View Full Version : estimate weight of boulders

03-09-2009, 02:03 PM
Is there a reasonable way to estimate how heavy boulders are? For example, on one corner of a yard, I'd like to make a broken row of 1'x1'x2' and 2'x2'x2' boulders to break up an extended mount that's being considered. Since I don't have the right equipment and will have to rent something, I'd like to make sure I rent something that would be able to handle this. Thanks.

03-09-2009, 04:12 PM
i depends on the stone.

for the sizes your looking for a s185 bobcat will work fine.

if you need to know how much they way google the cubic foot weight of the stone and do the math.

Kate Butler
03-09-2009, 06:56 PM
Granite is plus or minus 167 lbs. per cubic foot. 2'x2'x2' would be 8 cu.ft. and far too heavy for a small loader. If the boulders are close to round, you can do a bit of math to determine if the weight would be OK for your equipment.

03-09-2009, 08:55 PM
an 8cu stone at 1336 lbs is not way too heavy for most skid steers. Unless you are talking about walk behind mini skid steers or something. We have 750lb concrete tractor weights that I can move with an ASV PT30 wich only has a 800ROC and it lifts it just fine. Wouldn't lift them all the way obviously, but just to move them around it's fine. I can lift two of them (1500) even with an S130, and two are lifted no problem by an RC-50 (1900lb ROC) or S185 (1850lb ROC). As long as your in the 1500+ lb ROC you could move the stone around without flipping the machine. An S220 or T300 size machine could move these around no problem. I would reccomend using a good size excavator with a thumb if you have to set a lot of stones, but to lift a big stone you'll need a good size machine.

03-10-2009, 02:51 PM
an S185 has a lifting weight of 1850 lbs. This is the model most rental companies havve here. check your area and ask them model and or lifting capacity. to find the lifting power on newer bobcats add a zero to the model number.

B & B Yardscape
03-11-2009, 10:26 AM
The rated lifiting capacity is half of what it can actually lift. I think any skid steer you rent will be able to handle those rocks just fine.

03-11-2009, 11:27 AM
it's half of what tips them over, not what they can actually lift, but same deal, half of what you can use them for before they don't work anymore

03-14-2009, 01:17 PM
Your supplier shoulf be able to give you an estimate on the weight of whatever type of boulder your using