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Free DIY hardscape planner for poured or molded stepping stones. Enter each stone’s length, width, and thickness in inches, how many you need, and a wastage allowance. We show cubic feet per stone, total volume, cubic yards, and a rounded-up count of 80 lb premixed concrete bags using a typical ~0.6 ft³ yield per bag.
Last updated: April 8, 2026
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Overage for spillage, irregular pours, and touch-ups.
Per stone
0.296 ft³
Total with 10% extra
3.91 ft³
0.145 yd³
80 lb bags (≈ 0.6 ft³ each)
7
Volumes assume rectangular stones and a typical 80 lb bag yield (~0.6 ft³); check your mix bag for exact yield and add margin for forms, spillage, and finishing.
Inches → ft³
÷ 1,728
Rectangular mold assumption.
Sum
All stones
Same size for every stone in the run.
%
Adjustable
Typical 5–15% for small pours.
÷ 0.6 ft³
Round up
Match the label on your actual mix.
÷ 27 ft³
yd³
Compare to ready-mix minimums.
Gravel / sand
Separate
Use crushed stone and sand calculators for bedding layers.
16×16×2 in, 12 stones, 10% wastage
Total ft³
3.91 ft³
80 lb bags (est.)
7
We convert each stone’s dimensions from cubic inches to cubic feet by dividing by 1,728. Multiplying by quantity gives gross volume before wastage. Your wastage percentage scales the total up. Bags divide total cubic feet by an approximate yield per 80 lb bag and round up to the next whole bag.
ft³ per stone = (L × W × T in³) ÷ 1,728total ft³ = ft³ per stone × quantity × (1 + wastage% ÷ 100)bags (80 lb) = ceil(total ft³ ÷ 0.6)Base materials? Try crushed stone and sand.
Get a Custom Calculator for Your SiteVolume scales linearly with thickness. A 25% thicker stone needs roughly 25% more mix before wastage— compare bag counts before you buy.
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