How much does a 20×20 concrete slab cost?
A 20×20 ft concrete slab (400 sq ft) costs $2,400–$4,800 at 4" thick and $2,800–$5,200 at 5" thick. The wide range reflects regional labor differences and finish type.
Calculators
The Concrete Calculator
Free concrete slab cost estimator with material, labor and site prep breakdowns
- Community votes0
- DR by Ahrefs0 no change since last check
Ahrefs Domain Rating set in type 6 Nov 2026, reset 4 Nov 2026.
A free online tool to calculate concrete slab costs by size, project type and region, with detailed breakdowns of materials, labor and site preparation.
The story so far
The Concrete Calculator is a free online estimating tool for DIYers, homeowners and contractors. It calculates concrete slab costs by dimensions, thickness, and local pricing, showing material, labor, delivery and site preparation breakdowns. The tool works for patios, driveways, garage floors, shed foundations and basement floors at various thickness levels and finishes. Every calculation uses standard volume formulas, published bag yields and explicit waste assumptions so users can see how each number is produced. Results are planning estimates to support ordering decisions and supplier conversations, not replacements for local codes or professional site checks.
Typeset features
- Material, labor and delivery cost breakdowns
- Pre-calculated costs for common slab sizes
- Multiple calculator tools including rebar, yard, bag and footing
- No sign-up required, data stays in browser
Pricing
Pricing model: Free
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The Concrete Calculator metrics
| Metric | Value |
|---|---|
| Domain Rating | 0 no change since last check |
| Trust Flow | 0 no change since last check |
| Citation Flow | 16 no change since last check |
| Referring domains | 4 no change since last check |
| External backlinks | 176 no change since last check |
Ahrefs Domain Rating set in type 6 Nov 2026, reset 4 Nov 2026. Majestic set 4 Nov 2026, reset 4 Nov 2026. Link data typeset by Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.
The Concrete Calculator domain colophon
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| Domain age | 4 months |
|---|---|
| Registered | |
| Expires | |
| Registrar | Cloudflare, Inc. |
| DNSSEC | Not signed |
The Concrete Calculator launch colophon
Measured after The Concrete Calculator went live on Zivaro Launch on 4 November 2026.
- Domain Rating (Ahrefs)
- 0 no change since launch
- 0 at launch (4 Nov 2026), 0 on 5 Nov 2026
- Trust Flow (Majestic)
- 0
- First measured 4 Nov 2026
- Referring domains (Majestic)
- 4
- First measured 4 Nov 2026
Day 2 since launch. Next receipt: day 30, 4 Dec 2026. These are measurements, not proof of cause: many things move these numbers. Figures we have not measured are left out.
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Free tips from Zivaro Launch for getting ready, launch day, the week after and what to do next.
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Questions and answers
What's the average cost of a concrete slab per square foot?
As of 2026, concrete slabs cost $6–$12 per square foot installed for most residential projects. Basic broom-finish patios cost $6–$8/sq ft, driveways with rebar cost $7–$13/sq ft, and garage floors at 6" thick cost $8–$15/sq ft.
What factors affect concrete slab cost the most?
Four factors drive slab cost: thickness (4" vs 6" adds ~50% to material volume), reinforcement (rebar vs wire mesh vs none), site access (difficult terrain or long pump distance adds labor), and finish type (broom, stamped, polished, or exposed aggregate each carry different labor rates).
Is a concrete slab cheaper than pavers?
For most projects, concrete slabs ($6–$12/sq ft installed) are 30–50% cheaper than pavers ($10–$25/sq ft installed). Pavers require more labor for base prep and individual placement, though they offer easier repairs.
How much does it cost to pour a concrete slab yourself?
DIY concrete slab cost runs $3–$5/sq ft for materials only. A 20×20 slab at 4" requires roughly 4.94 cubic yards, or $620–$865 in concrete plus $200–$400 in other materials.
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