diy-tools

A curated list of free construction, landscaping, and home improvement calculators. Estimate materials, quantities, and costs for concrete, mulch, roofing, paint, tile, fencing, insulation, and more.

Free home renovation tools: paint & tile calculators, room planner, document generators and design resources for DIY | Darmowe kalkulatory remontowe, planer pomieszczeń i generatory dokumentów

Free candle fragrance load calculator: enter vessel volume, pick your wax and load %, and get exact wax and fragrance-oil weights per candle and per batch.

Rebar pieces, laps, weight and cost for slabs, footings and walls.

Free board foot calculator: enter board dimensions, get board feet, linear and square feet, plus waste-adjusted buy quantity and project cost. Quarter-system picker included.

Epoxy kits for your garage floor: primer, coats, flakes and cost.

Mortar mix calculator: bags needed from your brick or block count, N/S/M type picker, waste slider, and sand-cement site-mix breakdown.

Free lye calculator for cold process soap making: enter your oils, pick a superfat, and get exact NaOH and water weights. Recipe builder, batch scaler, and bar yield.

Fence gate cut list, diagonal brace angle and hardware for a sag-free gate.

Free yarn calculator: pick a project or use the gauge-swatch method to get exact yardage, then convert to skeins (with safety skein). For crochet and knitting.

Retaining wall blocks, cap, base stone, backfill and drainage in one estimate.

Stud spacing layout calculator: every stud position from the corner for 16 or 24 in spacing, visual strip, and king/cripple stud notes. Free tool.

Mix custom paint colors by ratio — exact amounts, batch scaling and a recipe log.

Board feet calculator: instant bd ft math, project totals, weight and cost estimates, nominal-vs-actual table and cut-list planner. Free tool.

Caulk tubes needed from joint length and bead size, with waste and cost.

Metric to imperial screw size chart: convert M3–M10 and #4–#14 screws, with thread diameters, pilot-hole drill bits, and head-type guide. Free tool.

Plan, compare costs, and track materials for home renovation projects with reusable lists and project notes.

Turn your phone into a precise spirit level & inclinometer. Free Android & iOS app by lapnito.cz s.r.o. using device sensors for accurate angle measurement, surface leveling, and slope detection. Bubble level, plumb level, angle finder & slope meter.

Baseboard linear feet by room with openings deducted, corners counted, waste added.

Shiplap boards for any wall with stagger layout, waste and cutouts.