How Many Bags of Concrete in a Yard? (40, 50, 60 & 80 lb Tables)
Exact mathematical calculation and reference tables for how many bags of pre-mix concrete equal one cubic yard (27 cu ft) across all standard retail bag sizes.
Direct Answer
It takes exactly 45 bags of 80-pound concrete, 60 bags of 60-pound concrete, 72 bags of 50-pound concrete, or 90 bags of 40-pound concrete to equal one cubic yard of placed concrete. One cubic yard contains 27 cubic feet. When ordering, always add a 10% safety margin for uneven grade and spillage.
| Bag Weight | Yield per Bag (cu ft) | Yield per Bag (cu yd) | Bags per 1 Cu Yd | Bags with 10% Overage | Total Weight (lbs) |
|---|---|---|---|---|---|
| 80 lb (36.3 kg) | 0.60 cu ft | 0.0222 cu yd | 45 bags | 50 bags | 3,600 lbs |
| 60 lb (27.2 kg) | 0.45 cu ft | 0.0167 cu yd | 60 bags | 66 bags | 3,600 lbs |
| 50 lb (22.7 kg) | 0.375 cu ft | 0.0139 cu yd | 72 bags | 80 bags | 3,600 lbs |
| 40 lb (18.1 kg) | 0.30 cu ft | 0.0111 cu yd | 90 bags | 99 bags | 3,600 lbs |
How to Calculate Bags of Concrete
Packaged premix dry concrete consists of Portland cement, graded sand, and coarse gravel. Once mixed with water, consolidated, and cured, its dry in-place density averages 133 to 138 pounds per cubic foot. Because one cubic yard measures 3 feet by 3 feet by 3 feet, its total volume is 27 cubic feet. Dividing 27 cubic feet by the volume yield of an individual bag determines the exact bag count.
Total Cubic Feet = Length (ft) × Width (ft) × (Thickness (in) ÷ 12)
Cubic Yards = Total Cubic Feet ÷ 27
80 lb Bags Needed = Cubic Yards × 45 × 1.10 (Waste Margin)
60 lb Bags Needed = Cubic Yards × 60 × 1.10 (Waste Margin)
For example, calculating a concrete sidewalk section measuring 20 feet long, 4 feet wide, and 4 inches thick:
- Compute cubic feet: 20 × 4 × (4 ÷ 12) = 26.67 cubic feet.
- Convert to cubic yards: 26.67 ÷ 27 = 0.988 cubic yards.
- Multiply by 80-pound yield rate: 0.988 × 45 = 44.4 bags.
- Add 10% contingency allowance: 44.4 × 1.10 = 48.9 (round up to 49 bags).
Concrete Bag Cost Breakdown by Region
Buying pre-mixed bags is cost-effective for pours under 2 cubic yards. Once job volume exceeds 2 to 3 cubic yards, delivery by transit mix truck generally becomes faster and less labor-intensive. Here is the retail material pricing breakdown across regional construction markets:
| Region | 80 lb Bag Price | 60 lb Bag Price | Bag Cost per Cu Yd (80 lb) | Ready-Mix Truck per Cu Yd | Short-Load Truck Fee |
|---|---|---|---|---|---|
| US National Average | $5.50 – $6.80 | $4.40 – $5.40 | $248 – $306 | $145 – $175 | $90 – $150 |
| Northeast US | $6.20 – $7.40 | $4.90 – $5.90 | $279 – $333 | $160 – $195 | $110 – $170 |
| Southeast US | $5.10 – $6.20 | $4.10 – $4.90 | $230 – $279 | $135 – $165 | $85 – $130 |
| Midwest US | $5.30 – $6.40 | $4.20 – $5.10 | $238 – $288 | $140 – $170 | $90 – $140 |
| Western US / Pacific | $6.50 – $7.80 | $5.20 – $6.20 | $292 – $351 | $165 – $205 | $120 – $185 |
Transportation and Pallet Weight Logistics
One cubic yard of concrete weighs approximately 3,600 to 4,000 pounds when mixed. A standard wooden pallet holds 42 bags of 80-pound concrete (3,360 pounds) or 56 bags of 60-pound concrete (3,360 pounds).
A standard half-ton pickup truck (such as an F-150 or Silverado 1500) has a maximum bed payload between 1,600 and 2,200 pounds. Attempting to haul a full cubic yard (45 eighty-pound bags) in a single half-ton truck load will overload rear springs and axles. Moving one cubic yard requires either two pickup trips, a heavy-duty three-quarter-ton truck, or paying flatbed delivery fees from the supplier.
Labor and Mixing Time Realities
Hand-mixing concrete in a plastic wheelbarrow or mortar tub takes between 4 and 6 minutes per 80-pound bag, including opening, adding measured clean water, hoeing, placing, and wheeling. Mixing 45 bags by hand represents 3 to 4.5 hours of continuous physical labor before finishing starts.
If your pour requires more than 20 bags (approx. 0.45 cubic yards), rent an electric or gas barrel mixer from a tool yard. A portable 3.5 cubic foot mixer handles two 60-pound or 80-pound bags per batch, producing uniform consistency without exhausting your crew.
Common Concrete Bag Mistakes
Mistake 1: Ignoring Subgrade Inaccuracies and Grade Deflection
Dirt is never laser-flat. If your excavated grade averages 4.5 inches deep instead of the designed 4.0 inches across a 10×10 slab, you need an extra 12.5% of concrete volume. Always order a minimum 10% overage for slabs on ground and 15% for bell-bottom pier footings.
Mistake 2: Adding Excessive Water to Improve Workability
Adding extra water makes hand-hoeing bags easier, but dilute cement paste destroys compressive strength. Exceeding recommended water (typically 3.0 to 3.5 quarts per 80-pound bag) causes surface dusting, extensive shrinkage cracks, and lowered freeze-thaw durability.
Mistake 3: Creating Cold Joints from Slow Mixing
If mixing takes too long between batches, previously poured concrete reaches initial set before the next bag is deposited. This creates an unbonded structural cold joint where water can penetrate and freeze, causing spalling and cracking.
Frequently Asked Questions
How many 80 lb bags of concrete do I need for a 10x10 slab at 4 inches?
A 10×10 foot slab poured 4 inches thick contains 33.33 cubic feet (1.23 cubic yards). You need 56 bags of 80-pound concrete without waste, or 62 bags with a recommended 10% waste buffer.
Is it cheaper to buy bags or order a concrete truck?
For jobs smaller than 2 cubic yards (under 90 eighty-pound bags), buying bags is typically cheaper because ready-mix suppliers charge short-load delivery penalties ranging from $90 to $170 for orders under 5 cubic yards. For pours over 3 cubic yards, delivery trucks are both cheaper and significantly faster.
How much water does an 80 lb bag of concrete take?
A standard 80-pound bag of high-strength concrete requires approximately 3 to 3.5 quarts (2.8 to 3.3 liters) of clean water. Add 90% of the water first, blend thoroughly, then add the remaining liquid in small increments until the mortar forms a workable oatmeal-like slump.
How long does bagged concrete take to cure before walking on it?
Bagged concrete reaches initial set in 4 to 6 hours and can support light foot traffic after 24 to 48 hours. Full structural design strength (typically 3,500 to 4,000 PSI) is attained after 28 days of proper moist curing.
Can I mix 60 lb and 80 lb bags together in the same pour?
Yes, as long as both products have matching compressive strength ratings (such as standard 3,500 or 4,000 PSI concrete mix). Do not mix rapid-setting concrete formulations with standard cement mix in the same batch.
Next Steps
- Calculate exact materials with the Concrete Slab Calculator
- Check bag counts with the Cement Bags Calculator
- Review complete transit mix pricing in the Concrete Cost Per Yard Guide