Free backyard and patio calculators
6 free calculators for backyard projects: pavers with base gravel and sand, deck boards, joists and screws, mulch and topsoil, fence posts and panels, concrete bags, and what a patio costs by material. Quantities follow manufacturer installation guides.
Updated · By the Interior Redesign AI editorial team · Sources cited on the page
Patios, pavers and concrete
Pavers, base, sand, concrete and patio cost.
Decks and fences
Boards, joists, posts and fasteners.
Garden beds
Mulch, topsoil and compost by the bag or the yard.
How we calculate
Each tool does plain, visible arithmetic in your browser, with no AI and no server call, and shows its formula, a worked example and its sources on the page. Code figures cite the model code section, quantities cite the manufacturer's published spec, and prices cite a named cost guide with the date we checked it.
Where we had to assume something, the page says so and the widget lets you change it. Results are planning numbers, not quotes or code rulings.
More tools for this project
- Free AI Landscape Design · Check your yard photo and pick a garden style.
- All free tools · kitchen, bathroom, paint, flooring, outdoor, exterior and room planning.
Then see it on your yard
The same photo, before and after an AI render. Your walls, windows and layout stay; the finishes change.
Questions
Are these outdoor calculators free?
Yes. They run in your browser, cost nothing and need no account. Only the AI redesign of your own yard photo needs a free account.
Where do the quantities come from?
From manufacturer installation guides and product labels: paver base depths from ICPI guidance and paver makers, bag yields from Quikrete and Sakrete, deck fastener counts from screw makers. Each page links them.
Do I still need a building permit?
Often, for decks, fences over a set height and some patios. The calculators size materials; your local building department decides permits and setbacks.