How Much is Bags of Concrete in Construction?
Concrete is one of the most widely used building materials in construction projects, whether for sidewalks, driveways, patios, foundations, or retaining walls. One of the most common ways it’s sold is in pre-mixed bags, making it convenient for small to medium construction jobs. But if you’re asking, “How much are bags of concrete in construction?”, the answer depends on size, brand, and location.
In this guide, we’ll break down the cost of concrete bags, factors affecting the price, and how much you’ll need for different projects.
Common Sizes of Concrete Bags
Concrete mix is typically sold in 40-lb, 50-lb, 60-lb, and 80-lb bags. Each bag has different coverage, so choosing the right size depends on your project.
| Bag Size | Average Price (USD) | Coverage (Cubic Feet) | Best For |
|---|---|---|---|
| 40 lbs | $3.50 – $5.00 | 0.30 cu. ft. | Small repairs, post setting |
| 50 lbs | $4.00 – $5.50 | 0.37 cu. ft. | Medium DIY tasks |
| 60 lbs | $5.00 – $6.50 | 0.45 cu. ft. | Sidewalks, small slabs |
| 80 lbs | $6.00 – $8.50 | 0.60 cu. ft. | Driveways, patios, large slabs |
Note: Prices vary by location, supplier, and brand.
Factors That Affect the Price of Concrete Bags
- Bag Size – Larger bags cost more but are more economical per cubic foot.
- Brand – Popular brands like Quikrete or Sakrete may cost slightly more due to reliability.
- Location – Prices differ depending on region, transportation, and local demand.
- Special Mixes – Fast-setting, high-strength, or fiber-reinforced concrete bags cost more than standard mixes.
- Bulk Purchases – Buying pallets (usually 40–56 bags) often reduces the cost per bag.
How Many Bags of Concrete Do You Need?
To calculate, you’ll need to know the volume of your project.
Formula:
Length (ft) × Width (ft) × Depth (ft) = Total Cubic Feet Needed
Then divide by the cubic feet coverage of one bag.
Example 1: Small Patio (10 ft × 10 ft × 4 in)
- Volume = 10 × 10 × 0.33 = 33 cubic feet
- Using 60-lb bags (0.45 cu. ft. each):
33 ÷ 0.45 = ~74 bags needed
Example 2: Fence Posts (10 posts, each 1 ft × 1 ft × 2 ft)
- Volume per hole = 2 cubic ft × 10 = 20 cubic feet
- Using 80-lb bags (0.60 cu. ft. each):
20 ÷ 0.60 = ~34 bags needed
Cost Breakdown for Construction Projects
| Project Type | Average Volume (Cubic Ft.) | Bags Needed (80 lbs) | Estimated Cost |
|---|---|---|---|
| Small sidewalk (4×8 ft, 4 in thick) | 11 cu. ft. | 19 bags | $120 – $160 |
| Driveway (12×20 ft, 4 in thick) | 80 cu. ft. | 134 bags | $800 – $1,100 |
| Shed foundation (10×12 ft, 6 in thick) | 60 cu. ft. | 100 bags | $650 – $850 |
| Fence posts (10 posts, 2 cu. ft. each) | 20 cu. ft. | 34 bags | $200 – $300 |
Tips for Buying Concrete Bags
- Buy in bulk for larger projects to save money.
- Check delivery options—large quantities are heavy and may require pallet delivery.
- Choose the right mix (standard, high-strength, or fast-setting) based on your project.
- Avoid waste by calculating volume carefully before purchase.
- Store properly—keep bags dry, as moisture ruins the mix.
Conclusion
The cost of bags of concrete in construction typically ranges from $3.50 to $8.50 per bag, depending on size, brand, and mix type. For small DIY repairs, buying a few bags is affordable and convenient. For large projects like driveways or foundations, purchasing pallets or even ordering ready-mix concrete may be more cost-efficient. By calculating your project volume and comparing bag sizes, you can determine exactly how much concrete you’ll need and how much it will cost.
FAQs
1. How much does a 60-lb bag of concrete cost?
A 60-lb bag usually costs between $5 and $6.50, depending on location and brand.
2. How much concrete does an 80-lb bag make?
An 80-lb bag yields about 0.60 cubic feet of concrete.
3. Is it cheaper to buy bags of concrete or ready-mix?
For small projects, bags are cheaper. For large slabs or driveways, ready-mix concrete delivered by truck is more cost-effective.
4. How many bags of concrete do I need for 1 cubic yard?
One cubic yard = 27 cubic feet.
- Using 80-lb bags: 27 ÷ 0.60 ≈ 45 bags.
5. What type of concrete bag should I use for fence posts?
A fast-setting concrete mix is best for fence posts, as it cures quickly and holds posts firmly.
6. Can I mix multiple bags at once?
Yes, you can mix several bags in a wheelbarrow, mixer, or tub, depending on project size.
7. Do concrete bags expire?
Yes, if stored improperly. Bags should be used within 12 months and kept dry to prevent hardening.
8. Where can I buy bags of concrete for construction?
They are available at home improvement stores (Home Depot, Lowe’s, Ace), construction suppliers, and local hardware stores.
