Free Online Calculators
Finance, math, health, construction, and everyday tools in one searchable catalog.
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Beam Deflection Calculator — Loads & Diagrams
Birdsmouth Cut Calculator
Board Foot Calculator — Lumber List & Cost
Board and Batten Calculator — Spacing & Layout
Carpet Calculator — Roll Length, Layout & Cost
Carport Calculator — Layout, Materials & Cost
Concrete Calculator — Cubic Yards, Bags & Cost
Deck Board Calculator — Cut List, Stock Lengths & Cost
Dry Well Calculator — Storage, Pit Size & Drain Time
Drywall & Plasterboard Calculator — Sheets & Cost
Drywall Mud Calculator — Compound & Tape Purchase Plan
Duct Size Calculator — Compare Available Sizes
Calculator descriptions
Beam Deflection Calculator — Loads & Diagrams
Combine point and distributed loads on a simply supported or cantilever beam. Explore deflection, shear, bending moment and reactions in metric or US units.
Birdsmouth Cut Calculator
Lay out a common-rafter birdsmouth from seat length, target HAP or notch depth. See true perpendicular removal, plate bearing, angles and a printable measurement sheet.
Board Foot Calculator — Lumber List & Cost
Add stock boards, compare supplier quote units and estimate your lumber order. See board feet, whole spare boards and a clear cost breakdown.
Board and Batten Calculator — Spacing & Layout
Plan even batten spacing in inches or millimetres. Compare layouts, see a scaled wall and print precise installation marks.
Carpet Calculator — Roll Length, Layout & Cost
Compare two carpet layouts, allow for edge trimming, and estimate roll length and costs from your supplier’s quotes.
Carport Calculator — Layout, Materials & Cost
Plan a freestanding steel carport with an editable post grid, roof, sheets, framing lengths, footings, fasteners and a transparent preliminary material budget.
Concrete Calculator — Cubic Yards, Bags & Cost
Enter a slab, footing, column, stair, or mixed pour and see concrete cubic yards immediately, then refine waste, truck loads, bags, and cost.
Deck Board Calculator — Cut List, Stock Lengths & Cost
Compare board directions and stock lengths for a rectangular deck. Count cut pieces, gaps, saw kerf, spare boards and quoted material cost.
Dry Well Calculator — Storage, Pit Size & Drain Time
Size or check a residential dry well from roof runoff, rainfall, storage media, pit dimensions and a measured infiltration rate. Compare storage, drain-down, excavation, fabric, modules and editable cost.
Drywall & Plasterboard Calculator — Sheets & Cost
Plan drywall or plasterboard for one or several rooms. Choose US or metric board sizes, separate walls and ceilings, subtract openings and price your order in USD or GBP.
Drywall Mud Calculator — Compound & Tape Purchase Plan
Estimate joint compound and paper tape from installed drywall area, then round to whole containers and subtract full packages already on hand.
Duct Size Calculator — Compare Available Sizes
Compare your round and rectangular duct sizes against airflow, velocity, straight friction and available space. Work in US or SI units and save your comparison.
