SolverOrg

Material takeoff

Measure the project, then plan what to order.

Calculate gravel or crushed-stone volume, apply your allowance, enter the density from your supplier, and make the purchasing unit and rounding explicit.

Measurements

Project areas

Add a second rectangle for a separate zone. Project geometry comes from the shared SolverOrg volume engine.

Primary area
Material depth
Preset
Second area
Extra material allowance

Applied after geometric volume and shown separately.

Material density
kg/m³

Required user-configured assumption. Use the density for the selected material from your supplier or project documentation.

Purchasing method
yd³

Leave the increment blank if your supplier has not specified one. Rounding only affects the purchasing quantity.

Optional cost
USD

Leave blank for quantity-only planning. If entered, cost uses the selected purchasing quantity.

Starting estimate is ready.

Project takeoff

Engine result

Purchasing quantity

3.5 yd³

Round up to the selected 0.5 yd³ purchasing increment.

Based on 20 ft × 12 ft at a 4 in material depth.

Geometric base volume
2.96 yd³
Extra material allowance
+0.3 yd³ (10%)
Final calculated requirement
3.26 yd³
Estimated mass
4.39 US tons
Purchasing quantity
3.5 yd³

Show your work

  1. Normalize area 1 dimensions, then calculate its rectangular-prism volume.

    6.096 m × 3.6576000000000004 m × 0.1016 m = 2.26534772736 m³= 2.27 m³

  2. Sum normalized area volumes before applying any adjustment.

    2.26534772736 = 2.26534772736 m³= 2.27 m³

  3. Apply the user-configured waste or adjustment factor after base geometry.

    2.26534772736 m³ × (1 + 10 ÷ 100) = 2.491882500096 m³= 2.49 m³

  4. Multiply final calculated volume by the user-configured material density.

    2.491882500096 m³ × 1600 kg/m³ = 3987.0120001536 kg= 3,987.01 kg

  5. Round only the purchasing quantity upward; calculated volume and estimated mass remain unchanged.

    round up 3.259259259259259 yd³ to 0.5 yd³ increments = 3.5 yd³= 3.5 yd³

Assumptions & warnings

  • Extra material allowance: 10%
  • Material density: 1,600 kg/m³ (user-configured)
  • warning: Actual weight can vary with moisture, gradation, compaction, material type, and supplier specification. Confirm the density and ordering basis with your supplier.
  • info: The purchasing quantity was rounded upward and is greater than the calculated requirement.
Technical details, sources & version
  • SI and customary length, volume, and mass unit definitionsexact definition

    The engine normalizes geometry to metres, volume to cubic metres, and mass to kilograms before display conversion.

  • Rectangular-prism volume relationshipmathematical relationship

    Volume equals normalized length multiplied by normalized width and normalized depth.

  • User-selected common depth presetuser configurable assumption
  • User-configured extra material allowanceuser configurable assumption
  • User-configured material densityuser configurable assumption

    No universal gravel density is assumed. Confirm density with the selected material supplier.

  • User or supplier-configured purchasing incrementuser configurable assumption

    The calculator rounds upward only when an explicit increment is supplied.

  • User-entered material unit costuser configurable assumption

    No live pricing or supplier pricing is used.

Normalized final volume: 2.49 m³

Normalized estimated mass: 3,987.01 kg

gravel-crushed-stone · v1.0.0 · released 2026-08-13

Owner: SolverOrg maintainers · Reviewed 2026-08-13

Method

The engine calculates each rectangular area with shared project-volume geometry, applies your selected allowance, then estimates mass from a required user-configured density before applying only the selected purchasing increment.

Worked example

A 20 ft by 12 ft area at 4 in starts at 2.96 yd³. A 10% allowance produces 3.26 yd³ before the selected half-yard order increment is rounded upward.

Confirm the material assumption

Moisture, gradation, compaction, material type, and the supplier specification can change actual weight. This takeoff is planning guidance, not geotechnical or structural advice. Confirm density, order increments, and the material basis with your supplier.

Related tools

Cubic Yard Calculator — compare project volume without a material assumption.

Concrete Calculator — plan concrete instead of loose aggregate.