Fence Post Hole Concrete Bag Calculator (4x4 & 6x6 Posts)
Estimate fast-setting concrete bags per hole for 4x4 and 6x6 fence posts.
Interactive Material & Cost Estimator
HomeYardMath.com — Hardware Store Shopping List
Estimated Material Needed 1 sq ft @ 30" depth (+5% buffer)
Bulk Volume (Cubic Yards) 0.10 2.6 cubic feet
Estimated Total Weight 0.19 US Tons (389 lbs)
Store Bag Count 8 50 lb bags
Pallet Estimate (56 bags) ~0.14 pallets
Estimated Project Material Cost Bulk Saves $34
Retail Package Total $47.84 Before local sales tax
Bulk + Truck Delivery $14.10 Includes $0 delivery
Quick Reference Coverage Chart (Concrete & Masonry)
Instant pre-calculated material estimates for common US residential project sizes before compaction buffer:
| Typical US Project | Area | Depth | Volume | Weight | Store Bags |
|---|---|---|---|---|---|
| Standard 4x4 Post (10" Hole × 30" Deep) | 10" Hole × 30" | 30 inches | 1.2 cu ft | 100 lbs | 3 bags (50 lb fast-setting) |
Engineering Formula & Material Density Constant
Hole Volume Minus Wooden Post = Net Concrete Volume
Subtracts the displacement volume of a 4x4 or 6x6 wooden post from the cylindrical augered hole volume.
Fast-Setting Concrete vs Standard Mix
Fast-setting concrete (Quikrete 50) sets in 20 to 40 minutes without mixing in a wheelbarrow; you simply pour dry mix into the hole and add water.
Frequently Asked Questions
How many bags of concrete per fence post hole?
Typically two to three 50 lb bags for a standard 10-inch diameter, 30-inch deep hole.
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