Gravel calculator

Estimate gravel or sand by volume, weight, bags and cost.

Get started

Choose a known area, rectangle or circle and enter the depth.
Choose the material. Use More options to enter a custom density or bag capacity.

Example

Input

200 ft² at 3 in, gravel at 1,680 kg/m³.

Expected result

50 ft³ (1.42 m³), about 2,379 kg.

Try it

Good to know

The calculation runs in your browser. Use consistent units in fields with no explicit unit.

Calculation method

Multiply area by depth, then apply the allowance. Mass equals volume times bulk density. For bag prices, round up to whole bags before multiplying by price. Use the supplier’s bulk density when available.

V=Ad(1+w/100),\qquad m=\rho V,\qquad N=\left\lceil\frac{m}{m_{\rm bag}}\right\rceil\ \text{or}\ \left\lceil\frac{V}{V_{\rm bag}}\right\rceil

Calculation mode

Known area

Area
Area unit · cm² / m² / in² / ft² / yd² / acre / ha
Depth
Depth unit · mm / cm / m / in / ft / yd
Material · Gravel / Gravel and sand / Dry sand / Wet sand / Custom density
Unit price
Price unit
Density
Density unit · kg/m³ / g/cm³ / lb/ft³
Bag capacity
Bag unit · ft³ / yd³ / m³ / L / lb / US ton / kg / t
Waste allowance · %

Rectangle

Length
Length unit · mm / cm / m / in / ft / yd
Width
Width unit · mm / cm / m / in / ft / yd
Depth
Depth unit · mm / cm / m / in / ft / yd
Material · Gravel / Gravel and sand / Dry sand / Wet sand / Custom density
Unit price
Price unit
Density
Density unit · kg/m³ / g/cm³ / lb/ft³
Bag capacity
Bag unit · ft³ / yd³ / m³ / L / lb / US ton / kg / t
Waste allowance · %

Circle

Diameter
Diameter unit · mm / cm / m / in / ft / yd
Depth
Depth unit · mm / cm / m / in / ft / yd
Material · Gravel / Gravel and sand / Dry sand / Wet sand / Custom density
Unit price
Price unit
Density
Density unit · kg/m³ / g/cm³ / lb/ft³
Bag capacity
Bag unit · ft³ / yd³ / m³ / L / lb / US ton / kg / t
Waste allowance · %