This stepping stone concrete calculator finds how much concrete you need to pour round stepping stones. Enter the diameter, thickness, and quantity above to get the total in cubic feet and cubic yards.
How is the volume calculated?
One stone (ft³) = π × radius² × thickness (in feet) Total = One stone × quantity Cubic yards = Total (ft³) ÷ 27
Example calculation
For 10 stones, 18 in diameter (radius 0.75 ft), 2 in thick:
- One stone = π × 0.75² × 0.167 = 0.295 ft³
- Total = 0.295 × 10 = 2.95 ft³ = 0.11 yd³
Related calculators
Frequently Asked Questions
How much concrete for a round stepping stone?
The volume of one stone is pi times the radius squared times the thickness. An 18-inch, 2-inch-thick stone uses about 0.3 cubic feet.
How many stepping stones does a cubic yard make?
A cubic yard is 27 cubic feet, so it yields roughly 90 stones at 0.3 cubic feet each.
How thick should a stepping stone be?
Two inches is typical for garden stepping stones; use 3 inches for stones that bear vehicle or heavy foot traffic.