Construction tools
Estimate quantities, dimensions, slopes, layouts, tolerances, and site calculations.
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Construction tools
Tools available: 24m²↔Tsubo↔Tatami↔m↔mm Converter
Convert m², tsubo, tatami, m, and mm with SI-based formulas. Set tatami dimensions for accurate conversion and generate fixed-decimal quick tables.
Rebar Spacing Calculator
Calculate effective length from total length and edge offsets, then convert between bar count and spacing. Includes equal, centered, and one-side flush layouts, coordinate lists, CSV/JSON/SVG export, and shareable URLs.
Right-Angle Layout Helper (Pythagorean + Diagonal Check)
Calculate a reference diagonal from side lengths or a 3-4-5 setup, then judge measured diagonals against tolerance. Includes recommended 3k/4k/5k values, bulk paste, and table-copy tools.
Anchor Bolt Layout
Calculate effective length from total length and left/right offsets, then convert between count and spacing. Compare equal, centered, and flush layouts with a schematic, coordinate table, TSV/CSV export, and shareable URLs.
Slope Grade Calculator
Convert slope values between rise/run, percent, degrees, and 1:n. Includes m/mm and ft/in display switches, downhill handling, one-click copy per result, and shareable links.
Tile & Flooring Layout Calculator
Estimate tile count, edge-cut widths, and waste rate from room and material dimensions. Compare options for low waste, visual balance, and tiny-cut avoidance, then review cut positions in a diagram.
Formwork Area Calculator
Calculate formwork area for columns, beams, walls, and slab edges. Apply opening deduction rules and deduction faces, then confirm net area and multiplier-based reference values.
Scaffolding Area Estimate
Estimate scaffolding area from perimeter, height, and coverage factor, and calculate mesh/protection accessory area with loss in one pass.
Quick voltage drop calculator
Calculate voltage drop (V and %) from voltage, current, one-way distance, and conductor conditions. Compare it with a reference threshold and review cable-size candidates for a selected standard.
Roof Area and Pitch Calculator
Calculate sloped roof area from plan dimensions and pitch (degrees, Rise:Run, %, or sun slope). Includes overhang, section totals, waste rate, share URL, and print output.
Material Loss Calculator
Calculate order quantity from net required amount with Waste% or Yield%, salvage rate, and pack-size rounding. See pre-round need, order count, and leftover for each row.
Paint Quantity Calculator
Enter area, coats, substrate roughness, waste rate, coverage, pack size, and unit price to calculate required L/gal, can count, and estimated cost instantly.
Pipe Dimensions Chart (Nominal ↔ OD / ID)
Compare nominal size, OD, ID, and wall thickness by standard set. Keep the source, standard name, and edition visible, then print in A4 or Letter.
Concrete truck-load calculator
Add rectangular, trapezoid, circular, and cylindrical concrete volumes, apply a waste percentage, and estimate truck loads with round-up logic. Supports m³ and yd³; truck count is an estimate.
Drying and recoat timing planner
Adjust drying, recoat, and masking timings from data-sheet values for the site temperature. Supports °C/°F switching, proposal-ready PDF export, and shareable URLs.
Tolerance Checker
Classify measurements as OK or NG against target ± tolerance or upper/lower criteria, with a reason for each result. Supports fixed mm/m units by column, batch CSV checks, and result CSV export.
Paint Specification and Estimate Builder
Enter the area, substrate, surface condition, target service life, and finish sheen to create a paint specification draft with work items, preparation steps, exclusions, and approximate quantities for a sales proposal.
TDS/SDS Quick Reader
Upload a TDS or SDS PDF and pull out coverage, recoat time, dilution ratio, application temperature, VOC, and precautions in a clean, browser-only view.
Exterior & Interior Color Simulator
Upload a photo to simulate exterior and interior color changes, signage, and UI-style layouts, then check contrast using 4.5:1 for normal text, 3:1 for large text, and 3:1 for UI elements.
Dew point checker
Estimate dew point from air temperature and relative humidity, then judge painting workability from the gap to surface temperature. Supports metric and imperial units, planned-time notes, share links, and browser-only processing.
Paint defect diagnosis wizard
Diagnose coating defects by combining visible symptoms with temperature, humidity, dew-point spread, substrate moisture, surface contamination, and application conditions.
Paint Surface Area Calculator
Calculate paintable areas for walls, pitched roofs, tanks, pipes, steel sections, fences, and direct inputs in one browser-based tool. Pass the net area directly to the Paint Quantity Calculator.
VOC compliance
Check market-specific VOC limits and label notes by entering a country or region, coating category, VOC value, and basis. Built-in packs cover EPA architectural coatings and EU/EEA decorative paints and varnishes.
WFT/DFT Coating Coverage Calculator
Calculate required WFT, theoretical coverage, and actual usage from target DFT, volume solids, loss rate, area, coats, and area share. Built for industrial coating work with micron and mil support.