FREE CONSTRUCTION & ENGINEERING CALCULATORS
Measure.
Calculate. Verify.
Fast, transparent calculators for construction and engineering workflows. No account. No checkout. Enter your measurements and get the quantity you need.
BROWSE BY WORKFLOW
Construction tools, grouped the way work happens.
Start with material quantities and geometry. Engineering helpers are intentionally limited to transparent preliminary calculations and clearly state what they do not check.
Concrete & Reinforcement
Concrete volumes, ready-mix planning and reinforcement quantities.
ISteel & Metal
Fast weight calculations for common steel shapes.
▤Masonry & Finishes
Walls, mortar, plaster, drywall, paint, tile and flooring.
▽Groundworks
Excavation, fill, gravel and asphalt planning.
⌂Roof & Site Geometry
Roof pitch, roof quantities, panels and ramp geometry.
△Engineering Helpers
Preliminary load and reaction helpers for early checks.
ALL CALCULATORS
60 practical tools. One clean library.
Concrete Slab Calculator
Estimate concrete volume for a rectangular slab, including a user-defined waste allowance.
Open calculatorConcrete & ReinforcementConcrete Footing Calculator
Calculate concrete for strip or pad footings and repeat identical footings with one count input.
Open calculatorConcrete & ReinforcementConcrete Column Calculator
Estimate concrete volume for rectangular or circular columns, including multiple identical columns.
Open calculatorConcrete & ReinforcementConcrete Wall Calculator
Calculate net concrete wall volume after subtracting door and window opening volume.
Open calculatorConcrete & ReinforcementConcrete Stairs Calculator
Preliminary concrete volume for a straight stair flight using waist-slab and step geometry.
Open calculatorConcrete & ReinforcementReady-Mix Order Calculator
Turn measured concrete volume into a planning order and estimated number of truck loads.
Open calculatorConcrete & ReinforcementRebar Weight Calculator
Estimate reinforcement mass from bar diameter, total length and bar count using the common metric approximation.
Open calculatorConcrete & ReinforcementRebar Grid Calculator
Calculate bar counts, total installed length and approximate steel weight for a rectangular two-direction rebar grid.
Open calculatorSteel & MetalSteel Plate Weight Calculator
Calculate steel plate mass from plate dimensions, quantity and material density.
Open calculatorSteel & MetalSteel Round Bar Weight Calculator
Estimate round steel bar mass from diameter, length and quantity.
Open calculatorSteel & MetalSteel Pipe / CHS Weight Calculator
Calculate theoretical mass of circular hollow steel sections from outside diameter and wall thickness.
Open calculatorSteel & MetalRHS / SHS Weight Calculator
Calculate theoretical mass for rectangular or square hollow steel sections.
Open calculatorMasonry & FinishesBrick Wall Calculator
Estimate bricks from net wall area, brick face dimensions, joint thickness and waste.
Open calculatorMasonry & FinishesConcrete Block Wall Calculator
Estimate concrete masonry units for a wall after deducting openings and adding waste.
Open calculatorMasonry & FinishesMortar Bag Calculator
Estimate mortar bags from masonry area and the coverage stated by the mortar supplier.
Open calculatorMasonry & FinishesPlaster / Render Calculator
Calculate wet plaster or render volume and approximate bag quantity from wall area and thickness.
Open calculatorMasonry & FinishesDrywall Sheet Calculator
Estimate drywall sheets for walls or partitions, with openings, number of faces and waste.
Open calculatorMasonry & FinishesPaint Calculator
Estimate paint volume from net area, number of coats, coverage and waste.
Open calculatorMasonry & FinishesTile Calculator
Estimate tile count and full boxes from floor or wall area, tile dimensions and waste.
Open calculatorMasonry & FinishesFlooring Pack Calculator
Estimate laminate, vinyl or engineered flooring packs from room area and pack coverage.
Open calculatorGroundworksExcavation Calculator
Calculate bank excavation volume, loose volume after bulking and estimated truck loads.
Open calculatorGroundworksFill Material Calculator
Estimate compacted fill volume, loose order quantity and optional material mass.
Open calculatorGroundworksGravel Calculator
Estimate gravel volume and mass for bases, paths and landscaping layers.
Open calculatorGroundworksAsphalt Calculator
Estimate compacted asphalt volume and tonnage from paved area, layer thickness and density.
Open calculatorRoof & Site GeometryRoof Pitch Calculator
Convert roof rise and horizontal run into angle, slope percentage, pitch ratio and slope factor.
Open calculatorRoof & Site GeometryGable Roof Area Calculator
Estimate total sloped area of a symmetrical gable roof from building length, total span and rise.
Open calculatorRoof & Site GeometryRoof Panel Calculator
Estimate the number and total length of full-height panels for a symmetrical gable roof.
Open calculatorRoof & Site GeometryRamp Slope Calculator
Convert rise and horizontal run into slope percentage, angle and 1:n ratio.
Open calculatorEngineering HelpersSimply Supported Beam Reaction Calculator
Preliminary support reactions for a simply supported beam carrying a full-span UDL plus one point load.
Open calculatorEngineering HelpersArea Load to Line Load Calculator
Convert an area load into an equivalent line load using a tributary width, then calculate total load over a member length.
Open calculatorEngineering ChecksSection Properties Calculator
Calculate area, second moments of area, section moduli and radii of gyration for common idealized sections.
Open calculatorEngineering ChecksSteel Beam Preliminary Check
Elastic simply-supported beam check for UDL loading using user-entered section properties, material values and design factors.
Open calculatorEngineering ChecksLoad Combination Calculator
Build transparent ULS and SLS combinations from permanent and variable actions with user-entered partial and combination factors.
Open calculatorEngineering ChecksBolt Group Calculator
Elastic in-plane bolt-group force distribution for direct shear plus torsional moment about the group centroid.
Open calculatorEngineering ChecksFillet Weld Preliminary Check
Preliminary fillet-weld resistance check using total effective weld length and selectable user / EC3-style / AISC-style strength basis.
Open calculatorEngineering ChecksEN 1992-4 Anchor Capacity Organizer
Organize tension and shear demand against user-entered EN 1992-4 / ETA resistance components and partial factors.
Browse toolsEngineering ChecksACI 318-25 Anchor Capacity Organizer
Organize factored anchor demand against user-entered ACI 318-25 nominal group strengths and strength-reduction factors.
Browse toolsEngineering ChecksTrapezoidal Sheet Preliminary Check
Single-span sheet check using manufacturer/user effective section properties, design resistance and service deflection.
Browse toolsEngineering ChecksSteel Base Plate Preliminary Check
Check full-contact concrete bearing pressure and a simple cantilever-strip plate bending estimate for a rectangular steel base plate.
Browse toolsEngineering ChecksPunching Shear Demand & Capacity Helper
Calculate critical perimeter, punching shear stress and utilization using a user-entered design shear resistance.
Browse toolsEngineering ChecksEC3 Steel Beam Screening Check
EC3-style beam screening using user-entered section properties and χLT; checks bending, shear and elastic deflection.
Browse toolsEngineering ChecksEC3 Column Buckling Check
EC3-style flexural buckling reduction using Euler critical load, non-dimensional slenderness and user-selected imperfection factor α.
Browse toolsEngineering ChecksAISC 360-22 Beam Section Check
AISC 360-22 section-level yielding/shear screening using Zx, web shear area and user-entered resistance factors.
Browse toolsEngineering ChecksAISC 360-22 Column Compression Check
AISC 360-22 compression-column screening using KL/r, Euler stress and the standard inelastic/elastic column curve.
Browse toolsCanada · SteelCSA S16:24 Steel Beam Preliminary Check
Canadian steel-beam screening with editable resistance and stability modifiers.
Open calculatorCanada · SteelCSA S16:24 Compression Member Organizer
Compression screening with Euler reference and a user-verified CSA stability modifier χ.
Open calculatorCanada · LoadsNBCC 2025 Load Combination Workspace
Editable Canadian load-combination workspace for D, L, S, W and E effects.
Open calculatorCanada · ConcreteCSA A23.3:24 Punching Shear Organizer
Punching-shear demand compared with a user-verified CSA factored resistance vr.
Open calculatorChina · SteelGB 50017-2017 Steel Beam Preliminary Check
Chinese steel-beam screening using entered design strengths and stability coefficient φb.
Open calculatorChina · SteelGB 50017-2017 Compression Member Organizer
Compression screening using a user-entered stability coefficient φ.
Open calculatorChina · ConcreteGB/T 50010-2010 (2024) Punching Shear Organizer
Punching-shear demand for Chinese concrete design compared with a verified resistance.
Open calculatorChina · LoadsChina Load Combination Workspace
Editable load-combination workspace for Chinese building design.
Open calculatorCanada · TimberCSA O86:24 Timber Beam Demand & Resistance Organizer
Rectangular timber-beam demand check using user-verified factored bending and shear resistances.
Open calculatorCanada · MasonryCSA S304:24 Masonry Wall Stress Organizer
Axial-plus-bending wall stress organizer with user-verified masonry compression and tension resistance limits.
Open calculatorCanada · LoadsNBCC 2025 Wind Pressure Workspace
Transparent wind-pressure workspace using reference velocity pressure and editable NBCC pressure factors.
Open calculatorCanada · LoadsNBCC 2025 Roof Snow Load Workspace
Roof snow load workspace with editable ground snow/rain values and NBCC roof modification factors.
Open calculatorChina · LoadsGB 50009-2012 Wind Pressure Workspace
Chinese wind-pressure workspace using basic wind pressure and editable height, shape and gust factors.
Open calculatorChina · LoadsGB 50009-2012 Roof Snow Load Workspace
Simple Chinese roof snow workspace using basic snow pressure and an editable roof distribution coefficient.
Open calculatorEnvelope · ConnectionsCladding Fastener Load Calculator
Convert design wind pressure or suction into tributary force per cladding fastener and support line load.
Open calculatorRoofing · LoadsPurlin Tributary Load Calculator
Convert roof area loads and purlin spacing into design line load, reactions and simply-supported moment.
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