Free Online Calculators
Finance, math, health, construction, and everyday tools in one searchable catalog.
Favorites
Pipe Displacement Calculator
Plant Spacing Calculator — Bed Layout & Plant Count
Rafter Length Calculator — Pitch, Overhang & Ridge
Rectangular Tube Load Calculator — RHS & SHS Beam
Retaining Wall Calculator — Blocks, Gravel, Drainage & Cost
Roof Shingle Calculator — Roof Planes, Bundles & Cost
Segmented Bowl Calculator & Ring Cut Planner
Sheet Cut List Optimizer
Shiplap Calculator & Cut Planner
Sod Calculator — Rolls, Pallets & Installation Cost
Soil Calculator — Topsoil, Raised Beds, Bags & Cost
Solar & Battery Calculator: Output, Backup and Payback
Calculator descriptions
Pipe Displacement Calculator
Compare closed-end, open-end and steel-body pipe displacement from actual OD, ID and length; solve target displacement length and cross-check internal capacity.
Plant Spacing Calculator — Bed Layout & Plant Count
Plan actual planting places in a rectangular bed, compare row directions and turn the layout into a whole-pack plant order.
Rafter Length Calculator — Pitch, Overhang & Ridge
Calculate common rafter line length with roof pitch, horizontal overhang and ridge-board deduction. View the section and print your measurements.
Rectangular Tube Load Calculator — RHS & SHS Beam
Check RHS or SHS bending stress, deflection and estimated load capacity for steel, stainless steel or aluminum with simple, fixed or cantilever supports.
Retaining Wall Calculator — Blocks, Gravel, Drainage & Cost
Estimate a segmental retaining wall from editable block geometry. Calculate courses, blocks, pallets, caps, base and drainage aggregate, pipe, fabric, excavation and cost.
Roof Shingle Calculator — Roof Planes, Bundles & Cost
Plan shingle bundles for multiple roof planes, with pitch, product coverage, starter strips, ridge caps and your material quotes.
Segmented Bowl Calculator & Ring Cut Planner
Shape a finished bowl profile and plan each horizontal ring, turning allowances and separate-segment wood strips.
Sheet Cut List Optimizer
Plan a cuttable plywood or MDF sheet layout with blade kerf, edge trim and grain-aware rectangular parts.
Shiplap Calculator & Cut Planner
Place wall openings and chosen joints, inspect each shiplap row and get a feasible board cutting schedule.
Sod Calculator — Rolls, Pallets & Installation Cost
Plan lawn areas, whole pallets or loose rolls, and compare your quoted costs with refundable pallet deposits shown separately.
Soil Calculator — Topsoil, Raised Beds, Bags & Cost
Plan new soil for beds and measured areas. Subtract existing fill and compare whole bags with bulk orders and delivery quotes.
Solar & Battery Calculator: Output, Backup and Payback
Estimate rooftop solar panels, output, self-use, exports, battery size, backup hours, shifted energy, payback and 20-year cash flow.
