Even Spacing Calculator vs Hole Spacing & Bolt Pattern

Plug in measurements, get perfect spacing instantly. Fractions or decimals, imperial or metric, on-center or edge. No ads, no tracking. Built by a woodworker. Ever spent way too long doing mental math, only to end up with uneven gaps anyway? Yeah, that's frustrating. Even Spacing Calculator takes the guesswork out of evenly distributing pieces across any length. Whether you're installing deck balusters, spacing recessed lights, hanging wall art, laying out a gallery wall, running conduit, building a fence, or arranging bookshelves... just plug in your numbers and get precise measurements instantly. WHY YOU'LL ACTUALLY USE THIS: Solve It Your Way Know your pieces but need the gap? Or know your ideal gap and need to figure out how many pieces fit? The app works both directions. Plus, min/max gap range calculations help you find the sweet spot when you've got flexibility to work with. Flexible Layouts Set the number of pieces, enter your total length, and let the app handle the math. Works for projects big and small. Units That Make Sense Switch between metric and imperial whenever you want. Imperial users get accuracy down to 1/64" for when precision actually matters. Center or Edge Placement Choose how you want pieces distributed, with accurate on-center measurements so you know exactly where to mark. Fractions or Decimals Input measurements the way you already think about them. No conversions needed. Save Your Projects Building a deck today and a fence next week? Save each layout as a named project and pull it up instantly. Your measurements stay with you. Print or Share Print a clean summary on any AirPrint printer, or share it through Messages, Mail, or Notes. No Ads. No Tracking. Just a tool that does its job without interruptions or creepy data collection. Built by a woodworker for anyone who's tired of measuring twice, calculating wrong, and cutting once anyway.

Plan, mark, and drill perfectly placed holes in seconds. Hole Spacing & Bolt Pattern is the professional layout calculator for engineers, machinists, woodworkers, metal fabricators, and serious DIY makers who need exact hole centres and drill templates every time. Whether you are laying out a flange, designing a CNC job, building a drilling jig, or marking a mounting plate, this app gives you precise numbers and a clean scaled diagram — right on the workshop floor or in the field. FOUR POWERFUL CALCULATORS • Single Row — Space any number of equal holes along a piece. Use equal end gaps or set first and last gap independently. Supports length, width, hole diameter, centre offset, and corner radius. • Variable Diameter Row — Lay out a row of different-size holes. Choose top, middle, or bottom alignment and get every gap, centre, and edge position automatically. • Rectangular Grid — Generate rectangular or staggered (diagonal-offset) drilling patterns with border margins, corner radii, and custom hole counts across and down. • Circular & Oval — Build PCD (pitch circle) and oval hole layouts with multiple rings. Even spacing, custom inner and outer margins, custom holes-per-ring, and golden-ratio oval support. DESIGNED FOR PROFESSIONALS • Metric (mm) and Imperial inches; decimal or fractional entry (e.g. 5 1/2") • Hole shapes: round, square, triangle, pentagon, hexagon, heptagon, octagon, star • Dot, cross, number, or diameter centre marks • Live interactive diagrams — pinch to zoom, drag to pan • Running points to hole centres and hole edges, ready to transfer to a ruler or tape • Optional wood or metal material preview • Bounding-circle display for non-round shapes • Full dark mode, iPhone, and iPad support SHARE AND DOCUMENT Every calculation exports as a clean multi-page PDF containing all input parameters, output values, running-point lists, and a scaled diagram — perfect for shop drawings, client approvals, and project records. Share via AirDrop, Mail, Messages, Files, or print directly. BUILT FOR ACCURACY Every engine is carefully ported from the trusted web formulas that engineers already rely on, with validated math, tolerance-aware checks, and clear error messages when a layout will not fit the piece. Stop guessing hole positions. Stop redoing layouts because a gap is off. Download Hole Spacing & Bolt Pattern and get your drilling, fabrication, and layout work right the first time.