Sakrete Concrete Calculator
Bag counts for SAKRETE® High-Strength, 5000 Plus, Fast Setting, Crack Resistant and Maximizer using the yield printed on each product's technical data sheet.
Quick answer
A 10×10 ft slab at 4 in needs 56 × 80 lb Sakrete High-Strength bags (33.33 ft³ ÷ 0.6 ft³ per bag, rounded up) — 59 bags with 5% waste. The same pour is 75 × 60 lb bags, 88 × 50 lb Fast Setting bags, or 37 × 80 lb Maximizer bags. Yields come from Sakrete technical data sheets fetched 2026-10-17; the bag math is our own concrete bag formula.
Result
| Volume | |
| Bags (exact) |
Official Sakrete yields we use
| Product | Bag | Published yield | Source |
|---|---|---|---|
| High-Strength Concrete Mix (4,000 psi) | 40 lb | 0.30 ft³ | Sakrete-High-Strength-Concrete-Mix-TDS.pdf (Jan 2024) |
| High-Strength Concrete Mix | 60 lb | 0.45 ft³ | same |
| High-Strength Concrete Mix | 80 lb | 0.6 ft³ | same |
| High-Strength Concrete Mix | 90 lb | 0.66 ft³ | same |
| 5000 Plus Concrete Mix | 50 lb | 0.38 ft³ | Sakrete-5000-Plus-TDS.pdf |
| 5000 Plus Concrete Mix | 60 lb | 0.47 ft³ | same (the product web page shows 0.45 ft³; we use the data sheet) |
| 5000 Plus Concrete Mix | 80 lb | 0.6 ft³ | same |
| Fast Setting Concrete Mix | 50 lb | 0.38 ft³ | Fast-Setting-Concrete.pdf |
| Crack Resistant Concrete Mix | 50 lb | 0.38 ft³ | Sakrete-Crack-Resistant-Concrete-TDS.pdf |
| Crack Resistant Concrete Mix | 80 lb | 0.6 ft³ | same |
| Maximizer Concrete Mix (lightweight) | 40 lb | 0.46 ft³ | Sakrete-Maximizer-Concrete-Mix-TDS (rev. 04-24) |
| Maximizer Concrete Mix (lightweight) | 80 lb | 0.92 ft³ | same |
Sakrete's sheets describe these yields as approximate and not including waste or spillage. Always check the yield printed on your bag. We do not list retail prices on this page.
Computed bag chart: common slabs (0% waste)
| Slab | ft³ | HS 40 lb | HS 60 lb | HS / 5000 Plus / Crack Res. 80 lb | HS 90 lb | 50 lb (Fast Setting, 5000 Plus, Crack Res.) | Maximizer 80 lb |
|---|---|---|---|---|---|---|---|
| 3×3 × 4 in | 3.00 | 10 | 7 | 5 | 5 | 8 | 4 |
| 4×4 × 4 in | 5.33 | 18 | 12 | 9 | 9 | 15 | 6 |
| 10×10 × 4 in | 33.33 | 112 | 75 | 56 | 51 | 88 | 37 |
| 10×12 × 4 in | 40.00 | 134 | 89 | 67 | 61 | 106 | 44 |
| 12×12 × 4 in | 48.00 | 160 | 107 | 80 | 73 | 127 | 53 |
| 10×10 × 6 in | 50.00 | 167 | 112 | 84 | 76 | 132 | 55 |
| 20×20 × 4 in | 133.33 | 445 | 297 | 223 | 203 | 351 | 145 |
5000 Plus 60 lb (0.47 ft³) takes 71 bags for the 10×10×4 in slab and 103 for 12×12×4 in. Maximizer 40 lb (0.46 ft³) takes 73 and 105.
Bags per cubic yard and coverage per bag (computed)
| Bag | Yield | Bags per yd³ | ft² per bag at 4 in | ft² per bag at 2 in |
|---|---|---|---|---|
| High-Strength 40 lb | 0.30 ft³ | 90.00 | 0.90 | 1.80 |
| High-Strength 60 lb | 0.45 ft³ | 60.00 | 1.35 | 2.70 |
| 80 lb (High-Strength, 5000 Plus, Crack Resistant) | 0.6 ft³ | 45.00 | 1.80 | 3.60 |
| High-Strength 90 lb | 0.66 ft³ | 40.91 | 1.98 | 3.96 |
| 50 lb (Fast Setting, 5000 Plus, Crack Resistant) | 0.38 ft³ | 71.05 | 1.14 | 2.28 |
| 5000 Plus 60 lb | 0.47 ft³ | 57.45 | 1.41 | 2.82 |
| Maximizer 40 lb | 0.46 ft³ | 58.70 | 1.38 | 2.76 |
| Maximizer 80 lb | 0.92 ft³ | 29.35 | 2.76 | 5.52 |
Fence posts: Sakrete's chart vs our cylinder math
| Hole depth | Hole volume | Bags, empty hole | Bags, minus 4×4 post | Sakrete chart |
|---|---|---|---|---|
| 12 in | 0.545 ft³ | 1.44 | 1.21 | 1.25 |
| 18 in | 0.818 ft³ | 2.15 | 1.82 | 2 |
| 24 in | 1.091 ft³ | 2.87 | 2.42 | 2.5 |
| 30 in | 1.364 ft³ | 3.59 | 3.03 | 3 |
Our post-subtracted figures sit within 0.2 bag of Sakrete's chart, which suggests the chart assumes a post in the hole (the sheet does not say which size). For an empty sonotube-style hole, use the larger column. More hole sizes are on our fence post concrete guide.
Worked example: 12×12 patio, three Sakrete options
Job: 12 ft × 12 ft patio, 4 in thick, 5% waste.
- Volume: 12 × 12 × (4 ÷ 12) = 48.00 ft³ (1.78 yd³)
- High-Strength 80 lb: 48 ÷ 0.6 × 1.05 = 84.0 → 84 bags
- High-Strength 60 lb: 48 ÷ 0.45 × 1.05 = 112.0 → 112 bags
- Maximizer 80 lb: 48 ÷ 0.92 × 1.05 = 54.8 → 55 bags
At almost 1.8 yd³ this pour is past the point where hand-mixing bags is practical for most people — get a ready-mix quote too. Same footprint with Quikrete yields: see the Quikrete concrete calculator.
Formula
Bags = Volume(ft³) ÷ Sakrete yield × (1 + waste%) — always rounded up
This is the same method Sakrete prints on its data sheets (length × width × thickness ÷ 12, then divide by the yield). It uses the same geometry as our concrete bag calculator; the difference is that the yield menu is locked to Sakrete-published numbers.
Limitations
- Rectangular area of uniform depth only. For round piers or post holes, get the volume from the column calculator and divide by your bag's yield.
- Yields are approximate per Sakrete and exclude waste and spillage; uneven subgrade can add more.
- Sakrete recommends its concrete mixes for applications 2 in thick and over; thinner toppings need a different product.
FAQ
How many 80 lb Sakrete bags for a 10x10 slab 4 inches thick?
Volume is 10 × 10 × (4 ÷ 12) = 33.33 ft³. Sakrete High-Strength Concrete Mix lists 0.6 ft³ per 80 lb bag, so 33.33 ÷ 0.6 = 55.56 → 56 bags before waste, 59 bags with 5% waste.
How many Sakrete bags make a cubic yard?
One cubic yard is 27 ft³. At the published yields: 45 × 80 lb High-Strength bags (0.6 ft³), 60 × 60 lb (0.45 ft³), 90 × 40 lb (0.30 ft³), about 41 × 90 lb (0.66 ft³), about 72 × 50 lb Fast Setting or Crack Resistant bags (0.38 ft³) and about 30 × 80 lb Maximizer bags (0.92 ft³). Round up when you buy.
How many bags of Sakrete Fast Setting per fence post?
Sakrete's Fast Setting data sheet lists 1.25 bags (50 lb) for a 10 in diameter hole 12 in deep, 2 bags at 18 in, 2.5 bags at 24 in and 3 bags at 30 in. Our own cylinder math lands within 0.2 bag of those figures once a 4×4 post is subtracted.
Why does Sakrete Maximizer need fewer bags?
Maximizer is a lightweight-aggregate mix. Its data sheet lists 0.92 ft³ per 80 lb bag versus 0.6 ft³ for High-Strength, so the same 10×10×4 in slab takes 37 Maximizer bags instead of 56 before waste.
Is the Sakrete calculator the same as the Quikrete calculator?
The geometry is the same; only the yield per bag changes. At 80 lb both brands publish 0.6 ft³. At 90 lb Sakrete lists 0.66 ft³ and Quikrete 0.675 ft³, so a 10×10×4 in slab is 51 Sakrete bags versus 50 Quikrete bags.
Last updated: October 17, 2026. SAKRETE® is a registered trademark of SAKRETE of North America LLC; TrueToolCalc is not affiliated with Sakrete.