TryBuildCalcBuilding Sand Weight Calculator (Soft Sand for Mortar & Bricklaying)
Estimate building sand bags and tonnes.
🕒 Last updated: August 19, 2026
Inputs
ℹ️Auto-filled by sand type. Use supplier-tested density when available.
ℹ️Enter your supplier rate. Market price is not estimated.
0.50 m³
17.66 ft³ • 0.65 yd³ • 500 litres
Building Sand / Soft Sand
800 kg
0.80 tonnes
864 kg
0.86 tonnes • +8% wastage included
35 bags
Based on 25 kg bag
0.2 loads
1 full load(s), based on 5.00T capacity
Density Used: 1,600 kg/m³
Moisture: Dry
Standards: IS 383 / ASTM C33 / BS EN 12620
Sand Quantity Visualizations
Weight Breakdown
How Much Sand Is That?
Building sand for mortar work
Building sand is a fine, workable sand commonly used for bricklaying mortar.
Small projects often order it in 25 kg bags, while larger jobs use bulk delivery.
- 25 kg bags selected.
- Default volume: 0.5 m³.
- Wastage set to 8% for handling and batching.
How Is Sand Weight Calculated?
Sand weight is calculated by first converting the measured area or entered volume into cubic metres. Then the calculator adjusts for sand bulking, compaction, moisture, wastage, and delivery units such as tonnes, bags, and vehicle loads.
Step 1 — Calculate Sand Volume
From dimensions: Volume (m³) = Length × Width × Depth
Depth in mm: Depth (m) = Depth (mm) ÷ 1000
Depth in cm: Depth (m) = Depth (cm) ÷ 100
Depth in inches: Depth (m) = Depth (in) × 0.0254
Depth in feet: Depth (m) = Depth (ft) × 0.3048
From direct volume: ft³ ÷ 35.315 = m³
From direct volume: yd³ × 0.7646 = m³
From direct volume: litres ÷ 1000 = m³
Volume is the space that sand has to fill. If dimensions are entered, all dimensions are first converted to metres. If direct volume is entered, the calculator converts that volume into cubic metres.
Step 2 — Apply Bulking Correction
True Dry Volume = Measured Damp Volume ÷ (1 + Bulking Factor)
Example: If bulking is 30%, use factor 0.30
Bulking applies only when damp sand is measured by volume. Damp fine sand can occupy 20–40% more volume without adding the same proportion of dry sand. If sand was measured in a damp state, the calculator reduces the measured volume to its true dry-volume equivalent.
Step 3 — Apply Compaction Factor
Loose Volume Required = Dry Volume × (1 + Compaction % ÷ 100)
If the sand layer will be compacted after placing, extra loose sand is required. This is common for bedding sand, plinth filling, trench filling, and sub-base preparation.
Step 4 — Convert Volume to Dry Weight
Dry Weight (kg) = Loose Volume (m³) × Bulk Density (kg/m³)
Bulk density is the weight of sand per cubic metre, including air gaps between grains. It is not the same as particle density or specific gravity.
Step 5 — Apply Moisture Factor
Adjusted Weight = Dry Weight × Moisture Factor
Dry sand factor = 1.00
Damp sand factor = usually 1.08 to 1.15
Wet sand factor = usually 1.20 to 1.30
Damp or wet sand weighs more than dry sand for the same dry volume. If the supplier delivers sand by weight, moisture can reduce the actual dry sand volume received per tonne.
Step 6 — Add Wastage
Wastage Allowance = Adjusted Weight × (Wastage % ÷ 100)
Order Quantity = Adjusted Weight + Wastage Allowance
Wastage covers handling loss, unloading loss, spreading variation, wind loss for fine sand, and material left on the vehicle or site surface.
Step 7 — Convert to Delivery Units
Tonnes = Order Quantity (kg) ÷ 1000
Bags = Order Quantity (kg) ÷ Bag Size (kg), rounded up
Loads = Order Quantity (kg) ÷ Vehicle Capacity (kg), rounded up
Cost = Tonnes × Price per Tonne
Final order quantity is converted into practical delivery units so users can discuss the result with suppliers in tonnes, bags, or vehicle loads.
Real-World Sand Weight Calculation Example
This example uses the active calculator inputs and follows the same seven steps from the formula section. Each table shows the value used, the formula applied, and the result produced.
Input Values Used
| Input | Value | Why it is used |
|---|---|---|
| Sand type | Building Sand / Soft Sand | Used to select practical bulk density |
| Direct volume | 0.5 m³ | Entered volume converted to cubic metres |
| Bulking correction | Not applied | Corrects damp sand volume to true dry-volume equivalent |
| Compaction factor | 0% | Adds loose sand needed before compaction |
| Bulk density | 1,600 kg/m³ | Converts sand volume into dry weight |
| Moisture condition | DRY / factor 1.00 | Adjusts weight for damp or wet sand |
| Wastage factor | 8% | Allows for handling, unloading, and spreading loss |
Step 1 — Calculate Sand Volume
First, the calculator converts the entered dimensions or direct volume into cubic metres. Cubic metres are used because sand bulk density is normally given in kg/m³.
| Calculation | Formula / Substitution | Result |
|---|---|---|
| Measured volume | 0.5 m³ converted to m³ | 0.500 m³ |
Step 2 — Apply Bulking Correction
Bulking correction is used only when damp sand is measured by volume. Damp sand may appear to occupy more volume because moisture pushes fine sand particles apart. The calculator converts that measured damp volume into true dry-equivalent volume.
| Calculation | Formula / Substitution | Result |
|---|---|---|
| True dry volume | Bulking correction not applied | 0.500 m³ |
Step 3 — Apply Compaction Factor
If sand will be compacted after placing, extra loose volume is needed. The compaction factor estimates the additional loose sand required to achieve the final compacted layer.
| Calculation | Formula / Substitution | Result |
|---|---|---|
| Loose volume required | 0.500 × (1 + 0 ÷ 100) | 0.500 m³ |
Step 4 — Convert Volume to Dry Weight
Dry weight is calculated by multiplying loose sand volume by bulk density. Bulk density represents the weight of sand per cubic metre, including air voids between grains.
| Calculation | Formula / Substitution | Result |
|---|---|---|
| Dry weight | 0.500 × 1,600 | 800 kg |
| Dry weight in tonnes | 800 ÷ 1000 | 0.80 tonnes |
Step 5 — Apply Moisture Factor
Moisture increases the measured weight of sand. This step adjusts the dry weight based on the selected moisture condition.
| Calculation | Formula / Substitution | Result |
|---|---|---|
| Moisture adjusted weight | 800 × 1.00 | 800 kg |
| Adjusted weight in tonnes | 800 ÷ 1000 | 0.80 tonnes |
Step 6 — Add Wastage
Wastage is added after moisture adjustment because the order quantity should include expected site handling and placement losses.
| Calculation | Formula / Substitution | Result |
|---|---|---|
| Wastage allowance | 800 × (8 ÷ 100) | 64 kg |
| Order quantity | 800 + 64 | 864 kg |
Step 7 — Convert to Delivery Units
Finally, the order quantity is converted into tonnes, bags, vehicle loads, and cost so it can be used for actual procurement.
| Calculation | Formula / Substitution | Result |
|---|---|---|
| Tonnes | 864 ÷ 1000 | 0.86 tonnes |
| Bags | 864 ÷ 25 | 34.56 bags → order 35 bags |
| Vehicle loads | 864 ÷ 5,000 | 0.17 loads → plan 1 load(s) |
Therefore, the required sand order quantity is 864 kg, or 0.86 tonnes, after bulking correction, compaction, moisture adjustment, and wastage.
Calculator Limitations & Assumptions
- Bulk density values are typical ranges, not quarry-specific. Local sand may differ by 5-10% because of mineral composition, grading, and particle shape. For critical or large projects, obtain a supplier-tested bulk density.
- The bulking correction is approximate. Actual bulking depends on grain-size distribution and exact moisture content, both of which vary by source. Treat the correction as guidance rather than a precision site test.
- Dimension mode assumes a rectangular length x width x depth volume. Divide L-shaped, curved, triangular, or irregular areas into simple sections, add their volumes, and use Direct Volume mode.
- This calculator estimates order quantity and does not specify the correct sand for structural work. Concrete, mortar, plaster, and screed have different grading requirements. Refer to standards such as IS 456, ACI 211, BS 8500, or AS 3600 for design requirements.
- Unwashed sea sand contains chloride salts that can corrode reinforcing steel and cause masonry efflorescence. Never use unwashed sea sand in reinforced concrete or near metal fixings. The sea-sand option is intended only for properly washed and approved material.
- Cost is calculated only from the entered price per tonne. Delivery, GST or VAT, taxes, loading charges, minimum-order fees, and other supplier surcharges are not included.
Disclaimer: This calculator provides approximate results for planning and estimation purposes only. Actual requirements may vary based on site conditions, materials, workmanship, and local building regulations. Always consult a qualified engineer, architect, or construction professional before making final decisions.