Enter the length, width, height and density into the calculator to determine the boulder weight.

Boulder Weight Formula

The following equation is used to calculate the weight of a boulder.

Wb = L*W*H*d

  • Where Wb is the Boulder Weight (lbs)
  • L is the length (ft)
  • W is the width (ft)
  • H is the height (ft)
  • d is the density (lbs/ft^3)
    • Sandstone Rock = 150 lbs/ft^3
    • Limestone Rock = 175 lbs/ft^3

To calculate the Boulder Weight, multiply the length, width, and height to get the volume, then multiply by the density.

What is the weight of a boulder?

A boulders weight is determined by its total volume and the density of the type of rock. Not all boulders have the same density.

How to Calculate Boulder Weight?

Example Problem:

The following example outlines how to estimate the weight of a boulder.

First, determine the length, width and height of the boulder.

In this case, the boulder is measured to be 5 ft, 6ft, and 4 ft respectively for the length, width, and height.

Next, determine the density of the rock material.

For this example, the rock is pure limestone which has a density of roughly 175 lbs/ft^3.

Finally, calculate the boulder weight using the formula above:

Wb = L*W*H*d

Wb = 5*6*4*175

Wb = 21,000 lbs