How do I calculate how much sand I need?

Multiply the length (m) × width (m) × depth (m) to get the volume in cubic metres. Then multiply by 1.6 to get the weight in tonnes. For example, a 5m × 3m area at 100mm depth = 5 × 3 × 0.1 = 1.5 m³, weighing 2.4 tonnes.

What is the difference between building sand and plaster sand?

Building sand is coarser and used for mixing mortar for bricklaying and general construction. Plaster sand is finer and washed, used specifically for plastering walls and ceilings. Plaster sand produces a smoother finish. In South Africa, building sand typically costs R400–R600/m³ and plaster sand R500–R700/m³.

How much does a cubic metre of sand weigh?

A cubic metre of sand weighs approximately 1.6 tonnes (1,600 kg). This is the average bulk density for typical construction sand. Wet sand can weigh slightly more at around 1.8–2.0 t/m³.

How many 50kg bags of sand make a cubic metre?

One cubic metre of sand weighs about 1,600 kg, so you need approximately 32 bags of 50kg sand per m³. However, for small quantities, retail bags are expensive — bulk delivery becomes cost-effective above about 2 m³.

What is the price of sand per cubic metre in South Africa in 2026?

In 2026, SA sand prices are approximately: Fill sand R250–R400/m³; River sand R350–R500/m³; Building sand R400–R600/m³; Plaster sand R500–R700/m³. Prices vary by region, with KZN and coastal areas often slightly higher due to transport costs. These are bulk delivery prices — retail bags cost more per m³.

Sand Calculator South Africa

Calculate exactly how much sand you need for your South African building project. Get volume in m³, weight in tonnes, number of 50kg bags, and estimated cost based on current SA sand prices.

⚡ Quick Calculator Get a fast estimate

Length (m)

Width (m)

Depth (m)

Tip: 100mm = 0.1m, 50mm = 0.05m

Sand Type

Volume Required

1.50 m³

Weight (tonnes)

2.40 t

50kg Bags Needed

49 bags

Estimated Cost (bulk)

R 600 – R 900

Cost per m³

R 400 – R 600

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How to Use the Sand Calculator

Enter your area's length, width, and depth in metres. Select the sand type — building, plaster, river, or fill sand — and the calculator instantly shows you volume, weight, 50kg bag count, and estimated cost in ZAR.

For depth: 100mm = 0.1m, 50mm = 0.05m, 25mm = 0.025m. The Extended Calculator below handles multiple areas and different shapes. The Professional Calculator creates a full project sand budget.

Volume (m³) = Length × Width × Depth Weight (tonnes) = Volume × 1.6 Bags (50kg) = Weight × 1,000 ÷ 50

Need more detail?

📊 Extended Calculator More options, charts, and scenario comparison

Sand Type

Supplier Type

Areas

Shape

Length (m)

Width (m)

Depth (m)

Area: 15.00 m² | Volume: 1.500 m³

Total Volume Required

1.50 m³

Weight

2.40 tonnes

50kg Bags

49 bags

Est. Cost (bulk)

R 600 – R 900

Cross-section diagram showing sand layer depth (average 100mm)

Types of Sand Used in South African Construction

Sand Type	Use	Price/m³ (2026)	Density
Building Sand	Bricklaying mortar, general backfill	R400 – R600	1.6 t/m³
Plaster Sand	Wall and ceiling plastering	R500 – R700	1.6 t/m³
River Sand	Concrete mixing, paving bedding	R350 – R500	1.6 t/m³
Fill Sand	Site levelling, sub-base fill	R250 – R400	1.5 t/m³

Sand Usage Rules of Thumb

Common SA construction sand requirements:

Bricklaying mortar: 0.5 m³ of building sand per 1,000 standard bricks (1:4 cement:sand mix)

Plastering: 0.015 m³ of plaster sand per m² at 15mm thickness (approx. 25kg per m²)

Paving bedding: 0.025 m³ of river sand per m² at 25mm thickness

Concrete (1:2:3 mix): 0.66 m³ of sand per m³ of concrete

Truck load: Standard tipper truck carries 6 m³ (approx. 9.6 tonnes)

Bulk vs Bag Sand in South Africa

For projects needing more than 1–2 m³, bulk delivery is almost always more economical. A 50kg retail bag costs R65–R85 (R1,300–R1,700/m³), compared to R400–R700/m³ for bulk delivery. However, bags are convenient for small patch repairs and garden projects where access for a truck is difficult.

Always add a 10% waste allowance to your calculated volume to account for spillage, compaction settling, and irregular ground surfaces.

Need full precision?

🔬 Professional Calculator Complete parameters, sensitivity analysis, and detailed breakdown

Waste / Over-order Factor (%)

Typical: 10% for sand. Add more for tricky sites.

Project Sand Requirements

Foundation Fill6.60 m³

Qty (m³)

Sand Type

Est. Cost

R 1 650 – R 2 640

Volume of sand needed to fill foundation trench/slab sub-base

Bricklaying Mortar (per 1000 bricks)2.75 m³

Qty (× 1,000 bricks)

Sand Type

Est. Cost

R 1 100 – R 1 650

Approx 0.5m³ of building sand per 1,000 bricks laid

Plastering (15mm thick)1.98 m³

Qty (m²)

Sand Type

Est. Cost

R 990 – R 1 386

Plaster sand at 15mm thickness per m² of wall area

Paving Bedding (25mm)

River sand bedding layer at 25mm per m² of paving

Total Project Sand Budget

R 3 740 – R 5 676

Total Volume

11.33 m³

Total Weight

18.13 tonnes

Truck Loads (6m³)

2 trucks

SAND TYPE BREAKDOWN

Type	Volume (m³)	Price Range
Fill Sand	6.60	R 1 650 – R 2 640
Building Sand	2.75	R 1 100 – R 1 650
Plaster Sand	1.98	R 990 – R 1 386

Note: Prices based on SA averages (2026). Bulk delivery prices vary by region and order size. Always get 3 quotes from local suppliers. Prices exclude delivery.

Frequently Asked Questions — Sand Calculator SA

Multiply Length (m) × Width (m) × Depth (m) to get the volume in cubic metres. Then multiply by 1.6 for the weight in tonnes. For example: a 5m × 3m patio at 50mm depth = 5 × 3 × 0.05 = 0.75 m³ = 1.2 tonnes. Our calculator does this automatically and adds bag counts and cost estimates.

Building sand is coarser and suitable for bricklaying mortar and general fill. Plaster sand is fine-grained, washed, and used for plastering walls and ceilings to achieve a smooth finish. Using the wrong sand type leads to weak mortar joints or rough plaster finishes. Always specify the correct type when ordering.

A cubic metre of dry sand weighs approximately 1.6 tonnes (1,600 kg). Wet sand can be heavier at 1.8–2.0 t/m³. This matters for truck load calculations — a standard 6 m³ tipper carries about 9.6 tonnes of dry sand.

One cubic metre of sand weighs about 1,600 kg, so you need approximately 32 bags of 50kg sand per m³. At R65–R85 per bag retail, that's R2,080–R2,720 per m³ — much more expensive than bulk delivery at R400–R700/m³. Bags are best for small quantities under about 0.5 m³.

2026 South African bulk sand prices: Fill sand R250–R400/m³; River sand R350–R500/m³; Building sand R400–R600/m³; Plaster sand R500–R700/m³. Prices exclude delivery, which typically adds R300–R800 depending on distance. Gauteng and Western Cape prices tend to be higher than KZN and Limpopo.

Sand Calculator South Africa

How to Use the Sand Calculator

Types of Sand Used in South African Construction

Sand Usage Rules of Thumb

Common SA construction sand requirements:

Bulk vs Bag Sand in South Africa

Frequently Asked Questions — Sand Calculator SA

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