Pea Gravel Calculator
Estimate cubic feet, cubic yards, tons, bags & cost — free and instant
Enter your measurements
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Free Pea Gravel Calculator
Most people order too much or too little pea gravel because they guess the depth. A small mistake in inches can change the total by several bags or even a full cubic yard. Use this Pea Gravel Calculator to estimate how much material you need for a patio, walkway, driveway, playground, dog run, or landscape bed.
You can use this tool as a pea gravel amount calculator, coverage calculator, cost calculator, weight calculator, tons tool, yards tool, or bags tool. Enter the length, width, and depth to calculate pea gravel in cubic feet, cubic yards, tons, bags, and estimated cost.
- Cubic Feet
- Cubic Yards
- Estimated Tons & Pounds
- Number of Bags
- Estimated Cost
- 10% Extra Allowance
How the Pea Gravel Calculator Works
The calculator multiplies length, width, and depth to find volume, then converts that volume into cubic yards, tons, bags, and cost
Calculation Steps
- Measure length in feet (or select your unit above).
- Measure width in feet.
- Enter depth in inches — the calculator converts it to feet automatically.
- Multiply length × width × depth to get cubic feet.
- Divide by 27 to convert cubic feet to cubic yards.
- Multiply cubic yards by 1.3 to estimate tons (pea gravel density varies 1.2–1.4 tons/yd³).
- Divide cubic feet by bag size (usually 0.5 cu ft) to estimate bag count.
This gives you a practical estimate before you order. For the best accuracy, confirm material density and pricing with your local supplier.
Recommended Pea Gravel Depth by Project Type
The right depth depends on how the area will be used — decorative areas need less, driveways and playgrounds need more
| Project | Recommended Depth | Notes |
|---|---|---|
| Landscape bed | 1–2 inches | Best for light decorative cover |
| Garden path | 2–3 inches | Use edging to hold gravel in place |
| Patio area | 2–3 inches | Works best with a firm compacted base |
| Dog run | 3–4 inches | Helps with drainage |
| Playground surface | 4–6 inches | Check local safety requirements |
| Driveway | 4–6 inches | Needs a stable base layer underneath |
Patio & Walkway
Use landscape fabric, edging, and a compacted base. Pea gravel can shift if the border is weak. Add edging along both sides of walkways to prevent spreading into grass or soil.
Pea Gravel Driveway
A pea gravel driveway needs a stable compacted base underneath the top layer. Pea gravel can shift under tires and may need more maintenance than crushed stone.
Playground
Check local rules before using pea gravel under play equipment. Safety needs can change by fall height, border design, and site conditions.
Pea Gravel Coverage Chart
Coverage depends on depth — one cubic yard covers more area at 1 inch than at 4 inches
| Depth | Coverage per 1 Cubic Yard | Coverage per 1 Cubic Foot |
|---|---|---|
| 1 inch | 324 sq ft | 12 sq ft |
| 2 inches | 162 sq ft | 6 sq ft |
| 3 inches | 108 sq ft | 4 sq ft |
| 4 inches | 81 sq ft | 3 sq ft |
| 6 inches | 54 sq ft | 2 sq ft |
To calculate coverage for any area, multiply the area by the depth in feet. For example: 100 sq ft × 0.25 ft (3 in) = 25 cubic feet. Depth changes the order amount fast — a 200 sq ft area at 4 inches needs double the gravel of the same area at 2 inches.
Pea Gravel Formula
Use these formulas to calculate pea gravel by hand for patios, paths, driveways, playgrounds, and landscape beds
A patio is 12 ft long and 10 ft wide. You want 3 inches of pea gravel.
Add 5–10% extra for settling, spreading, and uneven areas before ordering.
Depth Conversion: Inches to Feet
| Depth (Inches) | Depth (Feet) |
|---|---|
| 1 inch | 0.083 ft |
| 2 inches | 0.167 ft |
| 3 inches | 0.25 ft |
| 4 inches | 0.333 ft |
| 6 inches | 0.5 ft |
Pea Gravel Bag Calculator
Estimates how many bags you need for small projects — borders, planters, short paths, and repairs
Most bagged pea gravel products list volume in cubic feet. Many common bags hold about 0.5 cubic feet, though the exact size can vary. Use the volume printed on the bag — it is more accurate than weight alone for coverage estimates.
| Option | Best For | Main Benefit | Main Limit |
|---|---|---|---|
| Bags | Small areas | Easy to carry, no delivery needed | Higher cost per volume |
| Bulk yards | Medium projects | Good for patios and paths | Needs delivery or hauling |
| Bulk tons | Large jobs | Common supplier unit | Weight varies by material |
30 ÷ 0.5 (bag size) = 60 half-cubic-foot bags before extra allowance.
This does not include delivery, taxes, site prep, edging, fabric, or labor.
Pea Gravel Cost Calculator
Estimates project cost from material amount and price per ton, cubic yard, or bag
Example: 2 tons × $45 = $90
Example: 3 yd³ × $55 = $165
Example: 40 bags × $6 = $240
Cost depends on your location, supplier, delivery distance, gravel color, and order size. Bagged gravel often costs more per cubic foot than bulk gravel. Check current local pricing before ordering — prices can change by ZIP code and delivery distance.
Common Mistakes When Calculating Pea Gravel
Most pea gravel mistakes come from wrong depth, poor unit conversion, or no extra material allowance
Using the Wrong Depth
- Do not use the same depth for every project.
- A landscape border does not need the same depth as a driveway.
- Choose depth based on use, traffic, base condition, and drainage needs.
Forgetting to Convert Inches to Feet
- Depth must be in feet before using the formula.
- If you use 3 instead of 0.25 feet, the result will be 12× too high.
- Divide inches by 12 to convert (e.g., 3 in ÷ 12 = 0.25 ft).
Not Adding Extra for Settling
- Pea gravel settles after spreading, walking, and weather changes.
- Many projects benefit from a 5% to 10% extra allowance.
- Add more if the ground is uneven or the shape is hard to measure.
Ignoring Edging and Shape Changes
- Rounded pea gravel spreads without edging.
- Weak borders make the area look thinner over time.
- For curved areas, measure carefully — small shape changes add more area than expected.
Ready to Estimate Your Pea Gravel?
Use the free calculator above to get instant results in cubic feet, cubic yards, tons, bags, and cost — no sign-up required.
Calculate NowPea Gravel Calculator FAQs
Common questions about pea gravel calculations, depth, bags, and cost
Measure length, width, and depth. Multiply them to get cubic feet, then divide by 27 for cubic yards. Use the calculator to convert yards into tons, bags, and cost.
Use this formula: length × width × depth. Keep length and width in feet. Convert depth from inches to feet before multiplying. Example: 12 ft × 10 ft × 0.25 ft = 30 cubic feet.
Multiply cubic yards by the tons-per-yard estimate. Many pea gravel estimates use about 1.2 to 1.4 tons per cubic yard, but supplier density can vary. Our calculator uses 1.3 tons per cubic yard as a standard estimate.
Multiply length by width by depth (in feet) to get cubic feet. Then divide cubic feet by 27 to get cubic yards. For a 12 × 10 ft patio at 3 inches deep: 30 ÷ 27 = 1.11 cubic yards.
Divide total cubic feet by the bag volume. If one bag holds 0.5 cubic feet and your project needs 20 cubic feet, you need about 40 bags. Use the volume printed on the bag — not the weight — for best accuracy.
One cubic yard covers about 162 square feet at 2 inches deep. It covers about 108 square feet at 3 inches deep. At 1 inch deep, one cubic yard covers about 324 square feet.
Use 1–2 inches for landscape beds, 2–3 inches for patios and paths, and 4–6 inches for heavier-use areas like driveways and playgrounds. Always match depth to how the area will be used.
Yes, but it needs a stable base and good edging. Pea gravel can shift under tires and may need more maintenance than crushed stone. Use a compacted base layer under the top layer for best results.
Bulk pea gravel is often cheaper for larger jobs. Bags are better for small areas, repairs, and projects where delivery is not practical. For large projects, compare bulk and bag pricing before ordering.
Yes, add about 5% to 10% extra for spreading, settling, and uneven areas. Add more for curved shapes or rough ground. Our calculator already includes a 10% extra allowance in the results.
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Use CalculatorStart Your Pea Gravel Estimate
Enter your area size and depth to get instant results in cubic feet, cubic yards, tons, bags, and cost — no account needed.