Calculated result
3bags
Bags to buy
Formula
LND-PSN-001patio area × (1 + waste) ÷ coverage per bag
120 ft²
Patio area
132 ft²
Area including waste
Landscaping calculator
Polymeric sand calculator
a 12 × 10 ft patio at 50 ft² per bag with 10% waste rounds to 3 bags. In metric, patio area is 11.15 m².
Formula. patio area × (1 + waste) ÷ coverage per bag
Bag count of joint sand from patio area and the coverage printed on the polymeric-sand bag.
By Feroz Sheikh · Formula LND-PSN-001 v1.0.0 · Tested formula
Formula
LND-PSN-001v1.0.0Project inputs
Enter your measurements. Switching units converts the same project, including coverage and unit rates. Package yields keep the unit printed beside each field.
Refine measurements and rates at any time. Your current values are included in the material-list PDF.
Planning estimate, not engineering advice. Confirm site measurements and product specifications. Calculation limits.
Divide patio area by the coverage printed on the polymeric-sand bag, then apply sweep-off allowance before whole-bag rounding.
- Measure the finished paved face after cuts.
- Enter the coverage from the bag you will buy. Joint width and paver size change it a lot.
- Plan a second pass after the first watering. That is what the waste field is for.
Add your project costs
Enter supplier prices and any labour, equipment or delivery costs. Pick a currency — badges, inputs, and totals follow.
Costs use the bulk-yard, bag or truck-load rate you type. Construclytic does not fetch quarry or nursery prices. Delivery, fabric and edging stay separate lines.
How this calculator works
A transparent polymeric sand takeoff.
Feroz SheikhWritten and reviewed by Feroz Sheikh · founder
Divide patio area by the coverage printed on the polymeric-sand bag, then apply sweep-off allowance before whole-bag rounding.
LND-PSN-001 counts bags from patio area and the coverage printed on the polymeric-sand bag. Joint width and paver size change that coverage — use the label for the joint you will actually strike.
Worked example. Example: a 12 × 10 ft patio at 50 ft² per bag with 10% waste rounds to 3 bags.
See the example inputs and calculated result
This separate example uses the calculator's starting values in imperial units. It stays unchanged when you edit the tool above. Example rates, yields and dimensions are assumptions, not recommendations for your project.
| Input | Example value |
|---|---|
| Patio length | 12 ft |
| Patio width | 10 ft |
| Coverage per bag | 50 ft² / bag |
| Waste factor | 10 % |
Example result: Bags to buy — 3 bags.
patio area × (1 + waste) ÷ coverage per bag
Use the labelled units above when reproducing this example. To work in metric, switch the calculator to Metric; applicable measurements are converted, while product-specific units remain labelled.
- 1. Measure the finished paved face after cuts.
- 2. Enter the coverage from the bag you will buy. Joint width and paver size change it a lot.
- 3. Plan a second pass after the first watering. That is what the waste field is for.
Field notes that change the number
- A 12×12 paver with a 3/16 in joint is not a 4×8 brick with a 3/8 in joint.
- Enter the labelled coverage, then waste for wash-off.
- Regular joint sand is a different product.
Common mistakes
- Using base tons as sand bags.
- Ignoring the joint-width column on the bag.
- Treating this as a sealer warranty.
Need the broader workflow? Read the landscaping planning guide.
Questions
Questions about polymeric sand
Why not calculate from joint width?
Joint volume varies with chamfer and bedding. The bag coverage is the number you will actually purchase against. Change it when the label changes.
Regular jointing sand?
Same area math. Use the coverage the sand supplier prints, which is often higher than polymeric.
What is the formula ID?
This polymeric sand calculator publishes formula LND-PSN-001, version 1.0.0. The ID stays on the result and on the estimate line.