🪨 Pea Gravel Calculator 2026 - Free Coverage & Cost Estimator

To calculate pea gravel needed: (1) Measure area length and width in feet, (2) Multiply length × width = square feet, (3) Choose depth in inches (2-3 inches for pathways, 3-4 inches for driveways), (4) Convert depth to feet by dividing by 12, (5) Multiply square feet × depth in feet = cubic feet, (6) Divide by 27 to get cubic yards. Example: 20 ft × 10 ft × 3 inches deep = 200 sq ft × 0.25 ft = 50 cubic feet = 1.85 cubic yards. One cubic yard covers 108 sq ft at 3 inches deep. Add 5-10% for compaction and spillage. Pea gravel weighs approximately 2,800 lbs per cubic yard (1.4 tons).

Recommended pea gravel depths vary by application: Pathways and walkways: 2-3 inches (foot traffic only, decorative), Driveways and parking: 3-4 inches minimum (vehicle traffic, needs compacted base), Patios and seating areas: 2-3 inches (level surface, comfortable walking), Landscaping and garden beds: 1-2 inches (decorative, weed suppression), Drainage and French drains: 3-6 inches (water flow, percolation), Play areas and pet runs: 3-4 inches (cushioning, drainage). Deeper is better for high-traffic areas - 4 inches prevents gravel from shifting and exposing ground. Always install landscape fabric underneath to prevent gravel mixing with soil and reduce weed growth. Compact base layer before adding pea gravel for stability.

In 2026, pea gravel costs vary by quantity and delivery: Bulk delivery (most economical): $35-65 per cubic yard depending on region, quality, and color. 1-2 cubic yards: $55-65/yard (small load fee), 3-5 cubic yards: $45-55/yard, 6-10 cubic yards: $35-45/yard (best value). Bags (convenient for small projects): 0.5 cubic foot bags: $4-7 each (54 bags = 1 cubic yard), 1 cubic foot bags: $6-10 each (27 bags = 1 cubic yard). Delivery fees add $50-150 depending on distance and quantity (free delivery often available for 5+ yards). Regional pricing: Midwest baseline, Northeast +20%, South -10%, West +15%. Premium colors (white, beach pebbles) cost 20-30% more than standard tan/gray. Total installed cost including delivery and spreading: $55-85 per cubic yard.

Pea gravel serves multiple landscaping and construction purposes: Driveways and parking areas (affordable alternative to asphalt/concrete, permeable surface), Pathways and walkways (natural appearance, comfortable to walk on, good drainage), Patios and outdoor living spaces (stable surface, easy maintenance, attractive), Landscaping and decorative ground cover (weed suppression, moisture retention, clean appearance), Drainage solutions and French drains (excellent percolation, doesn't compact, prevents erosion), Around foundations (drainage, termite barrier, prevents splash-back), Garden beds and tree rings (mulch alternative, doesn't decompose, no insects), Play areas and dog runs (soft surface, drains well, stays cooler than pavement), Aquariums and ponds (natural filtration, decorative substrate). Pea gravel is 3/8 inch rounded stones - smooth texture, safe for bare feet, dogs, and children. Doesn't compact like crushed stone, provides excellent drainage.

Bag quantity depends on bag size. Standard 0.5 cubic foot bags: 54 bags = 1 cubic yard (27 cubic feet ÷ 0.5). 1 cubic foot bags: 27 bags = 1 cubic yard. 2 cubic foot bags: 13.5 bags = 1 cubic yard. Example calculation: 3 cubic yards needed × 54 bags (0.5 cu ft) = 162 bags. Cost comparison: Bulk delivery: $45-55 per cubic yard = 3 yards × $50 = $150. Bags: 162 bags × $5 each = $810 (5× more expensive). Bags practical only for very small projects under 1 cubic yard (less than 100 square feet at 3 inches deep). Use bulk delivery for projects over 1 cubic yard - significant savings on material and labor. Bags good for: tight access areas, rooftop gardens, small touch-ups, decorative accents under 50 sq ft.

Pea gravel itself doesn't compact well due to round shape - stones roll and shift rather than lock together. However, base preparation is critical: Compact BASE LAYER first: excavate 6-8 inches, add 3-4 inches crushed stone base (3/4-inch angular), compact with plate compactor or tamper to solid surface. Install landscape fabric over compacted base (prevents gravel mixing with soil, blocks weeds). Add pea gravel on top: spread to desired depth (2-4 inches), rake level, walk surface to settle stones naturally. DO NOT compact pea gravel layer - compaction damages drainage properties and creates uneven surface. For driveways: deeper crushed stone base (6 inches compacted) provides structural support, pea gravel is top decorative/functional layer only. For pathways: adequate base compaction prevents settling and gravel migration. Pea gravel advantage: self-draining surface, doesn't compact over time, maintains permeability for water infiltration.

Pea gravel and crushed stone differ in shape, size, and applications. Pea gravel (rounded stones): 3/8 inch smooth rounded pebbles, naturally tumbled or river rock, doesn't compact or lock together, excellent drainage (water flows through easily), comfortable to walk on barefoot, safe for dogs and children, decorative appearance, used for pathways, landscaping, drainage, top surface layer. Crushed stone (angular): various sizes (3/4-inch, 1.5-inch common), mechanically crushed with sharp edges, compacts and locks together firmly, good base material (limited drainage when compacted), uncomfortable for walking/bare feet, utilitarian appearance, used for driveways, road base, foundations, structural support. Best practice: use both together - crushed stone compacted base (structural support) + pea gravel top layer (aesthetics, drainage, comfort). Never use only pea gravel for driveways without proper base - vehicles will create ruts and displace gravel. Choose pea gravel when: appearance matters, drainage important, foot traffic, decorative. Choose crushed stone when: structural support needed, heavy loads, base layers, compaction required.

Calculate different shapes using specific formulas. Circular areas (patios, fire pits, tree rings): Formula: π × radius² = square feet. Radius = diameter ÷ 2. Example: 10 ft diameter = 5 ft radius. 3.14159 × 5² = 78.5 sq ft. Convert to cubic yards: 78.5 sq ft × 0.25 ft depth (3 inches) ÷ 27 = 0.73 cubic yards. Oval areas: Formula: π × length × width ÷ 4. Example: 12 ft × 8 ft oval = 3.14159 × 12 × 8 ÷ 4 = 75.4 sq ft. Irregular shapes: divide into rectangles and triangles, calculate each section separately, add together. Triangle: base × height ÷ 2. Or measure irregular area at multiple points, calculate average dimensions. Free tool tip: measure irregular areas with Google Earth or mapping apps - trace perimeter, get square footage automatically. Always add 10-15% extra for irregular shapes - harder to estimate accurately, more waste from spreading and contouring.