Sand Calculator
About Sand Calculation
The Sand Calculator converts site dimensions and layer thickness into sand volume (m³), weight (kg) and an optional cost estimate. Choose a shape (Length × width, Area, Circle, or Irregular shape with 4 sides), set thickness in centimetres, and select Dry, Moist or a custom density in kg/m³. The tool can act as a quick sand estimator for landscaping, paving beds, playgrounds, backfill and other projects where only the metric system is used.
Tips and Tricks
- Pick the right shape. For rectangles enter length and width in cm. If you already know the area, use Area (m²). For round features choose Circle and enter the diameter in cm. For uneven plots, Irregular shape (4 sides) uses the average:
((Side 1 + Side 2)/2) × ((Side 3 + Side 4)/2). - Layer thickness. Common values: paving bed 3-5 cm, lawn leveling 1-2 cm, patio/shed base 5-10 cm, sandbox or fall protection 15-30 cm. Increase thickness for weak subgrade or heavy loads.
- Density choice. Typical ranges: Dry sand ≈ 1500-1650 kg/m³; Moist sand ≈ 1750-1950 kg/m³. Use Custom density if you have a lab/test value for your material.
- Compaction & losses. Enable Add 10% for settlement to cover compaction, trimming and waste. Many site specs allow 8-12% reserve; 10% is a practical default.
- Coverage from 1 m³. A quick rule:
coverage (m²) = 100 / thickness (cm). Examples: 1 m³ covers ~33.3 m² at 3 cm, 20 m² at 5 cm, 10 m² at 10 cm, 6.7 m² at 15 cm. - Bags of sand. The calculator gives weight in kilograms. To estimate bags, divide by the bag size:
bags = weight (kg) / bag size (kg)(e.g., 25 kg bags), then round up. - Costs. Enter a price per tonne or per m³ to get a total. Remember that delivery, loading and disposal fees are usually separate.
- Standards. For European material specifications and workmanship consult the relevant EN documents, such as EN 13242 (unbound aggregates), EN 13139 (aggregates for mortar), EN 12620 (aggregates for concrete) and compaction principles in the EN 13286 series.
| Thickness, cm | Approx. area covered by 1 m³, m² |
|---|---|
| 3 | 33.3 |
| 5 | 20 |
| 10 | 10 |
| 15 | 6.7 |
FAQs
How much sand do I need?
Enter your area and layer thickness; the sand volume calculator multiplies them to give m³ and converts to kilograms using the selected density. For irregular plots, use the 4-side option and the tool will average opposite sides automatically.
Can I use this as a fill sand calculator for trenches or backfill?
Yes. Measure the trench length and width (or diameter if circular), set the required thickness or lift height, choose Moist density for compacted fill, and enable the 10% reserve to account for settlement.
What density should I choose—dry or moist?
Use Dry (≈1500-1650 kg/m³) for loose, stored sand and Moist (≈1750-1950 kg/m³) for damp or compacted material. If your supplier provides a different test value, select Custom density and enter it directly.
How many bags of sand do I need?
After calculation, take the Sand weight result in kg and divide by the bag size (for example, 25 kg). Always round up and consider an extra bag when precise leveling is required.
Does this also work as a sand coverage calculator?
Yes. If you know the available volume, invert the rule: area (m²) = volume (m³) × 100 / thickness (cm). This helps check “how much sand will I need” against a target coverage in square metres.