🧱 Concrete Price Calculator: Cost Per Yard & Slab
📋 Table of Contents
How much will your concrete project actually cost? That is the first question every homeowner or contractor asks before ordering a single yard of ready-mix. The answer depends on three numbers: your slab’s volume in cubic yards, the price per yard in your area, and any delivery or finishing fees on top.
This free concrete price calculator converts your slab dimensions (length, width, thickness) into cubic yards, then adds your local price per yard, delivery fee, and finishing cost to give you a complete project estimate in seconds — no spreadsheet required.
⚡ TL;DR – Quick Summary
- 🧱 Volume formula: Length × Width × Thickness (ft) ÷ 27 = cubic yards
- 💵 Ready-mix concrete costs $125–$165 per cubic yard in the US (2026)
- 🚚 Delivery fees typically add $60–$200 per truck load
- 📐 Always order 5–10% extra to cover waste and uneven subgrade
- ⏱ Concrete reaches full strength at 28 days; safe for foot traffic at 3 days
- 🔢 Use the calculator below — enter dimensions, get instant cost breakdown
Concrete Price Calculator
Estimate cubic yards & total project cost instantly
📋 Step-by-Step Solution
🪜 How to Use This Concrete Price Calculator
The calculator works in two modes: Slab / Patio for flat horizontal pours, and Footing / Column for vertical or rectangular structural pours. Here is how to get your estimate in under a minute:
- Choose your mode — click “Slab / Patio” for driveways, patios, and floors; click “Footing / Column” for foundation footings or fence posts.
- Enter your dimensions — length and width in feet, thickness in inches (slab mode) or all dimensions in feet (footing mode).
- Enter your local price per cubic yard — call your nearest ready-mix supplier for a quote, or use $140 as a US national average starting point.
- Add optional fees — delivery charge (one-time) and finishing cost per square foot if you are hiring a finisher.
- Click Calculate — you will see total cubic yards, a +10% waste recommendation, and a full cost breakdown.
- Add 5–10% to your order — the chip shows the recommended order quantity with waste factored in.
In my experience helping students and homeowners work through construction math, the single most common mistake is forgetting to convert thickness from inches to feet before multiplying. People enter 4 for thickness and multiply by 4 feet instead of 0.333 feet — that gives a result 12 times too large. This calculator handles that conversion automatically, which is exactly why a dedicated tool beats a back-of-envelope calculation every time.
📐 The Concrete Volume Formula Explained
The core formula is simple: volume in cubic yards equals the slab’s length times width times thickness (all converted to feet), divided by 27 — because there are 27 cubic feet in one cubic yard.
where T_ft = Thickness_inches ÷ 12
Total Cost = (Volume × Price/yd³) + Delivery Fee + (Area × Finishing $/sq ft)
| Symbol | Meaning | Unit |
|---|---|---|
| L | Slab length | feet (ft) |
| W | Slab width | feet (ft) |
| T_in | Slab thickness (as measured) | inches (in) |
| T_ft | Slab thickness (converted) | feet (ft) = T_in ÷ 12 |
| V | Volume of concrete | cubic yards (yd³) |
| 27 | Cubic feet per cubic yard | constant |
| P | Price per cubic yard | USD ($/yd³) |
| D | Delivery fee | USD ($) |
| F | Finishing cost per sq ft | USD ($/ft²) |
SI note: In metric countries, use meters for all dimensions. Volume in cubic meters (m³) = L × W × T_m. Concrete is priced per m³ internationally (roughly $100–$140/m³ equivalent). The calculator above uses the US imperial system (feet, inches, cubic yards) which is standard for US ready-mix ordering.
📊 Visual: Slab Dimensions to Cubic Yards
┌─────────────────────────────────┐ │ L = 20 ft │ │ ┌───────────────────────────┐ │ │ │ │ │ W = 10 ft │ │ CONCRETE SLAB │ │ │ │ │ │ │ └───────────────────────────┘ │ │ T = 4 in = 0.333 ft │ └─────────────────────────────────┘ Step 1: Cubic feet = 20 × 10 × 0.333 = 66.67 cu ft Step 2: Cubic yards = 66.67 ÷ 27 = 2.47 yd³ Step 3: +10% waste = 2.47 × 1.10 = 2.72 yd³ ← order this Step 4: Cost @ $140/yd³ = 2.47 × 140 = $345.80
🔢 Worked Examples
- Convert thickness: 4 in ÷ 12 = 0.333 ft
- Cubic feet: 10 × 12 × 0.333 = 40.0 cu ft
- Cubic yards: 40.0 ÷ 27 = 1.48 yd³
- Concrete cost: 1.48 × $140 = $207.20
- Delivery: $120.00
- Total: $327.20 (order 1.63 yd³ with 10% waste)
- Convert thickness: 6 in ÷ 12 = 0.5 ft
- Cubic feet: 20 × 10 × 0.5 = 100.0 cu ft
- Cubic yards: 100.0 ÷ 27 = 3.70 yd³
- Concrete cost: 3.70 × $155 = $573.70
- Delivery: $150.00
- Finishing: 200 sq ft × $1.50 = $300.00
- Total: $1,023.70 (order 4.07 yd³ with 10% waste)
- Volume per footing: 2 × 1.5 × 1 = 3.0 cu ft
- Total volume (4 footings): 3.0 × 4 = 12.0 cu ft
- Cubic yards: 12.0 ÷ 27 = 0.44 yd³
- Concrete cost: 0.44 × $145 = $64.44
- Delivery: $100.00
- Total: $164.44 — note: most suppliers have a minimum order of 1 yd³
⚠️ Common Mistakes (and How to Avoid Them)
| ❌ Wrong | ✅ Right |
|---|---|
| Using thickness in inches without converting to feet | Always divide inches by 12 before multiplying dimensions |
| Ordering exactly the calculated volume | Order 5–10% extra to cover waste and uneven subgrade |
| Forgetting the delivery fee in your budget | Add $60–$200 per truck load to your total estimate |
| Using one price quote from a single supplier | Get at least 3 local quotes — prices vary 15–25% by region |
| Confusing cement with concrete in cost estimates | Concrete is priced per cubic yard; cement is per bag for small jobs |
| Ignoring minimum order requirements | Most ready-mix plants require a minimum of 1 cubic yard per delivery |
Sources & References
Reviewed by Dr. Irfan Mansuri. External links open in a new tab and are provided for further reading and verification.