Pea Gravel Calculator to estimate gravel volume, tons, bags, and cost. Formula: volume = area × depth, then convert cubic feet to cubic yards or tons.
This pea gravel calculator tells you estimates how much material you need — in cubic yards, tons, cubic feet, and bags — along with an estimated material cost. Enter your area dimensions, gravel depth, density, and price, and the gravel calculator returns every number you need to order with confidence. Waste factor is built in so you never come up short.
What This Pea Gravel Calculator Does
The calculator estimates pea gravel volume, weight, bag counts, and total material cost from your project area and desired depth. It supports three input modes: Rectangle / Square, Circle / Round Area, and I Know My Area for when you already have a square-footage figure.
Switch the density preset and price basis and it doubles as a general gravel calculator in tons, a gravel calculator in yards, or a pea gravel calculator — without losing its pea-gravel-first defaults.
How to Use the Pea Gravel Calculator
- Choose the project shape — Rectangle / Square, Circle / Round Area, or I Know My Area.
- Enter your dimensions — length and width for rectangles, diameter for circles, or a total area figure if you already have it.
- Enter gravel depth — the target thickness of your pea gravel layer.
- Confirm the density — Pea Gravel (105 lb/ft³) is the default. Switch to Crushed Stone, Dry Sand, Aquarium Gravel, or enter a custom density if your supplier provides one.
- Set a waste factor — 5% is a sensible default for most projects. Adjust up for irregular shapes or difficult ground.
- Enter your material price — per cubic yard or per ton, and select your currency.
- Read the results — cubic yards, tons, bag counts, truck fraction, wheelbarrow loads, and estimated material cost appear instantly.
Pea Gravel Formula
The calculator chains a short sequence of unit-conversion formulas. Here is the full path from raw measurements to the final cost estimate.
Step 1 — Project Area
For a rectangle or square:
$$\text{Area} = \text{Length} \times \text{Width}$$
For a circle, using radius $r = \text{Diameter} \div 2$:
$$\text{Area} = \pi \times r^2$$
Step 2 — Raw Volume
$$\text{Volume (cu ft)} = \text{Area (sq ft)} \times \text{Depth (ft)}$$
Depth must be in feet. Convert inches by dividing by 12 — for example, 3 inches = $3 \div 12 = 0.25\ \text{ft}$.
Step 3 — Waste Adjustment
$$\text{Final Volume} = \text{Volume} \times \left(1 + \frac{\text{Waste \%}}{100}\right)$$
Step 4 — Cubic Yards
$$\text{Cubic Yards} = \frac{\text{Cubic Feet}}{27}$$
Step 5 — Weight
$$\text{Pounds} = \text{Cubic Feet} \times \text{Density (lb/ft}^3\text{)}$$
$$\text{US Tons} = \frac{\text{Pounds}}{2000}$$
Step 6 — Cost
If pricing by ton:
$$\text{Cost} = \text{Tons} \times \text{Price per Ton}$$
If pricing by cubic yard:
$$\text{Cost} = \text{Cubic Yards} \times \text{Price per Cubic Yard}$$
Pea Gravel Calculator Example
Project: a rectangular pathway, 20 ft long by 10 ft wide, 3 in deep. Pea gravel density: $105\ \text{lb/ft}^3$. Waste factor: 5%. Material price: $45 per ton.
Pea Gravel in Cubic Yards vs Tons
Cubic yards measure volume — the physical space the gravel occupies. Tons measure weight. Many suppliers quote both, and the gravel calculator in yards or the gravel calculator in tons shows whichever number you need to match your supplier’s invoice.
The link between them is density. Pea gravel weighs roughly $105\ \text{lb/ft}^3$, so one cubic yard ($27\ \text{ft}^3$) weighs approximately:
$$27 \times 105 = 2{,}835\ \text{lb} \approx 1.42\ \text{US tons}$$
A supplier selling by volume uses the gravel calculator yards number; one selling by weight uses the gravel calculator tons figure. Both come from the same formula — only the final unit differs.
How Much Pea Gravel Do You Need by Project Type?
The right depth varies by project. The table below shows typical depth ranges for common uses. These are general starting points — always follow your project specifications or supplier recommendations.
| Project Type | Typical Depth | Notes |
|---|---|---|
| Pathway / Walkway | 2–3 in | Stable underfoot; compact base recommended beneath |
| Patio surface | 2–3 in | Keep depth consistent for even footing |
| Driveway top layer | 4–6 in | Use bulk delivery; check the truck fraction output |
| Paver base / top layer | Varies | Depends on base design; check paver installation specs |
| French drain trench | Varies | Depends on trench width, pipe diameter, and drain design |
| Aquarium gravel | Shallow | Use aquarium-safe gravel; switch density preset in calculator |
Pea Gravel Bags, Bulk Delivery, and Wheelbarrow Loads
The calculator converts your final volume and weight into four practical purchasing and handling figures:
- 50 lb bags — total estimated pounds ÷ 50. Useful for small projects where bagged gravel from a home center is more practical than a bulk delivery.
- 0.5 cu ft bags — total cubic feet ÷ 0.5. Matches the volume-labeled bags stocked at many retail stores.
- Wheelbarrow loads — total cubic feet ÷ 3 cu ft per standard contractor wheelbarrow. Helps you plan how many trips to budget during spreading.
- Truck fraction — your cubic yards as a fraction of a 10-yard delivery truck. If the number exceeds 1.0, you may need more than one truck load.
For the 20 × 10 ft pathway example, the outputs are 111 bags (50 lb), 105 bags (0.5 cu ft), and roughly 18 wheelbarrow loads from 52.50 cu ft.
Cost Estimate for Pea Gravel
Enter your supplier’s price either per ton or per cubic yard — the calculator applies the correct formula automatically and outputs estimated material cost and cost per square foot.
For bulk driveway projects, a driveway gravel calculator mode is common because suppliers price large orders by the ton. For smaller patios and paths, per-cubic-yard pricing from a local landscape yard is typical.
What this estimate does not include: delivery fees, geotextile fabric, edging or borders, compaction, labor, taxes, or any base-layer material. Treat the output as a material-only budget line.
When to Add a Waste Factor
No gravel installation is perfectly efficient. The waste factor covers:
- Spreading and handling loss during installation
- Settling after the first rainfall or compaction pass
- Edge losses on irregular or curved boundaries
- Uneven sub-grade that consumes more material in low spots
- Buffer against supplier short-weight or measurement error
The default is 5%, which suits most straight-edged rectangular projects. Increase it for complex shapes, rough sub-grade, or when re-ordering would be inconvenient. Your project tolerance — not a fixed universal rule — should guide the number you enter.
Pea Gravel vs Other Gravel Materials
The density preset controls which material you are calculating. The built-in options and their approximate default densities are:
| Preset | Approx. Density | Typical Use Case |
|---|---|---|
| Pea Gravel | ~105 lb/ft³ | Paths, patios, drainage, driveways |
| Crushed Stone / Gravel | ~100 lb/ft³ | Road base, drainage sub-layer |
| Sand (Dry) | ~100 lb/ft³ | Paver base, leveling layer |
| Aquarium Gravel | ~95 lb/ft³ | Decorative tank substrate |
| Custom Density | User-entered | Any material; use supplier data sheet |
If your supplier publishes a specific compacted or loose density, enter it as a custom value for the most accurate result.
Frequently Asked Questions
How do I calculate how much pea gravel I need?
Multiply your area in square feet by your desired depth in feet, then add your waste percentage. Divide cubic feet by 27 to get cubic yards. For example, a 200 sq ft area at 3 in deep gives $200 \times 0.25 = 50\ \text{cu ft}$, or roughly 1.85 cu yd before waste. Enter your numbers into the calculator above and it handles every step.
How many cubic yards of pea gravel do I need?
Use the formula $$\text{Cubic Yards} = (\text{Area} \times \text{Depth in ft}) \div 27$$. The calculator displays cubic yards in the first output line, adjusted for any waste factor you set.
How do I convert pea gravel yards to tons?
Multiply cubic yards by 27 to get cubic feet, multiply by density ($105\ \text{lb/ft}^3$ for pea gravel), then divide by 2,000 to reach US tons. The gravel calculator tons output does this automatically — no manual conversion needed.
How many tons of pea gravel are in a cubic yard?
At a typical density of $105\ \text{lb/ft}^3$, one cubic yard of pea gravel weighs approximately 1.42 US tons. Moisture content and grading can shift this slightly — confirm with your supplier for large orders.
How deep should pea gravel be for a walkway?
A depth of 2–3 inches is typical for residential walkways. Shallower layers tend to scatter underfoot; deeper layers add stability but increase material cost. Check your specific path design before ordering.
How much pea gravel do I need for a driveway?
Driveway top layers are typically 4–6 inches deep. Enter your driveway length, width, and depth into the driveway gravel calculator and it outputs cubic yards and tons. Driveways almost always require bulk delivery — check the truck fraction output to confirm load count.
How much pea gravel do I need for pavers?
Pea gravel is sometimes used as a decorative top layer between or around pavers rather than as a structural base. Depth depends on your base design. Enter your paver area and target gravel depth; the paver gravel calculator output gives your volume and bag count.
Can this calculator work for a French drain?
Yes. Enter your trench length and width as rectangle dimensions, with the gravel fill depth as your depth input. For most residential drains the pipe size/design can affect exact volume. The french drain gravel calculator output gives a close estimate to start from.
Can I use this as an aquarium gravel calculator?
Yes. Switch the density preset to Aquarium Gravel, enter your tank footprint as the area, and set your desired substrate depth. Use only aquarium-safe gravel — confirm the material is rated for fish tanks before purchasing.
Is pea gravel ordered by tons or cubic yards?
Both are common. Landscape yards often sell by the cubic yard; quarries and bulk suppliers frequently price by the ton. The calculator outputs both figures — enter your supplier’s unit in the price field and read the matching cost line.
References
- NIST Handbook 44, Appendix C — General Tables of Units of Measurement. Used for standard unit-conversion basis, including cubic feet, cubic yards, pounds, tons, and rounding considerations.
- NIST SP 811 — Guide for the Use of the International System of Units (SI). Used for metric-unit handling and SI conversion context, including cubic meters and metric mass units.
- USGS Mineral Commodity Summaries 2026 — Sand and Gravel (Construction). Supports the construction-use context for sand and gravel aggregates, including road base, construction fill, drainage, and related aggregate applications.
- USGS Mineral Commodity Summaries 2026 — Crushed Stone. Supports the broader aggregate-material context for crushed stone and gravel used in construction and road applications.
- ASTM C33/C33M — Standard Specification for Concrete Aggregates. Referenced for aggregate grading and quality context where gravel or crushed stone is used as a construction aggregate.
- Royal Horticultural Society — Gravel Gardens. Used as a practical reference for garden gravel coverage and depth context.