Quikrete Post Hole Calculator

Updated 2026-05-16

Estimate Quikrete-style concrete bags first from project area, thickness, bag yield, and waste, then verify the exact product label before buying. This calculator is independent and is not affiliated with or endorsed by Quikrete. Use the exact product label or technical data sheet for yield, water amount, working time, coverage, and intended-use limits before buying.

Quick estimate: 0.96 cubic yards for 10 cylinders at 12 in diameter, 3 ft high, with 10% waste.

Quikrete product label check

This calculator is independent and is not affiliated with or endorsed by Quikrete. Use the exact product label or technical data sheet for yield, water amount, working time, coverage, and intended-use limits before buying.

How to use this Quikrete calculator

Use this page as a neutral bagged-concrete planner for Quikrete-style products. Enter the project area, thickness, waste, and the yield printed on the bag you plan to buy. The calculator is not affiliated with or endorsed by Quikrete.

Use the bag label as the source of truth

Bag yield can vary by product line, bag size, mix type, moisture, and how the material is mixed. The default yield is only a planning assumption, so update it when the product label shows a different cubic-foot yield.

Bagged mix vs ready-mix

Bagged concrete can be practical for small slabs, pads, repairs, post holes, and short pours. For larger projects, compare the bag count with ready-mix delivery, labor, supplier minimums, and how long the pour will take.

Concrete bag planning table

Uses common planning yields: 0.60 cu ft per 80 lb bag and 0.45 cu ft per 60 lb bag. Verify the product label.

Concrete volumeCubic feet80 lb bags60 lb bags
0.25 cu yd6.75 cu ft12 bags15 bags
0.50 cu yd13.5 cu ft23 bags30 bags
1.00 cu yd27 cu ft45 bags60 bags
2.00 cu yd54 cu ft90 bags120 bags

Before you calculate

  • Count only the holes that will receive concrete.
  • Measure hole diameter in inches and hole depth in feet before calculating bag count.
  • Use the yield printed on the concrete bag, because bag sizes and mixes can vary.

Common mistakes

  • Using post size instead of actual hole diameter.
  • Forgetting corner, gate, brace, or terminal posts.
  • Ignoring loose soil or over-dug holes that increase concrete volume.

Formula

cubic yards = count * pi * (diameter / 24)^2 * height / 27 * (1 + wastePercent / 100)

Assumptions

  • Diameter is entered in inches.
  • Depth is entered as height in feet.
  • This calculator is not affiliated with or endorsed by any brand.

Example

Estimated concrete needed: 0.96 cubic yards

How to use this round concrete calculator

  1. Count the matching tubes, piers, columns, or round forms in the project.
  2. Enter the inside diameter in inches, then enter the concrete-filled height or depth in feet.
  3. Use separate estimates when round forms have different diameters or depths.
  4. Review cubic feet, cubic yards, 60 lb bags, and 80 lb bags before comparing bagged concrete with ready-mix.
  5. Confirm form bracing, frost depth, reinforcement, and inspection requirements outside the calculator.

Before you buy materials

  • Round bag quantities up, because partial bags are rarely useful for final ordering.
  • Check fence layout and local frost-depth guidance before setting final hole depth.

FAQ

What is the example quikrete post hole cubic-yard result?

Use diameter or radius, height or depth, count, and waste, then calculate the planning result. In the default example, the result is 0.96 cubic yards.

Is this affiliated with Quikrete?

No. This is an independent planning calculator and is not affiliated with, sponsored by, or endorsed by Quikrete. Always follow the product label and manufacturer instructions.

How do I estimate Quikrete bags for a slab or pad?

Calculate total cubic feet from area and thickness, add waste, divide by the bag yield printed on the product label, then round up to whole bags.

What yield should I enter for quikrete bags?

Enter the cubic-foot yield shown on the exact bag you plan to buy. Common planning examples are often around 0.60 cubic feet for many 80 lb bags and 0.45 cubic feet for many 60 lb bags, but product labels vary.

Should I buy extra quikrete bags?

A small waste buffer is usually useful for uneven base, over-digging, mixing loss, and final top-off. The right buffer depends on the project and product.

When should I use ready-mix instead of quikrete bags?

For larger volumes, compare total bag count, mixing labor, placement time, delivery availability, and supplier minimums. The calculator estimates quantity only.

Is this Quikrete calculator official?

This calculator is independent and is not affiliated with or endorsed by Quikrete. Use the exact product label or technical data sheet for yield, water amount, working time, coverage, and intended-use limits before buying.

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This calculator is for planning estimates only. Verify final quantities with product labels, project conditions, and a qualified professional when accuracy matters.