Previewing an option does not change the project. Only the option you explicitly choose is committed to the purchase list.
Whole-bag calculation
Bags = ceil(order ft³ ÷ yield ft³ per bag); carried lb = bags × nominal bag lb
Each bag size is calculated independently from its own editable yield. The tool never converts one bag count from another by weight ratio.
Produced volume is bags times yield. Rounding overage is produced volume minus the order volume. An optional subtotal is bag count times the price you entered.
Worked example: compare three sizes for 44.00 ft³
At the editable presets, 40 lb at 0.30 ft³ gives ceil(146.67) = 147 bags and 5,880 lb nominal; 60 lb at 0.45 ft³ gives ceil(97.78) = 98 bags and 5,880 lb; 80 lb at 0.60 ft³ gives ceil(73.33) = 74 bags and 5,920 lb.
With a user-entered price of $7.25 per 80 lb bag, 74 × $7.25 = $536.50. Quantity is unchanged by adding a price. These values match normative Fixture A.
Editable yield, waste, and price
The 40, 60, and 80 lb planning presets are 0.30, 0.45, and 0.60 ft³ per bag, reviewed July 11, 2026. They are not universal manufacturer claims; confirm the label and edit the value when it differs.
Prices are optional local inputs. A neutral large-count notice appears only above 100 bags and is a prompt to review logistics, not a recommendation to choose bulk.
Commit one purchase scenario
Review 40, 60, and 80 lb bags alongside bulk volume, then explicitly choose one scenario for the purchase list. Changing that choice replaces the previous one; alternatives never accumulate as purchases.
Comparison, not a purchase recommendation
Nominal bag weight is not the mixed concrete weight. This page does not model availability, pallet count, mixing time, delivery economics, fees, minimums, taxes, labor, or equipment.
A per-yard subtotal and an all-in supplier quote are alternative views and are never added together. Local costs omitted from the model are not treated as zero.
Sources and review dates
- Concrete Cal calculation method v1.0 · Reviewed 2026-07-11 · Planning method
- QUIKRETE concrete quantity calculator · Reviewed 2026-07-11 · Official source
- QUIKRETE Form-and-Pour product brochure · Reviewed 2026-07-11 · Official source