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Concrete Calculator (Volume)

Calculate how much concrete you need for slabs, walls, footings, round columns, round slabs, and stairs. Get cubic yards, cubic feet, cubic meters, pre-mix bag counts, ready-mix truck loads, and a downloadable PDF estimate.

Volumes are geometric estimates. Always add waste for spillage and uneven subgrade, and order a little extra rather than running short. For planning purposes only.

Pour Details
1 Shape & Dimensions
ft
×
ft
in
4" = patios/sidewalks; 5-6" = driveways/garages
×
ft
in
×
in
×
in
Sonotube sizes: 8", 10", 12", 16", 18", 24"
ft
×
ft
in
×
in
×
in
Typical: 10-11" run, 7-7.75" rise
ft
steps
+
in
Assumes a solid (filled) staircase. Platform = top landing depth
2 Mix Options
10%
Most pros add 5-10% for spillage, uneven base, and form bulge
Yields: 40 lb ≈ 0.30 ft³ | 60 lb ≈ 0.45 ft³ | 80 lb ≈ 0.60 ft³
3 Cost Estimate (optional)
$ / cu yd
2024-2025 typical: $125 - $180 per cu yd (short-load fees may apply under 1 yd)
$ / bag
80 lb bags typically $5 - $7 each
Concrete Needed
Total Concrete To Order
—
Enter your pour details to begin
Cubic Yards (w/ waste) —
Cubic Feet (w/ waste) —
80 lb Bags —
Volume Breakdown
Shape —
Base volume no waste—
Waste allowance —
Total volume (cu ft)—
Total volume (cu m)—
Ready-mix truck loads 9 cu yd—
ORDER (CU YD)—
Cubic Meters —
Est. Ready-Mix Cost —
Est. Bagged Cost —
Bags Needed by Bag Size
Pre-mix bags required (rounded up)
All Bag Sizes — Your Pour
Bag SizeYieldBags NeededTotal WeightEst. Cost

Bag counts cover the full — ft³ (waste included). Bag cost uses your bag price scaled per size.