Concrete Yield Calculator Guide

A concrete yield calculator compares three numbers before you buy or dispute concrete: the measured project volume, the expected yield from bags or ready-mix, and the actual volume shown by a supplier quote or delivery ticket. That is different from a simple volume calculator. Volume tells you what the forms should need. Yield checks whether the product, ticket, waste factor, and jobsite conditions explain the amount you ordered or placed.

Use the Concrete Volume Calculator to measure slabs, walls, footings, columns, and steps. Use the Concrete Bag Calculator when the yield comes from 40, 60, or 80 lb bags. If the result is tied to a supplier invoice, compare the delivered total in the Concrete Cost Calculator and review the scope in the Concrete Quote Reviewer.

If the issue appears after the truck arrives, read this with the Ready-Mix Delivery Ticket Checklist. This page is a planning guide, not a concrete quality test or engineering decision.

Quick answer

Use this yield check:

project cubic feet =
  length ft x width ft x thickness in / 12

project cubic yards =
  project cubic feet / 27

order volume =
  project cubic yards x (1 + waste percent / 100)

For bagged concrete:

expected bag yield =
  bag count x printed bag yield in ft3

For ready-mix:

ready-mix yield check =
  delivered yd3 on ticket
  compared with measured project yd3 after waste and field conditions

Do not decide a load was short from the invoice alone. First check dimensions, thickness, over-excavation, base level, waste, spill, returned concrete, minimum billable yards, and the delivery ticket.

Yield check in one screen

This is why yield belongs in the buying workflow. A correct volume calculation can still look wrong if the base is low, the slab is thicker than planned, a supplier bills a minimum load, or the bag yield used in the estimate does not match the product label.

Bag yield calculator table

Common planning yields are useful for a first pass, but final buying should use the product label.

For the fuller bag table, use the Concrete Bag Yield Chart. For the reverse conversion, use How Many Yards per Bag of Concrete. If you only need cubic feet per bag, use the Cubic Feet of Concrete per Bag guide.

Example: 10x10 slab bag yield

A 10x10 slab at 4 inches is:

100 sq ft x 4 in / 12 = 33.33 ft3
33.33 ft3 / 27 = 1.23 yd3 before waste
1.23 yd3 x 1.10 = 1.36 yd3 with 10% waste

With common 80 lb bags:

33.33 ft3 x 1.10 / 0.60 ft3 per bag = 61.1 bags

Round up to 62 80-lb bags. If the store cart only has 50 bags, the expected yield is:

50 bags x 0.60 ft3 = 30 ft3 = 1.11 yd3

That is not enough for the 10x10 slab with waste. The issue is not a mystery yield loss. The buying plan is short.

Example: ready-mix ticket vs measured volume

Suppose a patio measures 12x12 at 4 inches:

144 sq ft x 4 in / 12 = 48 ft3
48 ft3 / 27 = 1.78 yd3 before waste
1.78 yd3 x 1.10 = 1.96 yd3 with waste

If the supplier ticket shows 2.0 yd3 delivered, the order roughly matches the measured volume with a normal cushion. If the invoice bills 3.0 yd3 because of a 3 yd3 minimum, that is a minimum-load pricing issue, not proof that 3 yd3 should appear in the forms.

Use the Minimum Concrete Delivery Order Guide to separate usable yards from billable yards. Use the Concrete Short Load Fee Guide if the supplier uses a fixed small-load fee instead of a minimum billable yardage.

Yield discrepancy checklist

Before you call a supplier, contractor, or inspector about a possible yield problem, collect the same facts in one place.

For post-delivery records, use the Ready-Mix Delivery Ticket Checklist. If returned yards, surplus material, or a return-to-plant policy appears on the ticket, use the Returned Concrete Fee Guide before treating the issue as only a yield discrepancy. If the question is how much extra should have been ordered before the pour, use the Concrete Waste Factor Calculator Guide before blaming the ticket. For access-related loss, check the Concrete Wheelbarrow Distance Calculator Guide and Concrete Truck Chute Reach Guide.

Common reasons yield looks short

For pump jobs, use the Concrete Pump Cost Calculator Guide. For washout and cleanup costs, use the Concrete Washout Fee Guide.

Quote worksheet

Use this worksheet when yield is part of a quote review.

If a contractor bid includes concrete as one lump sum, compare the yield basis in the Concrete Bid Comparison Worksheet. If the number changed after work started, review the Concrete Change Order Cost Guide.

Sources and checks

FAQ

What is concrete yield?

Concrete yield is the amount of mixed concrete volume expected from a bag, batch, truck, or order. In planning, it helps compare project volume with the bags or ready-mix yards being bought.

How do I calculate bag yield?

Multiply the number of bags by the printed yield per bag. For example, 62 common 80 lb bags at 0.60 ft3 each should produce about 37.2 ft3 before normal field loss.

How do I check ready-mix yield?

Start with measured form volume, add the waste or order cushion, then compare that number with the delivery ticket and quote. If something looks wrong, review thickness, base level, returned concrete, minimum billable yards, and supplier records before drawing conclusions.

Is billable yardage the same as concrete yield?

No. Billable yardage is an invoice rule. Concrete yield is the volume expected from the material. A supplier can bill 3 yd3 minimum for a 1.96 yd3 job without claiming that the forms should use all 3 yd3.

Can this prove a supplier shorted concrete?

No. This page helps organize the calculation and records. Yield disputes, quality questions, testing, warranty, and payment decisions should be reviewed with the supplier, contractor, inspector, or qualified local professional.

Next step

Measure the project with the Concrete Volume Calculator, convert bags with the Concrete Bag Calculator, then save the supplier or contractor comparison in the Concrete Quote Reviewer.