Concrete Calculator Add shapes (slab, wall, column, footing, hole, stairs, curb), choose units, and we’ll total the concrete volume. Includes waste and bag estimates. Region / Unit system Metric (m / cm) US / Imperial (ft / in) Length unit meters (m) centimeters (cm) Waste / overage (%) Add 5–15% for spillage, uneven subgrade, etc. Bag estimator Off Metric bags (L yield) US bags (ft³ yield) Custom yield Select bag (approx. yield) 20 kg ≈ 9 L (0.009 m³) 25 kg ≈ 11 L (0.011 m³) 30 kg ≈ 14 L (0.014 m³) 40 kg ≈ 18 L (0.018 m³) 50 kg ≈ 22 L (0.022 m³) Edit via Custom if your bag shows a different yield. Select bag (approx. yield) 40 lb ≈ 0.30 ft³ 50 lb ≈ 0.375 ft³ 60 lb ≈ 0.45 ft³ 80 lb ≈ 0.60 ft³ 90 lb ≈ 0.675 ft³ Approximate; check your bag’s “Yields” table. Custom bag yield m³ per bag ft³ per bag liters per bag Decimals Number format Plain 1,234.56 Copy Shareable Link + Add Shape Template: Slab + Footing Bulk Paste Calculate Reset Bulk paste (one per line): Shape | dims... | label Shapes & required dims by current unit (L/W/H are length/thickness): slab | length | width | thickness | Label wall | length | height | thickness | Label footing | length | width | depth | Label column | diameter | height | Label hole | diameter | depth | Label stairs | width | tread | riser | steps | Label curb | length | width | height | Label Insert Hide # Shape Dimensions Label Volume Subtotal volume— Waste / overage— Total volume— Bags (est.)— m³— liters— ft³— yd³— Copy Summary Export CSV Print