Practical Calculators
Browse practical calculators by topic instead of scrolling through one mixed list.
Structural basics
Beam reactions and area-to-line-load conversions.
▦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 & geometry
Roof pitch, roof quantities, panels and ramp geometry.
◫Building physics & energy
Thermal performance, heat loss, moisture and solar/battery planning.
⌁MEP & utilities
Airflow, ducts, pipes, pumps, voltage drop and lighting.
≈Water & site
Runoff, rainwater collection and sloped trench quantities.
∑Estimating & cost
Transparent quantity-to-cost planning with editable allowances.
Structural basics
Simply Supported Beam Reaction Calculator
Preliminary support reactions for a simply supported beam carrying a full-span UDL plus one point load.
Browse calculatorsStructural basicsArea 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.
Browse calculatorsConcrete & reinforcement
Concrete Slab Calculator
Estimate concrete volume for a rectangular slab, including a user-defined waste allowance.
Browse calculatorsConcrete & reinforcementConcrete Footing Calculator
Calculate concrete for strip or pad footings and repeat identical footings with one count input.
Browse calculatorsConcrete & reinforcementConcrete Column Calculator
Estimate concrete volume for rectangular or circular columns, including multiple identical columns.
Browse calculatorsConcrete & reinforcementConcrete Wall Calculator
Calculate net concrete wall volume after subtracting door and window opening volume.
Browse calculatorsConcrete & reinforcementConcrete Stairs Calculator
Preliminary concrete volume for a straight stair flight using waist-slab and step geometry.
Browse calculatorsConcrete & reinforcementReady-Mix Order Calculator
Turn measured concrete volume into a planning order and estimated number of truck loads.
Browse calculatorsConcrete & reinforcementRebar Weight Calculator
Estimate reinforcement mass from bar diameter, total length and bar count using the common metric approximation.
Browse calculatorsConcrete & reinforcementRebar Grid Calculator
Calculate bar counts, total installed length and approximate steel weight for a rectangular two-direction rebar grid.
Browse calculatorsSteel & metal
Steel Plate Weight Calculator
Calculate steel plate mass from plate dimensions, quantity and material density.
Browse calculatorsSteel & metalSteel Round Bar Weight Calculator
Estimate round steel bar mass from diameter, length and quantity.
Browse calculatorsSteel & metalSteel Pipe / CHS Weight Calculator
Calculate theoretical mass of circular hollow steel sections from outside diameter and wall thickness.
Browse calculatorsSteel & metalRHS / SHS Weight Calculator
Calculate theoretical mass for rectangular or square hollow steel sections.
Browse calculatorsMasonry & finishes
Brick Wall Calculator
Estimate bricks from net wall area, brick face dimensions, joint thickness and waste.
Browse calculatorsMasonry & finishesConcrete Block Wall Calculator
Estimate concrete masonry units for a wall after deducting openings and adding waste.
Browse calculatorsMasonry & finishesMortar Bag Calculator
Estimate mortar bags from masonry area and the coverage stated by the mortar supplier.
Browse calculatorsMasonry & finishesPlaster / Render Calculator
Calculate wet plaster or render volume and approximate bag quantity from wall area and thickness.
Browse calculatorsMasonry & finishesDrywall Sheet Calculator
Estimate drywall sheets for walls or partitions, with openings, number of faces and waste.
Browse calculatorsMasonry & finishesPaint Calculator
Estimate paint volume from net area, number of coats, coverage and waste.
Browse calculatorsMasonry & finishesTile Calculator
Estimate tile count and full boxes from floor or wall area, tile dimensions and waste.
Browse calculatorsMasonry & finishesFlooring Pack Calculator
Estimate laminate, vinyl or engineered flooring packs from room area and pack coverage.
Browse calculatorsGroundworks
Excavation Calculator
Calculate bank excavation volume, loose volume after bulking and estimated truck loads.
Browse calculatorsGroundworksFill Material Calculator
Estimate compacted fill volume, loose order quantity and optional material mass.
Browse calculatorsGroundworksGravel Calculator
Estimate gravel volume and mass for bases, paths and landscaping layers.
Browse calculatorsGroundworksAsphalt Calculator
Estimate compacted asphalt volume and tonnage from paved area, layer thickness and density.
Browse calculatorsRoof & geometry
Roof Pitch Calculator
Convert roof rise and horizontal run into angle, slope percentage, pitch ratio and slope factor.
Browse calculatorsRoof & geometryGable Roof Area Calculator
Estimate total sloped area of a symmetrical gable roof from building length, total span and rise.
Browse calculatorsRoof & geometryRoof Panel Calculator
Estimate the number and total length of full-height panels for a symmetrical gable roof.
Browse calculatorsRoof & geometryRamp Slope Calculator
Convert rise and horizontal run into slope percentage, angle and 1:n ratio.
Browse calculatorsBuilding physics & energy
U-Value Calculator
Calculate total thermal resistance and U-value for a layered building element.
Browse calculatorsBuilding physics & energyInsulation Thickness for Target U-Value
Estimate insulation thickness needed to reach a target U-value after accounting for other thermal resistances.
Browse calculatorsBuilding physics & energyBuilding Heat Loss Calculator
Estimate transmission and ventilation heat loss from envelope area, U-value, air changes and temperature difference.
Browse calculatorsBuilding physics & energyDew Point & Surface Condensation Calculator
Calculate dew point from air temperature and relative humidity and compare it with a surface temperature.
Browse calculatorsBuilding physics & energySolar PV Energy Yield Calculator
Estimate daily, monthly and annual PV energy from installed kWp, peak sun hours and performance ratio.
Browse calculatorsBuilding physics & energyBattery Backup Runtime Calculator
Estimate usable stored energy and backup runtime from battery capacity, depth of discharge, efficiency and load.
Browse calculatorsMEP & utilities
Air Changes (ACH) to Airflow Calculator
Convert room volume and air changes per hour into ventilation airflow in m³/h and L/s.
Browse calculatorsMEP & utilitiesDuct Air Velocity Calculator
Calculate duct cross-section area and air velocity from airflow and duct dimensions.
Browse calculatorsMEP & utilitiesPipe Flow Velocity Calculator
Calculate internal pipe velocity from volumetric flow and inside diameter.
Browse calculatorsMEP & utilitiesPump Hydraulic Power Calculator
Estimate hydraulic and input shaft power from flow, head, fluid density and efficiency.
Browse calculatorsMEP & utilitiesVoltage Drop Calculator
Estimate resistive voltage drop for single-phase or three-phase circuits from current, length and conductor area.
Browse calculatorsMEP & utilitiesRoom Lighting & Lumens Calculator
Estimate required lamp lumens and fixture count from room area, target illuminance and utilization factors.
Browse calculatorsWater & site
Rational Method Runoff Calculator
Estimate peak runoff flow from catchment area, rainfall intensity and runoff coefficient.
Browse calculatorsWater & siteRainwater Harvesting Calculator
Estimate collectable rainwater from roof area, rainfall depth and collection efficiency.
Browse calculatorsWater & siteSloped Trench Excavation Calculator
Calculate trapezoidal trench excavation volume with equal side slopes and optional bulking allowance.
Browse calculators