Free Online Calculators
Finance, math, health, construction, and everyday tools in one searchable catalog.
Favorites
Battery Runtime Calculator — Backup Load Planner
Beam Deflection Calculator — Loads & Diagrams
Birdsmouth Cut Calculator
Board Foot Calculator — Lumber List & Cost
Board and Batten Calculator — Spacing & Layout
Body Fat Calculator — Navy Method & Lean Mass
Box Cushion Calculator & Mixed Fabric Plan
Calorie Calculator
Candle Wax Calculator
Carpet Calculator — Roll Length, Layout & Cost
Carport Calculator — Layout, Materials & Cost
Circle Skirt Calculator — Pattern & Fabric
Calculator descriptions
Battery Runtime Calculator — Backup Load Planner
Plan how long a battery can power your outage loads. Switch appliances on or off, enter measured watts and duty cycles, and check the battery, goal and inverter together.
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.
Body Fat Calculator — Navy Method & Lean Mass
Enter height, neck and waist (plus hip for the female equation) to see the estimate immediately; optionally add weight for fat mass, lean mass and a target scenario.
Box Cushion Calculator & Mixed Fabric Plan
Plan finished box cushion covers of different sizes on one fabric. Get cut pieces, zipper halves, a layout and an existing-cut check.
Calorie Calculator
Calculate BMR, TDEE, and daily calories for weight loss, maintenance, or muscle gain in metric or imperial units, with a visual macro breakdown.
Candle Wax Calculator
Plan mixed candle sizes, weigh wax and fragrance, and work out complete batches from your ingredient stock.
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.
Circle Skirt Calculator — Pattern & Fabric
Draft quarter to double-circle skirts with seam allowances, a waistband and fabric layout. Print an actual-size panel on A4 or Letter paper.
