Polymeric Sand Calculator — Bags by Paver & Joint
Polymeric sand coverage depends heavily on paver size and joint width — small pavers with wide joints burn through it. Pick your paver type and area to get an accurate bag count.
How to use this calculator
- Enter the total paver area in square feet.
- Choose the option that matches your paver size and joint width — this drives coverage more than anything.
- Sweep sand into dry joints, compact, sweep again, then mist lightly to activate the polymers.
- Work only in dry weather; rain before it cures ruins polymeric sand.
The formula
Coverage is set by how much joint volume there is to fill, which depends on paver size and joint width.
Bags = area ÷ coverage per bag. A 50 lb bag covers roughly 80 sq ft of standard pavers with tight joints, but as little as 25 sq ft for irregular flagstone with wide joints.
Deeper joints (thicker pavers) also use more, so round up.
Worked example
200 sq ft of standard pavers with narrow joints.
Coverage ≈ 80 sq ft per 50 lb bagBags = 200 ÷ 80 = 2.5 → 3 bags
You need 3 bags of 50 lb polymeric sand for 200 sq ft of tightly jointed pavers.
Frequently asked questions
How much polymeric sand do I need?
A 50 lb bag covers about 80 sq ft of standard pavers with narrow joints, dropping to ~25–35 sq ft for wide or irregular joints. Divide your area by the right coverage and round up.
Why does joint width matter so much?
Polymeric sand fills the gaps between pavers, not the paver faces. Wider and deeper joints hold far more sand, so the same area can need two or three times as many bags.
Can I apply polymeric sand in the rain?
No. It must go down in dry joints and cure in dry weather. Rain or moisture before it sets causes hazing and a weak, crumbly joint that has to be redone.