Measure it. Work it out. Buy it once.
Know how much to buy before you leave the house
Free calculators for mulch, soil, gravel, sod, pavers, walls, fences and decks. Each one shows its working and ends with a shopping list you can print.
Calculators
Beds & soil
Mulch Calculator
Cubic yards or bags for any bed shape and depth, with a bags-versus-bulk cost check.
Raised Bed Soil Calculator
Fill volume for one bed or several, split into a soil mix recipe with settling allowed for.
Topsoil & Compost Calculator
How much to spread, top-dress or dig in, by depth or by mix percentage.
Plant Spacing Calculator
How many plants fill a bed on a square or triangular grid, or along a hedge line.
Lawn
Sod & Grass Seed Calculator
Rolls and pallets of sod, or pounds of seed by grass type, for a new lawn or overseeding.
Lawn Fertilizer Calculator
Turn the N-P-K numbers on the bag into the weight of product your lawn needs.
Paths, patios & walls
Gravel & Stone Calculator
Volume and tons for paths, drives and beds, by stone type, with compaction.
Paver Patio Calculator
Pavers by size and pattern, plus base gravel, bedding sand and edging.
Retaining Wall Block Calculator
Blocks, caps, base and drainage gravel for a garden wall, buried course included.
Concrete Calculator
Slabs, footings and post holes in bags or ready-mix, with the break-even point.
Fences & decks
Fence Calculator
Posts, rails, pickets and concrete from one run length, gates included.
Deck Calculator
Deck boards, joists and fasteners from the deck size, board width and gap.
No calculator matches that. Try a material, such as "soil" or "gravel", or browse the guides.
How our estimates work
- Geometry firstEvery answer starts as an area or a volume worked out from your own measurements, using formulas printed on the page.
- Assumptions in the openBag sizes, densities, seeding rates and waste allowances are listed in a table on each calculator, with the date they were last reviewed.
- Rounded the way things are soldWhole bags, half cubic yards, quarter tons and full courses of block, always rounded up, with the allowance shown as its own line.
Most online calculators give you one number and no way of checking it. Ours show the formula, a breakdown of the result, two worked examples and the mistakes that most often throw an estimate off. If a figure looks wrong, you can trace it back to the measurement that caused it. Where products vary, as stone density and seed rates do, you can replace our assumption with the number from your own supplier.
The calculators give quantities. They do not design structures. For decks, tall walls and anything that needs a permit, the building department and the maker's instructions come first.
From the guides
How to Measure an Irregular Garden Bed
Almost no garden bed is a tidy rectangle. Here are four ways to get a trustworthy area out of a curved, kidney-shaped or awkward bed, using a tape measure and some string.
Bagged vs Bulk Mulch, Soil and Gravel: Finding the Break-Even Point
Bulk is cheaper per yard and bags have no delivery fee. Somewhere between the two is a break-even quantity, and you can work it out in one line.
Waste Factors Explained: Why 10% Is Often Wrong
"Add ten percent" is the most repeated advice in home improvement. It is right about a third of the time. Here is how to pick an allowance that fits the material and the shape of the job.
How Deep Should Mulch Be?
Two to four inches is the short answer. The useful answer depends on what the mulch is made of, what it is going around, and how much is already there.
Paver Base Depth: How Much Gravel and Sand Goes Under a Patio
A paver patio lasts as long as its base. Here is how deep each layer should be, why, and how to turn those depths into tons of gravel and a pile of soil to get rid of.
From Tape Measure to Shopping List: Building and Filling a 4 × 8 Raised Bed
One raised bed, start to finish. The lumber, the cuts, the real inside dimensions, the soil, and the list to take to the store.
Built and reviewed by Bertha. I started The Woven Garden because I was tired of driving back to the garden center for three more bags. Every calculator and guide here is checked against its own worked examples before it goes up, and the assumption tables were last reviewed on October 3, 2026.
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