Math & Everyday
Gravel Calculator
Tons and cubic yards of gravel needed, by material type and depth.
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CalcoTools · Gravel Calculator · generated 9/1/2026, 1:32:19 PM
About the Gravel Calculator
Calculates tons and cubic yards of gravel needed for a driveway, path, or base layer, from area and depth, using real published bulk-density figures for 4 common gravel types.
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How to use it
- Enter the area's length and width.
- Enter the desired depth.
- Choose a gravel type — density varies by type.
- Read the tons and cubic yards needed.
Formula
Volume (cubic ft) = area × depth (inches ÷ 12). Cubic yards = volume ÷ 27. Weight (lb) = cubic yards × that gravel type's density. Tons = weight ÷ 2,000.
Worked example
A 20ft × 10ft area at 4 inches deep, general gravel: 2.47 cubic yards, about 7,161 lb, or 3.58 tons.
Typical gravel bulk density by type
| Type | lb per cubic yard |
|---|---|
| River rock | ~2,500 |
| Pea gravel | ~2,600 |
| General gravel | ~2,900 |
| Crushed stone / limestone | ~3,000 |
Interpreting your result
Density varies by gravel type: general gravel ~2,900 lb/cubic yard, pea gravel ~2,600, crushed stone/limestone ~3,000, river rock ~2,500. These are published averages — ask your supplier for their material's exact density. This tool doesn't account for compaction (typically 10-20%).
Recommendations
- • Order slightly more than the exact calculated amount for a driveway or path base you plan to compact.
- • Angular crushed stone locks together better for a stable base layer; rounder pea gravel or river rock is often chosen for looks or drainage.
- • Ask your specific supplier for their material's density — published averages can be off for an unusual blend.
Frequently asked questions
Bulk density depends on stone shape and size — angular pieces pack tightly, rounder stones leave more air gaps.
Related searches
Sources
- Gravel Calculation — Gravel Weight Chart — accessed 2026-08-30