Updated
March 27, 2026
Reviewed against the current calculator logic, structured content, and internal linking used on BuildCostLab.
Patio bedding tool
Paving Sand Calculator
Estimate bedding sand volume, tonnage, and rough cost for patios, slabs, and block paving prep.
Methodology
Planning-first estimate
Use this calculator to build a rough material estimate, then confirm it against product data, site conditions, and supplier buying formats before you order.
Trust
How we publish
See the calculator methodology and editorial policy for the standards behind these pages.
Assumptions
Volume calculators assume the job can be reduced to length, width, depth, and a practical density or buying-unit conversion.
Common mistakes
Depth mistakes are the biggest problem, followed by using the wrong density and forgetting that loose and compacted materials do not behave identically.
Best use cases
Best for aggregates, soils, screeds, and fill materials where the order usually starts with volume, then converts into tonnes, bags, or bulk units. On this page, that usually means turning simple measurements into a more practical material order.
How to get a better estimate
Check whether the depth entered is the installed depth or the loose-delivered depth, because the difference can materially change the order.
Before you buy
Bag and bulk pricing can diverge quickly once the quantity grows, so use the output to compare the real delivered buying route, not just a headline unit cost.
UK and US note
UK and US buyers often use different unit language and pack conventions, but the geometry, waste, and whole-unit rounding logic are still the foundation.
Final buying check
Before placing an order, compare the assumed depth, density, buying-unit size, delivery access, and whether bulk supply is more realistic than bagged buying.
Explore this topic cluster
Open the full Paving and Patio Estimating hub to move from quick estimate to deeper guidance.
How do I use the Paving Sand Calculator?
Enter the measured dimensions and depth, choose a realistic waste setting, and use this calculator to compare the likely buying quantity before you choose bags, bulk, or tonnage-based supply.
What most affects the Paving Sand Calculator result?
Depth mistakes are the biggest problem, followed by using the wrong density and forgetting that loose and compacted materials do not behave identically.
Should I round the result up?
Bag and bulk pricing can diverge quickly once the quantity grows, so use the output to compare the real delivered buying route, not just a headline unit cost.