The worst part of a DIY reno? Too much tile stacked in the garage, half a can of paint left over, or flooring you have to order twice. Renovation Calc is for homeowners, foremen, and small crews who want numbers before hitting the store. Enter room length, width, and height—we deduct doors and windows, add waste, and spit out quantities you can actually buy. Basics (what you’ll use most) · Tile: net area, piece count, boxes—tile size and pieces per box are yours to set · Paint: wall + ceiling area, primer, topcoat, putty buckets · Flooring: install area with waste, rough budget in mind Finish & trades (the stuff you forget until you’re on site) · Grout, wallpaper, waterproofing, baseboard · Mortar, masonry/plaster, gypsum ceiling · Tile adhesive, grout fill, crown moulding, threshold & window sill stone Plumbing & electrical · Wire & conduit: circuits, wire length, boxes · Switches & outlets: point count for a shopping list · PPR pipes: hot/cold runs, elbows, tees Whole-home summary · Add living room, bedroom, bath—calculate each separately · Auto-combine materials across rooms · Export a purchase list or share a report (text or image on device) Why it’s handy · Works fully offline—bad signal on site, no problem · History saved on your phone; pull up old runs anytime · Dark mode · English / 中文 · no account needed; data stays on your device Who it’s for Anyone who’d rather tap a few numbers than guess at the lumber yard. Disclaimer · Estimates for shopping only—not professional estimating or construction documents · Deductions and waste rates are rules of thumb; leave margin and verify on site · All data stays on your device; we don’t upload your room sizes · You’re responsible for purchase decisions based on these numbers