The density of gravel varies depending on the type of gravel, its composition, and its moisture content.

Here's a general range for the density of gravel:

* Dry gravel: 1300-1600 kg/m³ (81-100 lb/ft³)

* Wet gravel: 1600-1900 kg/m³ (100-120 lb/ft³)

Factors affecting gravel density:

* Type of gravel: Different types of gravel, such as crushed stone, river gravel, or pea gravel, have different densities.

* Size of gravel: Smaller gravel particles have a higher surface area to volume ratio, which can increase density.

* Moisture content: Wet gravel is denser than dry gravel because water adds weight.

* Porosity: Gravel with more void space (porosity) will have a lower density.

Note: These are just approximate values. To determine the exact density of a particular type of gravel, it's best to test it yourself or consult with a supplier.