Wainscoting & Trim Calculator

Interior Paneling & Trim Layout is the all-in-one layout calculator for finish carpenters, woodworkers, joiners, and serious DIYers who want balanced spacing every time — without the guesswork, wasted material, or trial and error. Enter your measurements, see an instant scaled diagram, and get exact cut sizes, centres, gaps, and running measurements you can mark straight onto the job. SEVEN PRO CALCULATORS IN ONE APP • Wainscoting Design — panel widths, stiles, rails, caps and base, with equal, spread, focus and alternating styles. • Shaker Paneling — flat-panel grids with battens, openings and outlets. • Shaker Stair Paneling — raked panels that follow your staircase angle. • Board & Batten Spacing — equal or exact centres, any end condition, angled runs. • Angled Spacing — single-slope and full-gable layouts for raked walls and ceilings. • Diminishing Lengths — tapered members inside a triangle or gable. • Baluster Spacing — railings, between posts, and stair balusters with a 100 mm gap check. WORKS THE WAY YOU DO • Metric and imperial — type in mm, inches, or feet and inches. • Live, accurate diagrams update as you type. • Clear results: counts, centres, gaps, areas, and running measurements. • Export a clean PDF of your inputs, results, and diagram to share with the crew or client. • 100% offline — no account, no internet, no ads. WHY PROS CHOOSE IT Stop doing layout math on a scrap of plywood. Get even panels, consistent gaps, and clean reveals on the first cut — saving material, time, and callbacks. Whether you are panelling a hallway, building a staircase, or setting out a balustrade, you will have the right numbers in your pocket. Download Interior Paneling & Trim Layout and make every layout fast, accurate, and repeatable.