Fillet Weld Size Calculator
The Fillet Weld Size Calculator computes required leg size and throat thickness to satisfy loads and relevant welding codes.
Construction
Optimize your construction projects with our powerful calculators. From material estimation to cost analysis and structural calculations, these tools are designed to save time and ensure precision for builders, engineers, and DIY enthusiasts.
Browse our 115 calculators to solve common problems in Construction — from quick estimates to detailed results. This hub links to our most-used tools and guides so you can get answers fast.
Start with the popular picks below, or jump into the full list for more specific use cases.
Hydronic Flow Calculator
The Hydronic Flow Calculator calculates water flow rates, pressure drops and pipe sizes for hydronic heating and cooling systems in buildings.
CFM per Person Calculator
The CFM per Person Calculator determines required ventilation rate per person for HVAC design, using occupancy, space type, and building code guidance.
Deck Mud Calculator
The Deck Mud Calculator computes required deck mud volume and bag counts for shower trays and screeds, based on dimensions and fall.
Deck Repair Calculator
The Deck Repair Calculator estimates materials, labour, and total cost to repair decking, factoring dimensions, damage extent, local prices, and VAT.
Allowable Stress Range Calculator
The Allowable Stress Range Calculator calculates permissible stress ranges for structural components under cyclic thermal and mechanical loads to ensure code compliance.
Conduit Jam Ratio Calculator
The Conduit Jam Ratio Calculator computes conduit-to-cable diameter ratios, flags potential jamming conditions, and suggests alternative conduit or cable groupings.
Dimmer Wattage Calculator
The Dimmer Wattage Calculator calculates the correct dimmer rating from total connected wattage, lamp types, quantity, and derating factors.
Build Rate Calculator
The Build Rate Calculator calculates labour and material rates per unit output, factoring crew size, productivity, overheads and regional costs.
Bundle Diameter Calculator
The Bundle Diameter Calculator calculates the overall diameter of cable or conduit bundles based on individual sizes and packing arrangement.
Cyclic Stress Ratio Calculator
The Cyclic Stress Ratio Calculator calculates cyclic stress ratio for site soils under seismic loading to assess liquefaction risk in geotechnical design.
Drip Edge Calculator
The Drip Edge Calculator calculates total drip edge length, piece count, and fixings from roof dimensions, overlaps, and wastage.
Average Setback Calculator
The Average Setback Calculator calculates the required front building line by averaging neighbouring properties’ setbacks under local planning rules.
Fiber Resin Ratio Calculator
The Fiber Resin Ratio Calculator calculates optimal fibre-to-resin ratios for composite layups, converting between weight and volume to minimise waste.
Hot Water Recovery Calculator
The Hot Water Recovery Calculator predicts cylinder recovery time and required heater capacity from draw-off volume, inlet temperature, and demand.
Duct Fitting Loss Coefficient Calculator
The Duct Fitting Loss Coefficient Calculator calculates pressure loss coefficients for duct fittings from size, angle, and flow, supporting accurate HVAC system design.
Dumpster Size Calculator
The Dumpster Size Calculator estimates required skip capacity for construction waste, factoring in material types, site access, and haul frequency.
CFM per Room Calculator
The CFM per Room Calculator calculates required room airflow in CFM using dimensions, ceiling height, air changes, and occupancy assumptions.
Installation Time Calculator
The Installation Time Calculator helps builders quickly estimate labour hours and schedules required for installing construction materials on site.
Cement Mortar Ratio Calculator
The Cement Mortar Ratio Calculator calculates optimal cement-to-sand proportions and water requirements for masonry or plastering, based on project specifications.