Outdoor project calculators

Sixteen calculators that all call the same tested calculation layer. Pick the one that matches the decision you are making, then add the result to Project Mode to build a material, cost and shopping plan for the whole job.

The four calculators most outdoor projects start with.

Landscaping materials

Bulk materials sold by the cubic yard, tonne or bag, planned from your measured area.

Driveways and hardscape

Layered builds where each layer, material and depth is priced and ordered separately.

Fence, deck and cost planners

Component-level planning for fences and decks, and cost planners that only use prices you enter.

How to choose

Four questions decide which calculator you need

  • You need one material quantityStart with a material calculator — gravel, mulch, topsoil, soil, sand, pea gravel, landscape rock or paver base. Each one takes your measured area and depth and returns volume, weight, bag counts and a cost estimate from your own price.
  • You are building in layersUse the driveway gravel, paver, paver patio or concrete calculator. They plan each layer separately — base, bedding, surface — because those layers have different depths, compaction factors and suppliers.
  • You need a component take-offFence, fence post and deck material calculators break a build into posts, rails, pickets, panels, boards, joists and fasteners, so you can order from a cut list instead of a lump sum.
  • You need a cost, not a quantityFence cost and paver cost inputs accept your supplier prices and flag anything unpriced. Nothing is priced for you, so a partial quote stays visibly partial.
Project Mode

Calculators give you an answer. Project Mode keeps them together.

A driveway is not one material and a patio is not one order. Project Mode combines results from any calculator into a single plan.

One material list

Every added calculation becomes a material line with its quantity, unit, cost category, entered price and any assumptions that were used — together with a note of what it was calculated from.

Costs you can trace

Costs group by category, missing prices are shown as "Price not entered" instead of being guessed, and extra lines like delivery, base rental or permits can be added by hand.

A printable plan

The project prints as a material list, cost breakdown, shopping list with checkboxes and an assumptions page — so the plan works away from this browser.

Frequently asked questions

Using these calculators

Which calculator should I start with?

Start with the material you are ordering first — usually the base or bulk material. Once that quantity exists, add it to Project Mode and let the next calculation join it in the same plan.

Do all sixteen calculators work the same way?

They share the same engine and the same conventions: areas are added before volume is calculated, waste and compaction are applied consistently, and order quantities are rounded up where ordering requires it.

Do you support metric measurements?

The forms are built around US units (feet, inches, cubic yards, tons). Results include square and cubic metre conversions in the engine output, but the input forms ask for feet and inches.

Can I calculate several areas at once?

Yes. Area-based calculators accept multiple shapes — rectangles, circles, triangles or a known square footage — and add them before calculating volume.

Will the calculator fill in prices for me?

No. Every price is something you enter, and an estimate without a price shows "Price not entered" rather than an invented figure.

How do I keep the results?

Use Add to Project on any calculator, then open Project Mode to combine, edit and print the plan, or save the printable plan as a PDF.