What does One Man, Two Man, Three Man Mean?

When it comes to explaining sizes of quarry rock, you may hear descriptors such as “Half Man”, “One Man” or “Rockery Rock” when referencing sizes. So what do these quarry rock sizes actually mean?

Most rock suppliers offer extensive sizing options when choosing boulders. Smaller sizes can be more appealing to the eye when it comes to curb appeal, while bulkier boulder sizes are sought out for stability in projects such as erosion control.

Rather than measure each individual stone, they are broken down into separate categories based on rough diameter and weight. Kenco’s Rocklift comes in 3 unique sizes to pick each one of these sizes.

Washington State Department of Transportation (WSDOT) uses the following rock size chart when referring to these larger size rocks and boulders.

Rock SizeRock WeightAverage DimensionsKenco Rocklift Option
Half Man25 – 50 lbs6″ – 12″MG3000
One Man50 – 200 lbs12″ – 18″MG3000
Two Man200 – 700 lbs18″ – 28″MG3000
Three Man700 – 2,000 lbs28″ – 36″MG6000
Four Man2,000 – 4,000 lbs36″ – 48″MG12000
Five Man4,000 – 6,000 lbs48″ – 54″MG12000
Six Man6,000 – 8,000 lbs54″ – 60″MG12000