About this app
Guessing at baluster spacing wastes material and risks failing inspection. The 4-inch sphere rule sounds simple, but getting even gaps across an odd-length span requires math. This app does it instantly. Enter total span between posts, baluster width, post width, and max allowed gap (IRC 4-inch residential or IBC 6-inch commercial preset). Get the exact number of balusters, actual gap size, on-center spacing, and instant code pass/fail check. Supports deck railings, stair railings, fence sections, and porch guards. IRC R312.1 and IBC compliant gap limits built in. Shows full layout summary with post-to-baluster spacing. KEY FEATURES: - IRC and IBC gap presets - Even spacing calculation - Code compliance check - Works completely offline - No account or login required Built for deck builders, carpenters, general contractors, and home inspectors.
Latest release
What’s New
Added a More Pro Tools section to discover related field calculators.
Audience growth
Ratings growth
Baseline captured. Growth appears after the crawler observes a changed rating count.
Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.
Price tracking
Price intelligence
First snapshot captured. The trend line starts after the next crawler price observation.
- First observed Oct 2, 2026 · 7:51 PM $7.99
Screenshots
