Free Online Calculators
Use this free paver sand estimator to instantly find how many bags of polymeric jointing sand your project needs. Enter your area, joint width, and paver thickness and get an accurate result in seconds. Works for all major brands: Dominator, Techniseal, Alliance Gator, Gator Maxx, EZ Sand, and Unilock.
Formula: Total Bags = Total Area (sq ft) ÷ Coverage per Bag, then add 10–15% buffer
Measure with a ruler - do not estimate by eye
Polymeric sand — also called polymeric jointing sand or paver joint sand — is a fine sand blended with silica polymers and binding additives. You sweep it into the gaps between pavers, then activate it with water.
When the water hits the polymers, they bond together and the sand hardens into a firm, durable filler. Regular sand simply cannot do this.
Polymeric sand does four things regular sand cannot:
Brands like Alliance Gator, Techniseal, Dominator, Unilock, and EZ Sand each produce polymeric sand with slightly different polymer concentrations and coverage rates. Always check your bag label — it overrides any general estimate.
Measure the total length and width of your patio, walkway, or driveway in feet. Multiply them together to get square footage. For L-shaped or irregular areas, split into rectangles, calculate each section, then add totals.
Example: 20 ft × 15 ft = 300 sq ft
Slide a ruler into a typical joint. Do not guess. Joint width is the single biggest factor in sand quantity — a ½" joint needs roughly double the sand of a ¼" joint on the same area.
Most concrete pavers are 2⅜" thick (60 mm). Thicker pavers create deeper joints that hold more sand. This directly changes your quantity per square foot.
Use the coverage table below. Round up to the nearest whole bag, then add 10–15% for waste.
Polymeric sand is shelf-stable when stored dry, so a few extra bags cost far less than a second trip mid-project.
| Joint Width | Paver Thickness | Coverage per 50 lb Bag | Common Use |
|---|---|---|---|
| ⅛" (3 mm) | 2"–3" | 75–100 sq ft | Tight concrete pavers, large-format slabs |
| ¼" (6 mm) | 2"–3" | 60–75 sq ft | Standard residential concrete pavers |
| ⅜" (10 mm) | 2"–3" | 30–60 sq ft | Tumbled concrete pavers |
| ½" (12 mm) | 2"–3" | 15–30 sq ft | Wide joints, rustic pavers |
| ¾"–1" | 1"–2" | 8–15 sq ft | Natural flagstone, irregular stone |
| 1"+ | 1"–2" | 5–8 sq ft | Very wide flagstone gaps |
These are general industry estimates. Your specific product label is the most accurate source — always verify before purchasing.
Bags Needed = Total Area (sq ft) ÷ Coverage per Bag × Buffer (1.10–1.20)
Flagstone projects need a different approach because joint widths vary widely across the same patio, stone thickness varies (1"–3"), and irregular shapes create more total joint area per square foot.
Follow these steps for flagstone:
Rule of thumb: plan for one 50 lb bag per 8–15 sq ft of natural flagstone surface. Use a wide-joint rated product like Dominator for gaps over ½" — standard narrow-joint polymeric sand will not perform well in large flagstone gaps.
Doubling the joint width more than doubles the sand needed, because volume increases in three dimensions. Always measure with a ruler — do not estimate by eye.
Thicker pavers create deeper joints. A 3" thick paver needs about 50% more sand per linear foot of joint than a 2" paver at the same joint width.
Small brick pavers (4"×8") have far more joints per square foot than large-format slabs (24"×24"). More joints means more sand per surface square foot, even at the same joint width.
Tumbled pavers have rounded, irregular edges that create wider effective joints than their nominal measurement. Add 15–20% extra when using tumbled pavers.
Refilling existing joints on an older project needs far less sand than a brand-new installation with completely empty joints. For top-ups, estimate 25–50% of the new-installation quantity.
| Brand | Joint Range | Coverage (50 lb bag) | Best For |
|---|---|---|---|
| Alliance Gator / Gator Maxx Nitro | ⅛"–1.5" | 30–100 sq ft | Most residential paver types |
| Techniseal | ⅛"–⅝" | 40–80 sq ft | Standard and tumbled pavers |
| Dominator Polymeric Sand | ¼"–3" | 10–75 sq ft | Flagstone, wide joints, large-format |
| EZ Sand | ⅛"–¼" | 75–100 sq ft | Narrow joints on standard pavers |
| Unilock | ⅛"–¼" | 75–100 sq ft | Unilock paver systems |
| Generic / store brand | ¼"–½" | 30–60 sq ft | Budget residential projects |
Brand coverage rates may change between product generations. Always verify on the bag label before purchasing.
Getting the quantity right is step one. Correct application ensures the sand bonds properly.
— pavers must be completely dry before application or sand will clump on the surface
— sweep sand into all joints using a push broom
— fill to within ¼" of the paver surface, not flush to the top
— run a plate compactor over the surface twice to settle sand deep into joints
— use a leaf blower on low to remove surface sand before wetting; leftover sand on paver faces leaves a haze
— mist gently for 30 seconds, wait 5 minutes, repeat 2–3 times; avoid a heavy stream
— no foot traffic for 24 hours; no vehicles for 48–72 hours
— do not apply if rain is expected within 24 hours
— even a small error here causes large quantity mistakes. Always use a ruler.
— running short mid-project is costly and dye lots can vary between batches. Always buy 10–15% extra.
— fine polymeric sand for narrow joints will not fill wide flagstone gaps. Always match the product to your joint width.
— this guide gives industry-standard estimates. Your specific product may state 65 or 80 sq ft per bag. Use whatever your label states.
— moisture before activation prevents proper bonding and causes permanent surface haze.
| Your Unit | Convert to Sq Ft | Example |
|---|---|---|
| Square yards | Multiply by 9 | 50 yd² × 9 = 450 sq ft |
| Square inches | Divide by 144 | 7,200 in² ÷ 144 = 50 sq ft |
| Square meters | Multiply by 10.764 | 30 m² × 10.764 = 323 sq ft |
| Circular patio | π × radius² | 10 ft radius → 3.14 × 100 = 314 sq ft |
Most polymeric sand sells in 50 lb bags. Some brands offer 40 lb or 80 lb options.
Total pounds = Bags needed × Bag weight
Example: 8 bags × 50 lb = 400 lbs of polymeric sand
If your supplier sells by weight in bulk, use this number directly for your order.
| Feature | Polymeric Sand | Regular / Dry Sand |
|---|---|---|
| Hardens after wetting | Yes | No |
| Weed resistance | High | Low |
| Ant infestation resistance | High | Low |
| Washout resistance | High | Low |
| Drainage | Limited | Good |
| Lifespan | 10–15 years | 1–5 years |
| Cost | Higher | Lower |
| Best for | Patios, driveways, walkways | Garden stepping paths, casual use |
Whether you are using the Dominator calculator, the Techniseal calculator, the Alliance Gator calculator, or estimating manually — the formula stays the same. The only variable is the coverage rate your specific product provides.
Measure accurately, match your product to your joint width, add buffer stock, and you will have exactly the right amount of jointing sand to finish your paver project correctly the first time.