Concrete Slab Cost Calculator

How this calculator works

Slab geometry is converted to cubic yards and increased by the chosen concrete allowance. Material cost uses the entered price per cubic yard.

Labor is calculated from plan area, while preparation, reinforcement and delivery or short-load charges stay as explicit fixed inputs. This prevents one opaque price-per-square-foot assumption.

Use current written quotes for mix, pump, finish, excavation, forms, reinforcement, access, permits, taxes and minimums before budgeting.

Control example: 20 × 20 × 4 in slab

The slab is 400 ft² and requires 5.43 yd³ with 10% allowance. Use $160/yd³, $4/ft² labor, $1,200 prep and $300 delivery.

Concrete is $869.14 and the complete entered scenario totals $3,969.14.

Assumptions and limits

• Enter current supplier and contractor prices for the exact mix, placement, finish, site access, minimum load and scope in your ZIP code.
• Measurements describe one simple project geometry.
• Waste and package values are editable planning assumptions.
• It is a user-priced scenario, not a current local quote, bid, tax calculation, structural slab design, or guaranteed project cost.

Common measuring mistakes

• Mixing nominal dimensions with actual installed coverage.
• Skipping whole-package or stock-length rounding.
• Failing to verify the page’s stated measurement and product assumptions.
• Using a planning estimate outside the limitations stated on this page.

Sources

Product-specific values remain editable. These sources support the method and stated examples; they are not a universal substitute for your supplier’s current label.

• QUIKRETE concrete calculation training Supports slab volume geometry and finished-yield planning.
• GQ Calc methodology Documents why prices remain user-entered and line items are not represented as national averages.

Questions people ask