Enter the boulder length, boulder width, boulder height, and boulder 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 boulder length (ft)
• W is the boulder width (ft)
• H is the boulder 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