Sakrete Concrete Calculator
This Sakrete concrete calculator tells you how many bags of Sakrete to buy for a slab, footing or pad. Enter the length, width and thickness, pick the Sakrete mix you're using, and it gives you the bag count for 40, 60 and 80 lb bags with 10 percent added for waste. You also get the total in cubic yards and the weight, so you can tell whether bags still make sense or it's time to call for ready-mix.
Sakrete bags per yard and coverage
| Mix | Bag | Yield | Covers at 4 in | Bags per yd |
|---|---|---|---|---|
| High-Strength | 40 lb | 0.30 ft³ | 0.9 sq ft | 90 |
| High-Strength | 60 lb | 0.45 ft³ | 1.35 sq ft | 60 |
| High-Strength | 80 lb | 0.60 ft³ | 1.8 sq ft | 45 |
| High-Strength | 90 lb | 0.66 ft³ | 2.0 sq ft | 41 |
| Maximizer | 40 lb | 0.46 ft³ | 1.4 sq ft | 59 |
| Maximizer | 80 lb | 0.92 ft³ | 2.75 sq ft | 30 |
| 5000 Plus | 50 lb | 0.38 ft³ | 1.1 sq ft | 72 |
| Fast-Setting | 50 lb | 0.38 ft³ | 1.1 sq ft | 72 |
Yields are from Sakrete's High-Strength and Maximizer data sheets and its product pages. The 60 and 80 lb bags of 5000 Plus yield the same as High-Strength. If you're buying Maximizer, pick it in the calculator. Its lightweight aggregate gives about 53 percent more concrete per bag, so estimating it like a regular bag means buying a third too many. The coverage column assumes 4 inches. If you already know the area, convert square feet to concrete at any thickness. Using another brand? Here are the bags per cubic yard for every brand.
How the calculator works
- Enter the length, width and thickness of the pour.
- Pick the Sakrete mix you're buying, or leave it on generic bags.
- Keep the 10 percent waste allowance. Sakrete's own estimating guide says to add it.
Bags = length × width × thickness (ft³) ÷ bag yield (ft³), rounded up
Example: a 10 × 10 ft slab, 4 inches thick
10 × 10 × 0.333 = 33.3 cubic feet, or 1.23 cubic yards. Add 10 percent and you need 36.7 cubic feet, which is:
- 62 bags of 80 lb High-Strength
- 40 bags of 80 lb Maximizer
- 82 bags of 60 lb or 123 bags of 40 lb High-Strength
Sixty-two 80 lb bags is almost 5,000 lb to carry and mix, and the finished slab weighs about the same (see how much concrete weighs for any pour). Somewhere past a cubic yard, a ready-mix truck usually wins, and the concrete cost calculator compares the two. Our breakdown of what ready-mix costs by the yard shows what the truck will charge, fees included. Sakrete calls for at least 4 inches on flatwork; see slab thickness for when to go thicker.
Which Sakrete mix should you buy?
High-Strength
45 bags
per cubic yard, 80 lb
- Strength
- 4,000 psi
- Foot traffic
- 24 hr
- Vehicles
- 72 hr
- Best for
- Slabs, footings, general work
Maximizer
30 bags
per cubic yard, 80 lb
- Strength
- 5,500 psi
- Foot traffic
- 24 hr
- Vehicles
- 48 hr
- Best for
- Fewer bags to haul by hand
Fast-Setting
30 min
to set, 50 lb bag
- Strength
- 4,000 psi
- Foot traffic
- 6 hr
- Vehicles
- 48 hr
- Best for
- Fence and mailbox posts, no mixing
5000 Plus
12 hr
to foot traffic
- Strength
- 5,000 psi
- Vehicles
- 72 hr
- Bags
- 50, 60 and 80 lb
- Best for
- Repairs you need back fast
Figures are from the High-Strength, Maximizer, Fast-Setting and 5000 Plus product pages and data sheets. For posts, the fence post concrete calculator handles the hole size. Building a block wall? Count the blocks first, then the mortar calculator sizes the mortar. For walls, round columns or stairs, try our free concrete volume calculator. Every Sakrete mix is covered in the Sakrete mix types guide.
Sakrete vs Quikrete bag counts
For standard bags they're the same: both yield 0.60 cubic feet per 80 lb bag, so 45 bags make a yard either way. The difference is Maximizer, which has no Quikrete equivalent on store shelves. Buy whichever your store stocks and use the matching tool, this one or the Quikrete calculator. The full comparison is in Sakrete vs Quikrete. If your store only carries Quikrete, the types of Quikrete guide shows which bag matches each Sakrete mix.
Frequently asked questions
How many bags of Sakrete make a yard?
45 bags of 80 lb High-Strength, 60 bags of 60 lb or 90 bags of 40 lb. The 90 lb bag takes 41, and 80 lb Maximizer takes only 30 because each bag yields 0.92 cubic feet instead of 0.60.
How much does an 80 lb bag of Sakrete cover?
An 80 lb bag of High-Strength yields 0.60 cubic feet, which covers about 1.8 square feet at 4 inches deep or 3.6 square feet at 2 inches. An 80 lb bag of Maximizer covers about 2.75 square feet at 4 inches.
How many bags of Sakrete for a 10x10 slab?
A 10 by 10 foot slab at 4 inches thick is 33.3 cubic feet. With 10 percent extra that is 62 bags of 80 lb High-Strength, 40 bags of 80 lb Maximizer, or 82 bags of 60 lb.
How much Sakrete do I need for a post?
A 10 inch wide, 2 foot deep hole holds about 1.1 cubic feet before you subtract the post, so plan on 2 bags of 80 lb or 3 bags of 50 lb Fast-Setting. The fence post concrete calculator works it out for your hole and post size.
Is Sakrete or Quikrete better?
For bag counts they are the same: both standard mixes yield 0.60 cubic feet per 80 lb bag. Sakrete also sells Maximizer, the high-yield bag. Buy whichever your store stocks and check the yield on the bag.
Is this an official Sakrete tool?
No. This is a free, independent calculator and is not affiliated with or endorsed by Sakrete. Sakrete is a trademark of its owner; always verify the yield printed on the bag.