Sand Calculator Australia: Volume & Cost Guide

A sand calculator for Australia works out how much sand you need in cubic metres (m³) and tonnes (t) based on the length, width, and depth of the area you’re filling. You enter the area’s dimensions and the sand depth, and the calculator returns the volume in cubic metres and the approximate weight in tonnes, so you can order the right amount from a landscape supplier. Below we explain the formulas, how to use them for your project, and what to watch out for when ordering sand in Australia.

Formula

The calculator uses two simple formulas:

• Volume (m³) = Length (m) × Width (m) × Depth (m)
• Weight (tonnes) = Volume (m³) × Bulk Density (t/m³)

Where:

• Length – the longest side of the area in metres (m).
• Width – the shorter side in metres (m).
• Depth – how thick the sand layer will be, entered in centimetres (cm) and divided by 100 to convert to metres.
• Bulk density – the weight of one cubic metre of sand. The calculator uses 1.6 t/m³ as a typical value for dry, loose sand. Wet or compacted sand can weigh up to 2.0 t/m³.

The first output is the volume in cubic metres, which is what most Australian suppliers use for quoting. The second output is the approximate weight in tonnes, which helps when you’re arranging delivery or checking trailer capacity.

Worked Example

Let’s use the default values: a lawn area 10 m long, 5 m wide, with a 5 cm layer of sand.

1. Convert depth to metres: 5 cm ÷ 100 = 0.05 m
2. Calculate volume: 10 m × 5 m × 0.05 m = 2.5 m³
3. Calculate weight: 2.5 m³ × 1.6 t/m³ = 4.0 tonnes

The calculator shows 2.50 m³ and 4.00 t, matching the manual calculation. If you’re ordering from a supplier, you’d ask for 2.5 cubic metres of sand – most will sell by the cubic metre, not by weight.

Why Use a Sand Calculator in Australia?

Sand is sold by volume (cubic metres) in Australia, but delivery trucks often have weight limits. Knowing both numbers lets you:

• Order the correct amount without over- or under-ordering.
• Compare quotes from different suppliers who may price by volume or weight.
• Check if your ute or trailer can safely carry the load (remember, 1 m³ of sand weighs about 1.6 tonnes – most standard utes can’t carry that).
• Plan the number of trips or the size of the delivery truck.

Common projects where you’d use this calculator include laying a sand base under pavers, filling a sandpit, creating a beach volleyball court, or levelling a lawn area before turf.

How to Choose the Right Sand

Not all sand is the same. The type you need depends on the job:

• Brickie’s sand – fine, washed sand used for mortar and brickwork.
• River sand – coarser, used for concrete and drainage layers.
• Fill sand – cheaper, less consistent, used for backfilling and raising ground.
• Play sand – clean, washed, and free of sharp particles, safe for sandpits.
• Horticultural sand – sharp sand that improves drainage in soil mixes.

For a paver base, you typically need a compactable sand like river sand or a crushed rock dust. For a sandpit, look for certified play sand. The calculator doesn’t know which type you’re using, but the volume calculation is the same – only the density (and price) changes.

Common Mistakes When Ordering Sand

Even with a calculator, people often make these errors:

• Mixing units – measuring length in feet and width in metres, or entering depth in centimetres when the calculator expects inches. Always convert everything to the same unit first.
• Forgetting compaction – sand compacts by 10–20% when tamped. If you’re filling a trench that will be compacted, add 10–15% extra to your volume.
• Assuming 1 tonne = 1 m³ – this is false. One cubic metre of sand weighs about 1.6 tonnes, so 1 tonne is only about 0.6 m³.
• Rounding too early – if you round 2.46 m³ to 2 m³, you’ll be short. Order up to the next 0.25 m³ or 0.5 m³ increment.

Also, note that suppliers may quote in “cubic metres loose� – the volume before compaction. If you need a 10 cm compacted layer, you might need to order 11–12 cm of loose sand.

Comparing Suppliers and Costs

Sand prices in Australia vary by location, type, and delivery distance. As a general guide, a cubic metre of fill sand might cost around $50–$100, while washed river sand or play sand can be $100–$200 per cubic metre. Delivery often adds $50–$150 depending on how far you are from the quarry.

To compare fairly:

• Ask for quotes in cubic metres, not tonnes.
• Check if delivery is included.
• Ask about a minimum order – many suppliers won’t deliver less than 0.5 m³.
• Consider buying in bulk bags (typically 1 m³ or 1.5 m³) for small projects.

Remember, the cheapest sand might not be the best for your project – sharp sand for concreting is different from soft play sand. Always confirm the sand type matches your intended use.

Safety and Handling Tips

Sand is heavy and can be hazardous if handled incorrectly:

• Wear a dust mask when handling dry sand – silica dust can damage lungs over time.
• Lift bags with your legs, not your back. A 1 m³ bulk bag weighs over 1.5 tonnes – never try to move it by hand.
• When sand is delivered in a pile, keep children away – sand can collapse and trap them.
• If you’re using sand for a sandpit, choose washed play sand that is free from crystalline silica and dust.
• Wet sand is heavier than dry sand – if you’re moving it after rain, expect the weight to increase.

If you’re ordering a truckload, make sure the delivery driver can access your site and that the ground can support the weight of the truck. Soft driveways can be damaged by heavy deliveries.

Frequently Asked Questions

How many cubic metres are in a tonne of sand?

It depends on the density, but for dry loose sand at 1.6 t/m³, one tonne is about 0.625 m³. Wet sand can be denser, so one tonne might be only 0.5 m³. Always ask your supplier for the specific density of the sand they’re selling.

How deep should a sand base be for pavers?

For a typical paver patio, you need about 25–30 mm of sand under the pavers (the bedding layer). If you’re also adding a crushed rock base, that’s usually 100–150 mm. Use the calculator with a depth of 3 cm for the bedding sand.

Can I use this calculator for a sandpit?

Yes. Measure the inside length and width of the sandpit, and decide how deep you want the sand – usually 20–30 cm. Then use the calculator to get the volume. For a circular sandpit, measure the diameter, divide by 2 to get the radius, and use the formula π × r² × depth.

How much sand do I need for a 100 m² lawn at 5 cm deep?

Using the formula: 100 m² × 0.05 m = 5 m³. That’s about 8 tonnes of sand (at 1.6 t/m³). This could be a typical amount for topdressing a lawn, but always check with your supplier for the exact density.

What is the difference between sand and soil in terms of weight?

Sand is heavier than most soils. Dry sand weighs about 1.6 t/m³, while dry topsoil is around 1.2–1.3 t/m³. That’s why a cubic metre of sand is noticeably heavier to move than the same volume of soil.

Do I need to compact sand before laying pavers?

Yes, the sand base should be compacted to prevent settling. Use a plate compactor for larger areas. Remember that compaction reduces volume, so order 10–15% more sand than the calculated volume to account for this.

Related

• Mulch for 1000 Sq Ft: How Much You Need
• How Much Mulch for 500 Square Feet?
• How Much Mulch Per Square Foot?

in l | Lawn length | m | 10 | 0 | 1000
in w | Lawn width | m | 5 | 0 | 1000
in d | Depth | cm | 5 | 0 | 200
out m3 | Volume | m³ | l * w * (d / 100) | 2
out t | Weight (approx) | t | (l * w * (d / 100)) * 1.6 | 2