Construction Calculators
Estimate materials, review building geometry and run standards-based engineering calculations. These tools support planning and checking; project drawings, specifications and professional judgement still govern.
Featured tools
A focused starting point for this category.
Eurocode Load Combination Calculator
Generate EN 1990 ULS and SLS load combinations with leading actions, ψ factors, exclusive groups and National Annex overrides.
Construction
Concrete Cover Calculator
Calculate and check concrete cover using EN 1992-1-1:2023 Annex P or ACI CODE-318-25 with a transparent calculation trace.
Construction
Steel Weight Calculator
Search structural sections, calculate steel weight and properties, and build a multi-item take-off.
Construction
Rebar Calculator
Estimate reinforcement quantity, total length and steel weight for slabs, walls, footings, beams and columns.
Construction
Cut List Optimizer
Create optimized one-dimensional cutting layouts with multiple stock lengths, kerf, trim and remnants.
Construction
U-Value Calculator
Calculate ISO 6946 thermal resistance and U-value for multilayer walls, roofs and air-exposed floors.
Construction
Which tool should I use?
Start with the project decision: a standards check, reinforcement estimate, material quantity, building-envelope calculation or site-work quantity.
Structural and standards
Prepare load combinations, check cover requirements, inspect steel sections and review occupancy geometry.
Concrete and reinforcement
Estimate reinforcement and concrete quantities for general elements and footings.
Quantity estimating
Calculate areas and estimate blocks, bricks, tiles, paint, drywall and flooring layouts.
Building envelope and geometry
Review thermal transmittance, roof pitch and stair geometry.
Site works and fabrication
Estimate runoff, excavation, aggregate and asphalt or optimize a cut list.
All Construction
22 free browser-based tools
Area Calculator
Calculate and combine rectangle, circle, triangle, polygon and other areas with add/subtract components.
Construction
Cut List Optimizer
Create optimized one-dimensional cutting layouts with multiple stock lengths, kerf, trim and remnants.
Construction
Flooring Layout Calculator
Plan plank direction, stagger, expansion gap, balanced rows, boxes and cost with a scaled diagram.
Construction
Stair Calculator
Calculate straight-stair risers, treads, run, angle, inclined length and custom dimensional checks.
Construction
Concrete Calculator
Plan concrete for multiple slabs, footings, walls, beams and columns with waste, order rounding, weight and cost.
Construction
Rebar Calculator
Estimate reinforcement quantity, total length and steel weight for slabs, walls, footings, beams and columns.
Construction
Concrete Cover Calculator
Calculate and check concrete cover using EN 1992-1-1:2023 Annex P or ACI CODE-318-25 with a transparent calculation trace.
Construction
Eurocode Load Combination Calculator
Generate EN 1990 ULS and SLS load combinations with leading actions, ψ factors, exclusive groups and National Annex overrides.
Construction
Occupant Load Calculator
Calculate design occupant loads for multiple spaces using 2024 IBC model-code factors or custom local factors.
Construction
Rainwater Runoff Calculator
Estimate Rational Method peak flow or rainfall-event runoff volume for composite catchments.
Construction
Excavation Calculator
Calculate bank and loose excavation volume, spoil, truck loads and cost for trenches, pits and battered excavations.
Construction
U-Value Calculator
Calculate ISO 6946 thermal resistance and U-value for multilayer walls, roofs and air-exposed floors.
Construction
Gravel Calculator
Calculate aggregate volume, tonnes, waste, truck loads and cost across multiple shapes.
Construction
Asphalt Calculator
Estimate compacted asphalt volume, tonnes, allowance, truck loads and material cost.
Construction
Drywall Calculator
Estimate plasterboard sheets for walls, rooms and ceilings with openings, waste and cost.
Construction
Roof Pitch Calculator
Convert roof rise and run, angle, percentage slope, pitch ratio and rafter length.
Construction
Concrete Footing Calculator
Estimate concrete volume, weight, premix bags and cost for multiple footing types.
Construction
Concrete Block Calculator
Estimate concrete blocks or CMU with openings, joints, waste, cost, mortar and optional fill.
Construction
Steel Weight Calculator
Search structural sections, calculate steel weight and properties, and build a multi-item take-off.
Construction
Paint Calculator
Estimate paint for multiple rooms and walls with openings, coats, product coverage, waste, pack rounding and cost.
Construction
Tile Calculator
Estimate tiles across multiple areas with exclusions, grout joints, layout waste, cartons, spare tiles and cost.
Construction
Brick Calculator
Estimate bricks for multiple walls with openings, joint size, leaf multiplier, waste, packs, cost and approximate mortar.
Construction
About Construction Calculators
Prepare early quantities, review geometry and run standards-based checks for construction planning. Confirm results against drawings, specifications, adopted standards and site conditions.