Concrete Calculator

Estimate the concrete you need for a slab — in cubic feet, cubic yards, and 60 lb / 80 lb bags — plus the 2026 delivered cost of ready-mix versus bagged mix.

📅 Updated: 2026-08-15 ✍️ Author: RenoFig Research Team 📊 Data: QUIKRETE yields · 2026 ready-mix $150–$200/cy ✅ Free & No Sign-Up

Calculator Inputs

10% standard for slab pours.

Results

Volume (cubic feet)—
Volume (cubic yards)—
80 lb Bags (0.6 cu ft)—
60 lb Bags (0.45 cu ft)—
Ready-Mix Cost (delivered)—
Bagged Cost (80 lb @ $5–$8)—

* Estimate only. Over-excavation, forming, and short-load fees add cost. Over ~1 cu yd, compare ready-mix delivery (often cheaper per yard).

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Formula & How It Works
StepFormula
Volume (cu ft)Length × Width × (Depth in ÷ 12) × (1 + Waste%)
Cubic yardscu ft ÷ 27
80 lb bags⌈ cu ft ÷ 0.6 ⌉
60 lb bags⌈ cu ft ÷ 0.45 ⌉
Ready-mix costcu yd × $150–$200 (2026 delivered)
Bagged cost80 lb bags × $5–$8 (2026 retail)

Standard yields: QUIKRETE publishes ~0.6 cu ft per 80 lb bag and ~0.45 cu ft per 60 lb bag of concrete mix. One cubic yard = 27 cu ft (≈45–60 bags). 2026 cost: ready-mix ~$150–$200/cu yd delivered; an 80 lb bag ~$5–$8 at retail (HomeAdvisor/Angi, Concrete Network, retrieved 2026-08-15).

Frequently Asked Questions

A cubic yard is 27 cubic feet. An 80 lb bag yields about 0.6 cu ft (≈45 bags per yard) and a 60 lb bag yields about 0.45 cu ft (≈60 bags per yard), per QUIKRETE published yields. Add ~5–10% for waste.
In 2026 ready-mix concrete runs about $150–$200 per cubic yard delivered (national averages from HomeAdvisor/Angi and Concrete Network, retrieved 2026-08-15). An 80 lb bag of mix costs about $5–$8 at retail. Once a job exceeds ~1 cubic yard, ready-mix delivery is usually cheaper than mixing bags by hand.
Typical residential slabs: 4 inches for patios, walkways, and shed floors; 3–4 inches for light-duty paths; 5–6 inches for driveways and garage floors that carry vehicles. Always check local code for your use.

Related Tools

Data sources & retrieved: 2026-08-15 — QUIKRETE published yields: 80 lb concrete mix ≈ 0.6 cu ft/bag, 60 lb ≈ 0.45 cu ft/bag; 1 cubic yard = 27 cu ft. 2026 cost: ready-mix ~$150–$200/cu yd delivered (HomeAdvisor/Angi "Concrete Delivery Cost", Concrete Network national averages); 80 lb bag ~$5–$8 retail. Typical slab depths 3–6 in (residential code practice).

Disclaimer: This tool is for educational estimation only. Subgrade, forming, finishing, and short-load/delivery fees affect totals. It does not constitute a quote or professional advice.