Slab 1
Length: — ft · Width: — ft · Thickness: — in
Buying method comparison
Ready-Mix vs. Concrete Bags Calculator
Compare the order quantity, bag workload, and your actual supplier fees in one result.
Project
Formula
Both methods start from the same concrete
Ready-mix and bags use one measured volume and one waste allowance. Ready-mix cost adds the price per yard and the fees you type. Bag cost multiplies the rounded bag count by the price you type. Empty prices do not change the quantity.
Common mistake
Comparing a bag price with a yard price that hides delivery
A lower price per bag is not a lower invoice if you still have to move several hundred bags. A lower price per yard is not cheaper until delivery, short-load, pump, and tax are written on the quote. This page keeps the workload visible and leaves the dollars for the cost calculator.
Worked quantities
Where the bag load stops being a small job
24 × 24 ft, 6 in is the first row past 500 eighty-pound bags, at 528 bags. ConcreteQty warns at that count because ready-mix is usually the practical way to place the same volume. No local price is assumed.
| Job | Order yd³ | 80 lb bags | 80 lb total weight |
|---|---|---|---|
| 4 × 4 ft, 4 in | 0.25 | 10 | 800 lb |
| 10 × 10 ft, 4 in | 1.50 | 62 | 4,960 lb |
| 12 × 20 ft, 4 in | 3.50 | 147 | 11,760 lb |
| 20 × 20 ft, 5 in | 7.00 | 306 | 24,480 lb |
| 24 × 24 ft, 6 in | 11.75 | 528 | 42,240 lb |
| 30 × 40 ft, 6 in | 24.50 | 1,100 | 88,000 lb |
Field check
Compare the same concrete volume
Both options begin with one measured volume and one waste allowance. Changing quantity between methods would make the price comparison misleading, so adjust the project before entering supplier or bag prices.
Field check
Include the invoice line items
A ready-mix quote can include delivery, short-load, pump, waiting, fuel, environmental, or tax charges. Enter only confirmed fees and keep notes on what each supplier included.
Field check
Price is not the only constraint
Bag count makes handling and mixing workload visible; ready-mix depends on truck access, placement readiness, and unloading time. The tool keeps both methods visible rather than declaring a universal winner.
Questions
What the ready-mix comparison answers
Does ConcreteQty fetch local prices?
No. Enter real quotes so the comparison reflects your supplier.
Are delivery fees included automatically?
No. Add each fee shown in the quote.
Does the tool force a recommendation?
No. Both methods stay visible; any convenience highlight explains its reason.
Next step
Add the supplier's fees before choosing bags
Bag yields follow the cited manufacturer data. See sources and review dates.