Your Result Explained: What These Numbers Mean
A long-lasting paver patio or walkway is a three-layer structural system: the interlocking pavers on top, a uniform 1-inch screeded layer of coarse ASTM C33 concrete bedding sand in the middle, and a 4- to 6-inch compacted sub-base of dense-graded crushed stone (crusher run / DGA) at the bottom. Ordering pavers without simultaneously calculating the underlying tons of base gravel and bedding sand is the #1 reason weekend patio builds stall.
In the green highlight box at the top of the results panel, you will see your exact Paver Stones Needed, Polymeric Joint Sand bags, Compacted Base Gravel (in cubic yards and short tons), and Screeded Bedding Sand (in cubic yards and 50-lb bags). The four main summary cards below display the combined sub-base + bedding sand aggregate volume and total project weight so you can plan delivery.
Worked Example: Building a 12 ft × 16 ft Patio with 4"×8" Brick Pavers
You are installing a 192-square-foot backyard patio (16 ft × 12 ft) using standard 4"×8" Holland brick pavers over a 4-inch compacted crusher-run base and 1-inch screeded concrete sand bed, with a 10% allowance for cuts and compaction.
- Calculate patio area: 16 ft × 12 ft = 192 square feet.
- Compute 4"×8" pavers (4.5 pavers/sq ft) + 10% waste: 192 × 4.5 × 1.10 = 950.4 → 951 pavers.
- Compute 4" gravel base volume (+10% compaction): 192 × (4 ÷ 12) × 1.10 = 70.40 cu ft = 2.61 cubic yards.
- Convert gravel base to short tons (at 1.40 tons/yd³): 2.61 yd³ × 1.40 = 3.65 tons.
- Compute 1" bedding sand volume (+10%): 192 × (1 ÷ 12) × 1.10 = 17.60 cu ft = 0.65 cubic yards (36 bags of 50 lb sand).
- Compute polymeric jointing sand (~1 bag per 60 sq ft): Ceiling(192 ÷ 60) = 4 bags (50 lb).
Result Summary: Order 951 brick pavers (4"×8"), 3.65 tons (2.61 yd³) of crusher-run base gravel, 0.65 yd³ (36 bags) of coarse bedding sand, and 4 bags of polymeric joint sand.
How This Is Calculated (Formulas & Measurement Guide)
We divide your patio square footage by the face area of a single paver (in square feet) and add your cut-waste factor. Simultaneously, we calculate the prism volume of the compacted aggregate base layer and the 1-inch bedding sand layer.
Pavers = Ceiling([Area (sq ft) ÷ (Paver Width × Length ÷ 144)] × (1 + Waste%)) Dividing paver dimensions in square inches by 144 converts each brick into square feet.
Layer Yards = [Area (sq ft) × (Layer Depth in inches ÷ 12) × (1 + Waste%)] ÷ 27 Computes separate cubic yardage and tonnage for the 4"–6" crusher run base (2,800 lbs/yd³) and 1" concrete sand bed (2,700 lbs/yd³).
How to Measure Irregular Areas & Curved Borders
Per ICPI guidelines, always excavate your gravel base trench 6 inches wider than the finished paver edge on all sides (adding 1 foot to both length and width for the gravel base) so the plastic or aluminum edge restraint spikes sit on solid compacted stone rather than soft lawn dirt.
Practical Tips & Common Mistakes to Avoid
Field-Tested Planning Tips
Keep Screeded Bedding Sand Strictly at 1 Inch (Never Over 1.5 Inches)
Beginners often try to level an uneven gravel base by laying 2 to 3 inches of sand. Thick sand layers shift under foot traffic and create ankle-twisting depressions. Get your gravel sub-base flat within ±3/8 inch first, then screed a uniform 1-inch sand bed using two 1-inch outside-diameter steel pipes as rails.
Compact Gravel Base in 2-Inch to 3-Inch Lifts
A residential vibratory plate compactor cannot compact 6 inches of loose crusher run in a single pass. Spread 2 to 3 inches of stone, mist lightly with water, compact in two perpendicular passes, and then add the second lift.
Use Coarse Washed ASTM C33 Concrete Sand—Never Fine Masonry Sand
Fine play sand or mortar sand has tiny rounded grains that wash out into the gravel base during heavy rain. Specify coarse washed concrete sand (ASTM C33) for bedding and polymeric sand for sweeping into the top joints.
Pull Pavers from Multiple Bundles Simultaneously
Concrete pavers have slight batch-to-batch color shading. Pulling bricks vertically from 2 or 3 open cubes at the same time blends any color variations seamlessly across the patio.
Common Ordering & Installation Mistakes
Mistake Using clean #57 drainage stone without fines as a paver patio base (traditional build)
Recommended Fix: In standard traditional builds, use dense-graded aggregate (crusher run / road base with stone dust fines) so it locks tight under a plate compactor. If using an open-graded #57 base, you must choke the surface with #8/#9 chip stone instead of sand so sand does not migrate down into the voids.
Mistake Misting polymeric sand before blowing every dust speck off the paver tops
Recommended Fix: Any polymeric sand dust left on the textured top of the pavers when you spray water will cure into a permanent hazy glue film. Run the plate compactor, sweep again, and use a leaf blower thoroughly before misting.
Mistake Skipping perimeter edge restraints along lawn borders
Recommended Fix: Without staked PVC/aluminum paver edging spiked into the extended gravel base every 12 inches, outer border pavers will creep outward and open wide gaps within one season.
Standard Modular Paver Sizes & Coverage per 100 Sq Ft (ICPI Reference)
Coverage rates for standard interlocking concrete and clay brick pavers, plus 10% cutting waste allowance:
| Paver Dimension | Area per Paver | Pavers per Sq Ft | Net per 100 Sq Ft | With 10% Cut Waste | Weight / Sq Ft |
|---|---|---|---|---|---|
| 4" × 8" Holland Brick | 0.222 sq ft | 4.50 pavers | 450 pavers | 495 pavers | ~28 lbs/ft² |
| 6" × 6" Square Paver | 0.250 sq ft | 4.00 pavers | 400 pavers | 440 pavers | ~28 lbs/ft² |
| 6" × 9" Rectangle Paver | 0.375 sq ft | 2.67 pavers | 267 pavers | 294 pavers | ~28 lbs/ft² |
| 8" × 8" Large Square | 0.444 sq ft | 2.25 pavers | 225 pavers | 248 pavers | ~28 lbs/ft² |
| 12" × 12" Step Slab | 1.000 sq ft | 1.00 paver | 100 pavers | 110 pavers | ~24 lbs/ft² |
Reference Source: Interlocking Concrete Pavement Institute (ICPI) Tech Spec 2 & ASTM C936 Standard Specification for Solid Concrete Interlocking Paving Units. Stone dust fines fill voids between 3/4" stones, increasing compacted density.
Frequently Asked Questions (Paver Calculator (with Base & Sand))
How many 4x8 pavers do I need per square foot?
A standard 4" × 8" brick paver covers 32 square inches (0.222 square feet), so you need exactly 4.5 pavers per square foot before waste (450 pavers per 100 sq ft net, or 495 pavers with 10% cutting waste).
How deep should the gravel base be for a paver patio vs. a driveway?
For pedestrian patios and garden walkways on well-drained soil, ICPI recommends at least 4 inches of compacted crusher-run base (6 inches in heavy clay or northern freeze-thaw zones). For vehicular driveways, install 6 to 12 inches of compacted aggregate base.
How much bedding sand do I need for 100 square feet of pavers?
At the standard 1-inch screeded thickness, 100 square feet requires 8.33 net cubic feet (0.31 cubic yards, or about 0.42 tons) of washed concrete sand—which equals 17 to 19 fifty-pound bags.
How deep should I excavate in total for a paver patio?
Add your compacted base thickness (4.0") + bedding sand thickness (1.0") + paver thickness (2.375" for standard 60mm pavers) = 7.375 inches below your desired finished patio height.
How many square feet does a 50 lb bag of polymeric sand cover?
One 50-pound bag of polymeric jointing sand covers approximately 50 to 75 square feet for standard 4×8 rectangular pavers with narrow joints, or 25 to 40 square feet for wide-joint cobbles or flagstone.
Can I lay patio pavers over an existing concrete slab?
Yes, provided the concrete slab is structurally sound without frost heaving, slopes away from the house for drainage, and has core-drilled drainage weep holes at low points. Screed a 1/2" to 3/4" bed of coarse sand over geotextile fabric so sand cannot wash through expansion joints.
Worked Example Project Scenarios (Paver Calculator (with Base & Sand))
Explore pre-computed material takeoffs for popular residential project dimensions: