Structures & Area Calculators
Planning to build a deck, fence, pergola, shed, or gazebo? Backyard structures require careful planning, sizing, and budgeting. Our free structure calculators estimate framing lumber, post counts, siding panels, roof rafters, concrete footings, and contractor labor rates. Choose a tool below to budget your structure.
Concrete Slab Calculator
Free concrete slab calculator — estimate cubic yards, number of bags, and project cost for patios, walkways, footings, and slabs.
Deck Cost Calculator
Free deck cost calculator — estimate decking materials, labor costs, and total installation budget based on size and wood or composite material options.
Deck Joist Span & Spacing Calculator
Free deck joist calculator. Estimate joist counts, joist spacings (12, 16, or 24 inches on-center), joist hangers, and verify IRC-compliant maximum allowable spans.
Deck Pier & Concrete Footing Calculator
Free deck pier & footing calculator — calculate required concrete bags (60lb/80lb), volume in yards, and gravel subbase for deck cylindrical post piers.
Fence Calculator
Free fence calculator — estimate the number of fence posts, rails, pickets, and overall material budget for installing wood or vinyl fencing.
Fire Pit Calculator
Free fire pit calculator — calculate blocks, gravel, sand, and materials cost for your DIY fire pit project. Works for circular and square designs.
Gazebo Cost Calculator
Free gazebo cost calculator — estimate footprint area, octagon or square style materials, labor, and total construction budget.
Gutter & Downspout Calculator
Free gutter & downspout calculator — calculate roof catchment area, water run-off flow rates, recommended gutter size, and required downspout quantities.
Outdoor Fireplace Cost & Materials Calculator
Free outdoor fireplace calculator. Estimate cinder blocks, firebrick linings, concrete footings, stone veneer area, and costs.
Outdoor Kitchen Cost Calculator
Free outdoor kitchen calculator — estimate countertop area, base masonry veneer surface, built-in BBQ appliances, labor, and total island construction budget.
Pergola Cost Calculator
Free pergola cost calculator — estimate lumber materials, rafters, slats, post count, and total DIY or professional construction budget.
Pergola Shade & Slat Calculator
Free pergola shade & slat calculator — calculate the percentage of shade cast by rafters/slats at different sun angles and estimate timber counts.
Pond Volume & Pump Size Calculator
Free pond volume calculator. Estimate pond capacity in gallons, required rubber liner dimensions (including depth and overhang), and recommended filtration pump GPH.
Rainwater Harvesting Calculator
Free rainwater harvesting calculator — estimate monthly and annual water collection volume in gallons based on roof footprint and local precipitation.
Retaining Wall Block Calculator
Free retaining wall calculator. Estimate block counts, material costs, and base gravel volume for building landscaping walls.
Shed Cost Calculator
Free shed cost calculator — estimate footprint area, framing studs, siding panels, roof rafters, and total construction cost.
Square Footage Calculator
Free square footage calculator — calculate area in square feet, square yards, or square meters for any shape. Perfect for patios, rooms, and gardens.