron, and cable railing systems
  • Stair pitch & baluster bevel angle calculations
  • AI Inspector for follow-up code questions

Contact

Questions or support: usatopgs@gmail.com

© 2026 Baluster & Stair Calc. Not affiliated with the International Code Council. Always confirm local amendments with your building department.

Comments

Popular posts from this blog

Privacy Policy