Paver Base Calculator: Gravel Depth, Tons & Aggregate Selection
Calculate tons of gravel for your paver base, compare #57 stone vs crusher run, and apply ICPI's 4-inch pedestrian / 6-inch driveway depth standards — with a step-by-step worked example.
Quick Answer
For a 200 sq ft patio at a 4-inch base, you need approximately 3.0 tons of #57 stone. Formula: 200 × 4 ÷ 12 = 66.7 cu ft ÷ 27 = 2.47 cu yd × 1.21 (tons/cu yd for #57 stone) = 3.0 tons. Per CMHA PAV-TEC-002 (formerly ICPI Tech Spec 2), base minimum is 4 inches pedestrian / 6 inches residential driveway. Add 1 inch ASTM C33 bedding sand.
For paver count, waste factor, and a full material bundle, use the Paver Calculator →
Paver Base Depth by Application — ICPI Standard
ICPI Tech Spec 2 (February 2020 edition) sets the baseline base depths for residential interlocking concrete pavement. Cold-climate adjustments add 2 to 4 inches for freeze-thaw zones.
| Application | Base Depth (ICPI Tech Spec 2) | Cold-Climate Add | Total (cold climate) |
|---|---|---|---|
| Pedestrian patio | 4 inches | +2–4 inches | 6–8 inches |
| Sidewalk / walkway | 4 inches | +2–4 inches | 6–8 inches |
| Residential driveway | 6 inches | +2–4 inches | 8–10 inches |
| Bedding sand (all types) | 1 inch (ASTM C33 — see CMHA PAV-TEC-002) | — | 1 inch |
| Drainage slope minimum | ¼ inch per foot (ICPI) | — | Away from structure |
Source: ICPI Tech Spec 2 (February 2020 edition). Cold-climate adjustment applies to zones with freeze-thaw cycles or continuously wet soils. Commercial loading (heavy vehicles) is governed by ICPI Tech Spec 4 — consult a licensed engineer.
How to Calculate Tons of Gravel for a Paver Base
The weight factor differs by aggregate type: #57 stone weighs approximately 2,410 lb per cubic yard (1.21 tons/cu yd); crusher run weighs approximately 2,700–2,800 lb per cubic yard (1.5 tons/cu yd). Using the wrong factor leads to under-ordering.
Step 1 — Cubic feet:
cu_ft = area_sqft × (base_depth_inches ÷ 12) Step 2 — Cubic yards:
cu_yd = cu_ft ÷ 27 Step 3 — Tons (#57 stone):
tons = cu_yd × 1.21 Step 3 — Tons (crusher run):
tons = cu_yd × 1.50 Add 10–15% for compaction shrinkage (loose vs compacted volume). Round up to nearest half-ton when ordering.
Worked Example — 200 sq ft Patio at 4-Inch Base
Project: 200 sq ft patio, ICPI 4-inch pedestrian base, choosing #57 stone.
cu_ft = 200 × (4 ÷ 12) = 200 × 0.333 = 66.7 cu ft
cu_yd = 66.7 ÷ 27 = 2.47 cu yd
tons (#57) = 2.47 × 1.21 = 3.0 tons
tons (crusher run) = 2.47 × 1.50 = 3.7 tons
With 15% compaction overage: order 3.5 tons of #57 stone, or 4.3 tons of crusher run. Plus 1 inch of ASTM C33 sand: 200 × (1 ÷ 12) ÷ 27 × 1.35 = approximately 0.83 tons of sand.
For the full bundle — paver count (4.5 pavers per sq ft × 200 sq ft = 900 pavers), edge restraint, and polymeric sand — use the Paver Calculator which applies these same ICPI formulas interactively.
#57 Stone vs Crusher Run: Choosing the Right Aggregate for Paver Base
The aggregate type determines drainage behavior, compaction density, and tons-per-cubic-yard. These two materials are not interchangeable — choosing the wrong one for your site conditions is the most common base-layer planning error.
#57 Stone (Open-Graded)
- Angular, fractured aggregate — typically 3/4" nominal size
- Open structure: water drains freely through the base
- Weight: approximately 2,410 lb per cu yd (1.21 tons/cu yd)
- Cambridge Pavingstones specifies 3/4" clean gravel (#57-style) for their 6-inch base
- Use when: well-drained site, drainage is the primary concern
Crusher Run / ¾"-Minus (Dense-Graded)
- Crushed stone with fines (dust) — graded from 3/4" down to dust particles
- Fines fill voids: packs tightly, minimal lateral movement
- Weight: approximately 2,700–2,800 lb per cu yd (1.5 tons/cu yd)
- Belgard install guide specifies crusher run for all residential base installations
- Use when: heavy load, clay subgrade, or high-traffic driveway applications
Never use rounded pea gravel or river stone — these cannot achieve stable compaction. Only angular, fractured aggregate locks together under load.
Compaction Lift Depth — 2 to 3 Inches Maximum Per Pass
Compact in 2 to 3 inch lifts with a vibratory plate compactor (5,000 lb force minimum per Belgard). Plate compactors densify only the top 3 to 4 inches of loose material — deeper lifts leave the lower portion under-compacted. For a 6-inch driveway base: three 2-inch lifts, each compacted separately before adding the next.
Brand Installation Guide Comparison: Belgard, Cambridge & ICPI Baseline
Belgard and Cambridge specify different aggregate types — reflecting the #57 stone vs crusher run trade-off. The ICPI Tech Spec 2 baseline applies when no manufacturer guide is available.
| Attribute | Belgard | Cambridge Pavingstones | ICPI Tech Spec 2 Baseline |
|---|---|---|---|
| Base aggregate type | Crusher run (3/4" down to dust) | 3/4" clean gravel (#57-style) | Dense-graded aggregate |
| Patio / walkway depth | 4–6 inches | 6 inches | 4 inches minimum |
| Residential driveway depth | 6–8 inches | 6+ inches | 6 inches minimum |
| Compaction lift maximum | 4–6 inches per lift | Per ICPI | 2–3 inches per lift |
| Sand spec (bedding layer) | 1 inch C-33 coarse sand | 1 inch C-33 coarse sand | 1 inch ASTM C33 (per CMHA PAV-TEC-002) |
| Compaction force required | 5,000 lb minimum | Plate compactor | Plate compactor |
Paver Base vs Concrete Slab Base vs No Base
| Approach | Drainage | Repair Ease | Material Cost |
|---|---|---|---|
| Aggregate base (ICPI standard) | Excellent | Easy — remove, re-level, replace | $24–$40/ton (verify locally) |
| Existing concrete slab base | Depends on slab slope | Moderate | Sand only (~$15–$25/ton) |
| Compacted soil only | Poor — settlement risk | Difficult | Minimal |
| Sand-set only (no aggregate) | Very poor | Easy short-term; fails long-term | Low initially, high over time |
Paver Base Material Cost Estimate
For a 200 sq ft patio with a 4-inch base, aggregate material cost runs approximately $140–$225 total (bulk + delivery), depending on aggregate type and local delivery rates. Verify pricing with your local landscape supplier before ordering — prices as of May 2026 and vary by region.
| Material | Bulk price (per ton) | 200 sqft / 4" base | Bagged equivalent |
|---|---|---|---|
| #57 stone (open-graded) | $30–$40/ton bulk | ~3.5 tons → $105–$140 | $320–$600/ton equivalent |
| Crusher run / ¾"-minus | $24–$34/ton bulk | ~4.3 tons → $103–$146 | $320–$600/ton equivalent |
| ASTM C33 bedding sand | $15–$25/ton bulk | ~0.85 tons → $13–$21 | $5–$8/50 lb bag |
| Delivery (standard dump) | $10–$25/ton OR free ≥5-ton min | $37–$92 typical | N/A (carry-out) |
Big-box bagged aggregate is 20 to 40 times more expensive per ton than bulk delivery — viable only for projects under 1 ton. For 200 sq ft and larger, bulk delivery from a landscape supply yard is the practical choice. To get pricing, call 3 local suppliers and ask for the price per ton of crusher run or #57 stone delivered; $24–$34/ton for crusher run is a common 2026 baseline. Sources: HomeGuide 2026, Angi 2026, Bovees 2026.
Cold-Climate Frost-Line Override — ICPI Zone Variance
ICPI Tech Spec 2 (February 2020 edition) specifies a cold-climate base adjustment, not the frost-line depth as the base thickness. The frost-line depth is a design input that informs whether additional aggregate is needed — it does not become the aggregate base depth. Requirements vary by climate zone.
ICPI Cold-Climate Base Override by USDA Zone
| USDA Zone | Example Cities | Frost Line Depth | ICPI Base Add |
|---|---|---|---|
| Zones 5–7 (mild) | Atlanta, Dallas, Los Angeles | Below 24 inches | +0 inches |
| Zone 4 (mid-latitude) | Chicago, Denver, Kansas City | 24–36 inches | +2 to +4 inches |
| Zone 3 (northern tier) | Minneapolis, Bangor ME | 42–60 inches | +4 inches (full override) |
Jurisdiction note: The cold-climate override adds 2 to 4 inches of aggregate — NOT the full frost-line depth. ICPI Tech Spec 2 (February 2020 edition) governs residential residential interlocking pavement; commercial paving (Tech Spec 4) requires licensed engineering. Confirm local amendments with your building authority.
Paver Base Installation Checklist
Follow these 6 steps for a structurally sound paver base. Skipping geotextile, deep lifts, or inadequate drainage slope are the three most common failures.
- Mark and measure, then excavate to total depth — total stack = base depth + 1 inch sand + paver thickness (2.25–3.5 inches). For a 4-inch base: excavate approximately 7.75 inches. Remove all organic topsoil before adding aggregate; organic material compresses under load and creates long-term settlement. Source: OSU Extension; Unilock (unilock.com).
- Compact the exposed subgrade before adding any aggregate. This is the step most DIYers skip — soft subgrade defeats all the compaction work done on the aggregate layer above it.
- Install woven geotextile fabric on clay or weak subgrade — above subgrade, below aggregate. Overlap seams 12 inches. Prevents fine-particle migration (pumping) that destroys drainage capacity within 2 to 3 seasons. Source: Unilock installation guide.
- Add aggregate in 2 to 3 inch lifts; compact each lift separately — do not dump the full depth at once. For a 6-inch driveway base: three 2-inch lifts, each compacted (5,000 lb plate compactor minimum per Belgard) before adding the next. Source: Belgard Product Installation Guide (May 2025).
- Set drainage slope during base installation — target ¼ inch drop per foot away from structure. Use a 4-foot level: place on aggregate surface, the downslope end should show a ¼-inch gap. Correct at the aggregate layer, not at the sand layer. Source: ICPI default slope requirement.
- Screed 1 inch of ASTM C33 coarse concrete sand per CMHA PAV-TEC-002 (legacy ICPI Tech Spec 2), place pavers, then run a final compaction pass with a rubber pad on the compactor plate to seat pavers into the sand. Re-check slope after the first rain; puddles persisting 4 or more hours indicate a correction is needed. Source: CMHA PAV-TEC-002; Belgard install guide.
Common Paver Base Mistakes
Skipping geotextile fabric on clay soils
Without geotextile fabric between the subgrade and aggregate base on clay or weak soils, fine particles migrate upward into the aggregate over 2 to 3 seasons — a process called pumping. This destroys base drainage capacity and causes uneven paver settlement. Always use woven geotextile on clay subgrade; seam overlap 12 inches. Source: Unilock installation guide + mylandscapecontractor.com.
Compacting too deep per lift (dumping 6-8 inches at once)
Plate compactors effectively densify only the top 3 to 4 inches of loose material. Dumping 6 to 8 inches and running a single pass leaves the lower portion under-compacted — a soft zone that settles under load within one or two seasons. Always add aggregate in 2 to 3 inch lifts and compact each lift before adding the next. Source: Unilock Do's and Don'ts; ntpavers.com "11 Common Paver Installation Mistakes."
Using rounded pea gravel or river stone for the base
Rounded stones act like ball bearings under load and cannot interlock under compaction — the base remains loose and mobile regardless of how much compaction force is applied. Only angular, fractured aggregate (crusher run, #57 stone, quarry process) locks together when compacted. Source: ntpavers.com; NY Pavers (nypavers.com).
Setting drainage slope visually rather than measuring
Pavers that slope toward a structure trap water at the foundation. The ICPI minimum is ¼ inch per foot away from the structure — a slope that is nearly invisible to the eye but measurable with a 4-foot level and tape measure. Surfaces that look flat typically have zero or negative slope. Measure every 4 feet during base installation; correct in the aggregate layer, not at the sand layer. Source: ICPI default; multiple contractor guides.
Frequently Asked Questions
How deep should the gravel base be for pavers?
Per ICPI Tech Spec 2 (February 2020 edition), the minimum base depth is 4 inches for pedestrian surfaces (patios, sidewalks) on well-drained soil, and 6 inches for residential driveways on well-drained soil. Cold-climate areas with freeze-thaw cycles require an additional 2 to 4 inches. Add 1 inch for ASTM C33 bedding sand on top of the aggregate.
How many tons of gravel do I need for a paver base?
For #57 stone at 1.21 tons per cubic yard: area (sq ft) × (depth in inches ÷ 12) ÷ 27 × 1.21 = tons. Example: 200 sq ft × 4-inch base = 2.47 cu yd × 1.21 = approximately 3.0 tons. For crusher run at 1.5 tons per cu yd, multiply by 1.5 instead (~3.7 tons for the same area). Add 10–15% for compaction overage.
What type of gravel is best for a paver base?
Two aggregate types are standard: #57 stone (~2,410 lb per cu yd, open-graded, excellent drainage) and ¾"-minus crusher run (~2,700–2,800 lb per cu yd, dense-graded, tighter compaction). Belgard specifies crusher run; Cambridge specifies #57-style clean gravel. Never use rounded pea gravel — these cannot interlock under compaction.
How do I compact gravel for pavers?
Compact in 2 to 3 inch lifts using a vibratory plate compactor (5,000 lb force minimum). Do not dump 6 to 8 inches and run a single pass — the lower portion stays under-compacted. Do not compact the 1-inch ASTM C33 sand bedding layer (per CMHA PAV-TEC-002) before placing pavers.
Estimate your Paver Base, Count & Full Material Bundle
This guide covers base depth, tons of gravel, aggregate selection, compaction lift depth, and cold-climate adjustments. For a complete estimate — 4.5 pavers per sq ft × your sq ft × paver weight, plus base tonnage, sand, geotextile, and edge restraint — use the full Paver Calculator with your project dimensions.
Open the Paver Calculator →Related Paver Calculators
- Patio Stone Calculator — large-format stone coverage (Mega-Arbel ~40 lb each), 6–8" base for heavy stone, sq ft to pieces
- Paver Walkway Calculator — linear walkway dimensions, curved vs straight cut waste (5–15%), dual drainage slope for walkways
- Paver Weight Calculator — standard 4×8" 60mm pavers weigh 4–6 lb each; 480–540 per pallet; truck payload planning