Landscape Boulder Weight Calculator
Estimate the weight of landscape boulders from bounding dimensions, an irregular-shape factor, material density, quantity and delivery capacity.
Default project preview
3.49 US tons
Bounding-box volume
19.25 ft³
Estimated stone volume
10.59 ft³
Weight per boulder
0.87 US tons
Delivery loads
1
Calculator
Build the material order
Your order will appear here
Enter the project details and calculate a rounded material estimate.
Input and output guide
What each value means
The labels and units below are part of this calculator’s visible methodology. Replace every default with measurements or product data from the actual project.
Average boulder length
Enter this project assumption in ft. The current imperial default is 3.5 ft.
Average boulder width
Enter this project assumption in ft. The current imperial default is 2.5 ft.
Average boulder height
Enter this project assumption in ft. The current imperial default is 2.2 ft.
Irregular-shape factor
Enter this project assumption in %. The current imperial default is 55 %. Minimum: 10. Maximum: 100.
Stone density
Enter this project assumption in lb/ft³. The current imperial default is 165 lb/ft³.
Boulder quantity
Enter this project assumption in a unitless value. The current imperial default is 4. Minimum: 1.
Delivery capacity
Enter this project assumption in US tons. The current imperial default is 10 US tons.
Price per ton or tonne
Enter this project assumption in a unitless value. The current imperial default is 190. Minimum: 0.
How to read the outputs
Bounding-box volume
length × width × height. Default preview: 19.25 ft³.
Estimated stone volume
55% shape factor. Default preview: 10.59 ft³.
Weight per boulder
density-based estimate. Default preview: 0.87 US tons.
Delivery loads
10 US tons capacity. Default preview: 1.
Unused load capacity
after full-load rounding. Default preview: 6.51 US tons.
Stone cost
weight-based material price. Default preview: $663.84.
Methodology
Transparent calculation
BuildMeter converts every input to a consistent internal unit, applies the selected allowance, and rounds products up to whole purchasable units.
Estimated volume = bounding-box volume × shape factor. Weight = estimated volume × density; delivery loads are rounded up.
FAQ
Landscape Boulder Weight Calculator questions
What shape factor should I use?+
A lower factor represents a more rounded or irregular boulder. Compare the bounding box with the actual occupied volume.
Is the estimate safe for crane selection?+
No. Lifting equipment must use verified weights and a qualified lift plan.
Why does stone density vary?+
Rock type, mineral composition, weathering and moisture can change density.