Rip rap calculator

10 by 10 ft at 12 in, 1.5 ton/yd: 5.56 tons.

Voids and a ragged bank. Leave at 0 until you know the spec wants extra.

Job sheet

Plumb rip rap job sheet

12 in thick.

  • Yards0.14 cu yd
  • Tons5.56 tons1.5 tons per cubic yard.
Plumb rip rap job sheet
12 in thick.

Yards: 0.14 cu yd
Tons: 5.56 tons (1.5 tons per cubic yard.)

Yards, then tons

Cubic feet are area times thickness in feet. Divide by 27 for yards. Tons are yards times the tons-per-yard box. Pea gravel and crushed stone at driveway depths are gravel. Decorative rock is river rock. A yard’s weight for other materials is yard weight.

FAQ

How many tons of rip rap?

A 10 by 10 foot area at 12 inches is 3.7 cubic yards. At 1.5 tons per yard that is 5.56 tons. The 1.5 figure is a planning density. The scale ticket replaces it.

How thick should the layer be?

A common erosion-control rule is about twice the nominal stone size. Six inch stone starts this form at 12 inches. Type the thickness the spec calls for. This page does not design a channel.

Sources

  1. NIST Handbook 44: A cubic yard is 27 cubic feet. A short ton is 2,000 pounds. Tons per yard is the quarry’s number.
  2. Engineering ToolBox, dirt and rock densities: Solid rock is far heavier than a loose pile. 1.5 tons per cubic yard is about 3,000 lb/yd³, a loose-rock planning figure, not limestone at 160 lb/cu ft.