Construction tools

m²↔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 Pitch Calculator

Calculate effective length from total length and edge offsets, then convert between bar count and spacing. Includes equal/centered/flush layout rules, coordinate list, CSV/JSON/SVG export, and shareable URLs.

Right-Angle Layout Helper (Pythagorean + Diagonal Check)

Calculate a reference diagonal from side lengths or 3-4-5, then judge measured diagonals against tolerance. Includes recommended 3k/4k/5k values, bulk paste, and judgement table copy.

Anchor Bolt Layout

Calculate effective length from total length and left/right offsets, then convert between count and spacing. Includes equal/centered/flush layout rules, schematic drawing, 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 required tile count, edge cut widths, and waste rate from room and material dimensions. Compare options for minimum 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.

Voltage Drop Calculator (Quick)

Quickly calculate voltage drop (V/%) from voltage, current, one-way distance, and conductor conditions. Compare against an allowable threshold and review cable-size candidates when a standard set is selected.

Roof Area Calculator with Pitch

Calculate sloped roof area from plan dimensions and pitch (degrees/Rise:Run/%/sun). Includes overhang, section split 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/OD/ID/thickness by standard set. Keep source, standard name, and edition visible at all times, and print in A4 or Letter.

Concrete Truck Load Calculator

Add up rectangular, trapezoid, circular, and cylindrical concrete volumes, apply waste %, 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 based on site temperature. Supports C/F switching, proposal-ready PDF export, and shareable URLs.

Tolerance Checker

Judge measurements against target+/-tol or upper/lower criteria with automatic reason output. Supports column-fixed mm/m units, batch CSV checks, and result CSV export.

Trình tạo bản nháp thông số và dự toán sơn

Nhập diện tích, nền, mức xuống cấp, độ bền mục tiêu và độ bóng hoàn thiện để tạo bản nháp thông số sơn với hạng mục công việc, chuẩn bị nền, các bước sơn phủ, phần loại trừ và số lượng ước tính cho báo giá.

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 the surface temperature. Supports metric and imperial inputs, planned-time notes, share links, and browser-only processing.

Paint Defect Wizard

Diagnose coating defects by combining the visible symptom with temperature, humidity, dew-point spread, substrate moisture, surface contamination, and application conditions.

Paint Surface Area Calculator

Calculate paintable area for walls, roof pitch, 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

Enter country or region, coating category, and VOC value to get applicable regulations, limits, and label notes. Built-in packs cover EPA architectural coatings and EU/EEA decorative paints and varnishes.

WFT/DFT Coating Coverage Calculator

Back-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 microns/mils support.