Primary material
62 bags
80 lb concrete mix
Use the calculated bag count as your buying starting point, then verify yield and pallet limits with the store.
Concrete cost calculator
Concrete slab cost calculator for material, labor, and installed price.
Estimate concrete yards, bag count, ready-mix material, bagged material, labor allowance, and total cost from one set of dimensions.
20 x 20 x 4 in slab
$3,015
ready-mix route estimate
Planning range
$1,879-$4,151
based on stored price bands
Cost intent
Quote-ready
material, labor, and scope notes visible
Quick reference
Concrete slab cost for common sizes
A 4 in slab with ready-mix material plus labor, low to high, from the price ranges on this page. Base prep, reinforcement, and finish upgrades are extra.
| Slab size | Cubic yards | Ready-mix + labor | Per square foot |
|---|---|---|---|
| 10 x 10 ft | 1.36 yd³ | $470 – $1,038 | $4.70 – $10.38 |
| 12 x 12 ft | 1.96 yd³ | $676 – $1,494 | $4.70 – $10.38 |
| 16 x 20 ft | 4.35 yd³ | $1,503 – $3,320 | $4.70 – $10.38 |
| 20 x 20 ft | 5.43 yd³ | $1,879 – $4,151 | $4.70 – $10.38 |
| 24 x 24 ft | 7.82 yd³ | $2,706 – $5,977 | $4.70 – $10.38 |
Cost follows volume: a 6 in slab uses 50% more concrete than a 4 in slab of the same area.
Quick cost answers
Common concrete cost checks
10 x 10 patio
100 sq ft at 4 in
$754
ready-mix route, $7.54/sq ft
bagged route: $907
20 x 20 slab
400 sq ft at 4 in
$3,015
ready-mix route, $7.54/sq ft
bagged route: $3,609
16 x 20 driveway panel
320 sq ft at 5 in
$2,575
ready-mix route, $8.05/sq ft
bagged route: $3,169
Quote scope checklist
Ask whether the quote includes excavation, base gravel, forms, reinforcement, delivery, pump or buggy work, finishing, control joints, cleanup, and haul-away.
Shopping list
Ready to price and order
Use the calculated quantities as a starting cart, then compare store availability, delivery fees, pallet limits, and local ready-mix minimums before buying.
Large pours
Ready-mix quote check
For high bag counts, compare the bagged route against local ready-mix minimums, delivery, access, and unload time.
Optional base
Gravel base
Base depth is project-specific. Estimate it separately before adding bags or bulk gravel to the order.
Optional forms
Forms and stakes
Plan lumber, stakes, screws, release, and bracing around the perimeter and any step-downs or curves.
Store buttons open retailer search results for now. Confirm exact product yield, pickup, delivery, and pallet rules before ordering.
Formula shown
How the concrete cost calculation works
1. Estimate concrete volume
cubic feet = length ft x width ft x thickness in / 12
2. Add waste and convert to yards
cubic yards = cubic feet x (1 + waste) / 27
3. Compare material routes
ready-mix material = yd^3 x price per yd^3; bagged material = 80 lb bags x bag price
4. Add labor allowance
installed estimate = material cost + area sq ft x labor per sq ft
What is not included
The calculator does not price permits, demolition, excavation, base gravel, reinforcement, fiber, vapor barrier, concrete pump, delivery minimums, decorative finishes, sealing, drainage work, or local code requirements. Add those to contractor quotes before comparing bids.
Sources
- Quikrete product yields — bagged concrete mix yield references
- Sakrete bagged concrete references — common bag sizes and concrete mix guidance
- ConcreteNetwork concrete price guide — ready-mix and installed concrete cost context
Sources checked
Checked against
Bag yields checked against Quikrete and Sakrete product specs; price ranges against published concrete cost guides.
How we check our numbersLast updated: June 21, 2026
Estimate only.
This calculator is not a quote. Verify product yield, price, delivery minimums, and local conditions with your supplier or contractor before buying materials.
Related calculators
Move between quantity and cost
FAQ
Concrete cost questions
Answers for ready-mix vs bagged concrete, labor assumptions, cost ranges, and quote limitations.
How much does a concrete slab cost? + -
Concrete slab cost depends on slab size, thickness, local ready-mix price, bag price, labor, access, base prep, reinforcement, and finish. This calculator separates material and labor so you can adjust the assumptions.
How much does concrete cost per yard? + -
Ready-mix concrete typically runs about $125 to $175 per cubic yard delivered in 2026, before short-load fees on small orders. Mixing the same yard from 80 lb bags takes about 45 bags, which usually costs more in material but avoids a delivery minimum.
Is bagged concrete cheaper than ready-mix? + -
Bagged concrete can be convenient for very small pours, but ready-mix is usually easier and often cheaper per cubic yard once the project needs many bags. Compare both totals before buying.
What is included in the labor allowance? + -
The labor allowance is a simple per-square-foot planning number. It does not include permit fees, excavation, base gravel, reinforcement, pumping, demolition, hauling, or special finishes unless you add those outside the calculator.
Why does the calculator show a cost range? + -
The range uses the concrete price bands stored in the site material data. It is meant to show planning sensitivity, not a local quote.
Is this concrete cost estimate a contractor quote? + -
No. It is an estimate only. Verify quantity, ready-mix minimums, delivery fees, labor scope, finish, reinforcement, and site access with a supplier or contractor.