Bulk vs bags: buying mulch, soil, gravel and concrete

Last reviewed 2026-06-06

Bagged is convenient; bulk is cheaper past a surprisingly low threshold. Here is where the line is for each material.

Loose materials — mulch, soil, gravel, sand and concrete — are sold two ways: bagged, or in bulk by the cubic yard / cubic metre (or tonne). Bags are convenient and clean; bulk is much cheaper per unit once you need a meaningful quantity. The trick is knowing where the line sits for your project.

The quick rule

As a rough guide, once you need more than about 6–10 bags of a material, a bulk delivery usually works out cheaper — often dramatically so for big jobs. Below that, bags win on convenience and the lack of a delivery fee.

Mulch

• A cubic yard equals 27 cubic feet, so it takes about 13–14 standard 2 cu ft bags to equal one cubic yard.
• For a single small bed, bags are fine. For anything approaching a cubic yard, bulk is usually half the price or less.
• Use the mulch calculator to get both the cubic yards and the bag count, then compare prices.

Soil and compost

• Raised beds swallow more soil than people expect — a single 4 × 8 ft bed at 10 in deep is about a cubic yard.
• Bagged soil is convenient for one bed but expensive at scale; multiple beds almost always favour bulk.
• The raised bed soil calculator gives litres, bags and cubic feet so you can price both options.

Gravel, stone and sand

• These are heavy and usually sold by the tonne in bulk — share the weight, not just the volume, when getting a quote.
• Driveways and paths almost always justify bulk; a small decorative border might not.
• Remember to add 10–15% for compaction — the gravel calculator shows both volume and weight.

Concrete

• Bagged pre-mix is ideal for posts and small pads. An 80 lb bag yields only about 0.6 cu ft, so volumes add up fast.
• Above roughly one cubic yard (around 45 × 80 lb bags), ready-mix delivery is cheaper, faster and avoids weak cold joints from mixing in batches.
• The concrete calculator gives the cubic yards and the bag count so you can see which side of the line you are on.

Don’t forget the hidden costs

Bulk delivery has a fee and needs somewhere to dump the pile (and a wheelbarrow to move it). Bags need lifting, storing and disposing of. Factor both in — but for most projects beyond a handful of bags, bulk still wins comfortably on total cost.

Calculators for this

• Mulch Calculator — Cubic yards or bags of mulch for your beds.
• Raised Bed Soil Calculator — Litres, bags or cubic feet of soil to fill raised beds.
• Gravel Calculator — Cubic yards and tons of gravel, stone or sand.
• Concrete Calculator — Cubic yards and bags of concrete for a slab.