Gravel Calculator

Gravel is evaluated from Length, Width and Depth. The calculation reports Cubic Feet, Cubic Yards and Tons Needed.

Results

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About the Gravel Calculator

Gravel is treated here as a quantitative relation between Length, Width, Depth and Gravel Type and Cubic Feet, Cubic Yards, Tons Needed and 50-lb Bags.

The calculator uses a multi formula configuration. Each reported value is read as a direct evaluation of the stored rules with the declared field formats and units.

Formula basis:
Cubic feet = length x width x (depth / 12)
Cubic yards = cubic feet / 27
Tons = cubic yards x density (tons per cubic yard)
50-lb bags = tons x 2,000 / 50 (rounded up)
For driveways and high-compaction areas: add 10 - 15% for compaction settling.

Interpret the outputs in the order shown by the result fields. Optional inputs affect only the outputs that depend on those variables.

Formula & How It Works

The calculation applies the following relations exactly as recorded in the metadata:

Cubic feet = length x width x (depth / 12)
Cubic yards = cubic feet / 27
Tons = cubic yards x density (tons per cubic yard)
50-lb bags = tons x 2,000 / 50 (rounded up)
For driveways and high-compaction areas: add 10 - 15% for compaction settling.

Each output field is produced by substituting the supplied inputs into the relevant relation and then applying the declared rounding or text format.

Worked Examples

Example 1: Garden path: 30 ft × 3 ft, 2 inches of pea gravel

Inputs

length: 30 width: 3 depth: 2 gravel_type: Pea gravel / decorative (1.35 tons/yd³)
Cubic Feet: 15 ft^3. Cubic Yards: 0.56 yd^3. Tons Needed: 0.75 tons. 50-lb Bags: 31 bags

With Length = 30, Width = 3, Depth = 2 and Gravel Type = Pea gravel / decorative (1.35 tons/yd^3) as the stated inputs, the result is Cubic Feet = 15 ft^3, Cubic Yards = 0.56 yd^3 and Tons Needed = 0.75 tons. Each value corresponds to the declared output fields.

Example 2: Driveway extension: 20 ft × 12 ft, 4 inches crushed stone

Inputs

length: 20 width: 12 depth: 4 gravel_type: Crushed stone #57 (1.4 tons/yd³)
Cubic Feet: 80 ft^3. Cubic Yards: 2.96 yd^3. Tons Needed: 4.15 tons. 50-lb Bags: 166 bags

With Length = 20, Width = 12, Depth = 4 and Gravel Type = Crushed stone #57 (1.4 tons/yd^3) as the stated inputs, the result is Cubic Feet = 80 ft^3, Cubic Yards = 2.96 yd^3 and Tons Needed = 4.15 tons. Each value corresponds to the declared output fields.

Example 3: Backyard patio: 15 ft × 15 ft, 3 inches of river rock

Inputs

length: 15 width: 15 depth: 3 gravel_type: River rock / large (1.35 tons/yd³)
Cubic Feet: 56.3 ft^3. Cubic Yards: 2.08 yd^3. Tons Needed: 2.81 tons. 50-lb Bags: 113 bags

With Length = 15, Width = 15, Depth = 3 and Gravel Type = River rock / large (1.35 tons/yd^3) as the stated inputs, the result is Cubic Feet = 56.3 ft^3, Cubic Yards = 2.08 yd^3 and Tons Needed = 2.81 tons. Each value corresponds to the declared output fields.

Example 4: French drain backfill: 50 ft × 1.5 ft × 12 inches deep

Inputs

length: 50 width: 1.5 depth: 12 gravel_type: Crushed stone #57 (1.4 tons/yd³)
Cubic Feet: 75 ft^3. Cubic Yards: 2.78 yd^3. Tons Needed: 3.89 tons. 50-lb Bags: 156 bags

With Length = 50, Width = 1.5, Depth = 12 and Gravel Type = Crushed stone #57 (1.4 tons/yd^3) as the stated inputs, the result is Cubic Feet = 75 ft^3, Cubic Yards = 2.78 yd^3 and Tons Needed = 3.89 tons. Each value corresponds to the declared output fields.

Common Use Cases

  • Calculate gravel for a new driveway
  • Estimate decorative gravel for garden paths
  • Determine pea gravel for a patio or play area