Arc & Arch Layout Calculator vs Ruler ▸

Arc & Arch Layout Calculator is the precision toolkit every carpenter, joiner, mason, stonemason, builder and DIY enthusiast needs to lay out perfect arches and curves on any job — without complex trigonometry and without ever pulling string from a nail. TWO PROFESSIONAL CALCULATORS IN ONE APP Large Arc Layout Set out a large-radius arc inside any confined space — an opening, a wall, a panel or a curved trim run. Enter the chord width plus either the rise (height) or radius and instantly see: • Sweep angle, arc length, slice and full-circle area • Inside arc mark-out — heights every increment from chord centre out • Outside arc mark-out with optional outer offset • An interactive set-out diagram you can pinch to zoom and drag to pan • A printable template with automatic A4, Letter, A3, A2 and A1 page-fit guidance • A bonus calculator that derives width, height, length and area from radius and sweep angle Gothic Arch Layout Design true masonry arches with mathematical precision. Choose equilateral, lancet or drop arches — the app classifies them automatically — and instantly receive every dimension you need: • Inner and outer radius, inner and outer height • Triangle chord and triangle drop for the gothic set-out • Intrados and extrados arc lengths • Setout mark-out heights from centre out • Voussoirs: full unit count per side, inner and outer arc per voussoir, plus a dedicated keystone diagram • Optional full-scale keystone and voussoir templates ready to print EVERY MEASUREMENT, METRIC OR IMPERIAL Every input switches instantly between Metric (mm) and Imperial (feet, inches and 1/16 to 15/16 fractions). Imperial inputs use clean three-wheel pickers — feet, inches, fraction — so a 6 ft 3 1/2 in chord takes seconds. INTERACTIVE DIAGRAMS YOU CAN ACTUALLY READ Every calculation is paired with a crisp, vector-quality diagram. Pinch to zoom, drag to pan, double-tap to fit, and use the live measure tool to read distances off the drawing. EXPORT TO PDF FOR THE WORKSHOP One tap exports a complete multi-page PDF: a tidy summary page with all your inputs and results, followed by every diagram on its own page — perfect for printing the template at full scale or sharing with the team. NATIVE iOS DESIGN • Built with SwiftUI for iPhone and iPad • Works completely offline • Saves your last inputs automatically • No accounts, no subscriptions, no ads • Respects Dynamic Type and Dark Mode Stop guessing. Calculate, lay out, print and build — accurately, every time.

Five measuring tools in one app. • Free — no subscription, no trial, no paywall • No ads and no account • Works offline, even in airplane mode • Nothing you measure ever leaves your phone ON-SCREEN RULER A real scale on your screen, in millimeters or in inches marked like a tape measure down to 1/32". Zero sits at the very edge of the glass, so you can butt the object straight against the phone. Drag the caliper and read the number on the line itself. Turn the phone sideways for the full length of the screen, and the numbers turn to stay readable. Full screen clears everything else away. CALIBRATION IN 30 SECONDS The ruler is accurate as it comes. If you want it exact, lay a bank card, a 1 or 2 euro coin, a US quarter, or anything else whose length you know on the glass and match the scale to it. It is an offer, never a wall in front of the app, and there is no limit on how far you can adjust it. PHOTO MEASURE Measure anything in a photograph. Put something of a known size beside it — an A4 or US Letter sheet, an access card, a business card, a coin, or your own length — draw the reference line along it, then draw the measured line across what you want to know. Both lines are there from the start and every end can be dragged at any time. A magnifier follows your finger above it, never under it, so a point lands where you meant it. Take a new photo or use one you already have. If the photo was taken from an angle, or the reference is far from the measurement, the app tells you instead of quietly handing you a wrong number. BUBBLE LEVEL A spirit level that is two instruments in one: a tube when you hold the phone against something upright, a round glass when you lay it flat, with the angle in degrees. Set any surface as zero and measure from it. The phone gives one short pulse the moment something is exactly level. Hold freezes the tool, and a reading can be held on screen behind a big button you can drag anywhere and make bigger with two fingers, for measuring where the screen cannot be seen. AR QUICK MEASURE Measure across a room with the camera. Aim the crosshair, press once, aim again: one distance, or a chain of them along a floor, a table or a wall, with the total as you go. It uses the depth sensor where your iPhone has one and detected surfaces where it does not, and when it is not sure of a point it says so instead of showing a number it does not believe. AR ROOM PLAN Walk the corners of a room and get its walls, its perimeter and its floor area. The plan draws itself in the corner of the screen as you walk, and it comes out as a real drawing with every wall measured, a scale bar and a north arrow. SAVED MEASUREMENTS AND PDF EXPORT Save anything you measure, name it, and keep it in folders. A ruler measurement opens back on the ruler, a photo measurement back on its photo, a room as its plan. Export through the normal share sheet as a clean A4 PDF: a table of names, measurements, tools and dates, photo measurements drawn on the photograph with each length beside its line, and a room drawn as a plan a builder can read. No watermark, and screenshots are never blocked. UNITS AND LANGUAGES Centimeters, fractional inches the way a tape is marked (3 3/8"), or decimal inches, climbing to meters or to feet and inches on their own. Units start from your region and are yours to change. 38 languages, right to left included, and a dark theme that follows your phone. PRIVATE BY DESIGN No account, no sign-up, no tracking, no network. The camera and the motion sensor are asked for only when you open the tool that needs them, and a refusal costs you that one tool, never the app. The camera measures and records nothing. WHY IT IS FREE Measuring apps turned into weekly subscriptions with ads over the ruler. This one is free, has no ads, and has nothing behind a paywall.