Post Hole Concrete Calculator
Post hole concrete calculator: enter hole size, post size and number of posts to get bags of 40, 50, 60 or 80 lb mix, cubic yards and cost.
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How the Post Hole Concrete Calculator Formula Works
Each post sits in a round hole. The concrete that fills the hole is the volume of the hole minus the volume of the post standing in it. The calculator takes the concrete height as the hole depth less the gap you leave at the top and any gravel you put in the bottom.
Multiply the concrete per hole by the number of posts and by 1 plus your waste allowance. Divide by the yield printed on the bag (0.30, 0.375, 0.45 and 0.60 cubic feet for 40, 50, 60 and 80 lb bags) and round up to whole bags.
The post area is the width squared for a square post and pi x (width / 2)2 for a round one. Everything is worked in inches, then cubic inches are divided by 1,728 to give cubic feet, and cubic feet are divided by 27 to give cubic yards.
concrete per hole = pi × (hole diameter / 2)2 × height − post area × height- hole diameterinWidth of the round hole. The QUIKRETE data sheet says 3 times the post width.
- heightinConcrete height: hole depth minus the top gap minus any gravel base.
- post areasq inWidth squared for a square post, pi x (width / 2)^2 for a round post.
- yieldcu ftVolume one bag makes, from the bag label.
- hole diameter
- in
- Width of the round hole. The QUIKRETE data sheet says 3 times the post width.
- height
- in
- Concrete height: hole depth minus the top gap minus any gravel base.
- post area
- sq in
- Width squared for a square post, pi x (width / 2)^2 for a round post.
- yield
- cu ft
- Volume one bag makes, from the bag label.
Using the Post Hole Concrete Calculator
Enter units
Choose from Inches, Centimetres.
Enter post shape
Choose from Square (4x4, 6x6), Round.
Enter post width (inches or cm)
Type the figure you already have, then press Calculate.
Enter hole diameter (inches or cm)
Type the figure you already have, then press Calculate.
Enter hole depth (inches or cm)
Type the figure you already have, then press Calculate.
Enter gap left at the top (inches or cm)
Type the figure you already have, then press Calculate.
Enter gravel base under the post (inches or cm)
Type the figure you already have, then press Calculate.
Enter number of posts
Type the figure you already have, then press Calculate.
Enter waste allowance (%)
Type the figure you already have, then press Calculate.
Enter bag size
Choose from 40 lb bag, 50 lb bag, 60 lb bag, 80 lb bag.
Enter yield per bag in cubic feet (0 = use label default)
Type the figure you already have, then press Calculate.
Enter price per bag (placeholder, enter yours)
Type the figure you already have, then press Calculate.
Read the result
Press Calculate to update the result. Until you do, the last result is dimmed and marked as out of date, so you always know which numbers belong to the values in the boxes.
A Real Worked Example
A fence run uses ten 4x4 posts (3.5 inches actual) in 12 inch holes, 30 inches deep, with 3 inches left at the top for soil. The concrete height is 30 − 3 = 27 inches. The hole holds 1.767 cubic feet and the post takes up 0.191, so each hole needs 1.576 cubic feet.
Ten holes need 15.76 cubic feet. With 10 percent waste the order is 17.33 cubic feet, or 0.642 cubic yards. A 50 lb bag yields 0.375 cubic feet, so 17.33 / 0.375 = 46.22, which rounds up to 47 bags. That is 4.62 bags per post, and at a placeholder $6.50 a bag the cost is $305.50.
Round 4 inch post in a 10 inch hole, 2 feet deep
The QUIKRETE data sheet says two 50 lb bags set a 4 inch post in a 10 inch hole 2 feet deep. Entering a round 4 inch post, a 10 inch hole, 24 inches deep, 3 inches at the top and no waste gives a concrete height of 21 inches. The hole holds 0.954 cubic feet, the post 0.153, leaving 0.802 cubic feet.
That is 2.14 bags of 50 lb mix, which rounds up to 3. The label's two bags is an approximate figure for a typical case, so the calculator tells you to buy one more to be safe.
Four 6x6 gate and corner posts, 80 lb bags
Four 6x6 posts (5.5 inches actual) go in 18 inch holes, 42 inches deep, with a 3 inch top gap, so the concrete is 39 inches high. One hole holds 5.743 cubic feet, the post takes 0.683, and the concrete is 5.060 cubic feet.
Four posts need 20.24 cubic feet, or 22.27 with 10 percent waste (0.825 cubic yards). An 80 lb bag yields 0.60 cubic feet, so that is 37.11 bags, rounded up to 38. The 80 lb mix weighs 3,040 lb in total, so plan how to carry it.
Metric: eight 10 cm posts in 30 cm holes
With units set to centimetres, eight 10 cm square posts go in 30 cm holes, 75 cm deep with 8 cm left at the top. The calculator converts to inches (1 inch = 2.54 cm), so the concrete height is 67 cm, about 26.38 inches. One hole needs 1.436 cubic feet.
Eight holes with 10 percent waste come to 12.64 cubic feet, which is 0.358 cubic metres. In 60 lb bags (0.45 cubic feet each) that is 28.08, rounded up to 29 bags.
Gravel base under six posts, 40 lb bags
Six 4x4 posts go in 12 inch holes, 36 inches deep, on a 6 inch gravel base with 3 inches left at the top. The concrete is 36 − 3 − 6 = 27 inches high, the same as the first example, so each hole needs 1.576 cubic feet.
Six holes with 10 percent waste need 10.40 cubic feet. A 40 lb bag yields 0.30 cubic feet, so that is 34.67 bags, rounded up to 35. The gravel does the filling at the bottom, so the deeper hole costs no extra concrete.
A long run: 24 posts in 10 inch holes
A long fence uses 24 4x4 posts in 10 inch holes, 24 inches deep, with 80 lb bags. The concrete is 21 inches high. One hole needs 0.806 cubic feet, so 24 holes need 19.33 cubic feet and 21.27 with 10 percent waste, which is 0.788 cubic yards.
In 80 lb bags that is 35.45 bags, rounded up to 36. At 0.79 cubic yards you could also price delivered ready-mix, but most suppliers have a minimum load, so bags are likely cheaper at this size.
What Else to Know
How much concrete does one post hole need?
A post hole is a cylinder, and the post standing in it takes up part of that space. The concrete is the hole volume minus the post volume. The volume of a cylinder is pi times the radius squared times the height, as set out in any geometry reference such as the [Wikipedia article on the cylinder](https://en.wikipedia.org/wiki/Cylinder).
Take a 4x4 post, which measures 3.5 inches square in reality, in a 12 inch hole. If the concrete is 27 inches high, the hole holds 1.767 cubic feet and the post occupies 0.191 cubic feet. One hole needs 1.576 cubic feet of concrete. People often guess too high because they forget the post itself, or too low because they forget the bottom of the post sits in concrete too.
The calculator asks for the gap you leave at the top, because most guides stop the concrete a few inches below ground so soil or sod can cover it. The QUIKRETE data sheet for setting posts says to pour the mix until it is about 3 to 4 inches from the top of the hole, and the default gap of 3 inches follows that figure.
Fence post concrete calculator: how many bags for a 4x4 post?
For the default 4x4 in a 12 inch hole 30 inches deep, one post needs 1.58 cubic feet. A 50 lb bag yields 0.375 cubic feet, so that is 4.20 bags and 5 when you round up. A tighter 10 inch hole needs only 2.8 bags, because volume grows with the square of the diameter.
The hole size matters more than most people expect. Going from a 10 inch to a 14 inch hole around the same post roughly doubles the concrete. The QUIKRETE Fast-Setting Concrete data sheet gives a size to aim for: the hole diameter should be 3 times the post diameter, so about 10.5 inches for a 4x4 and about 16.5 inches for a 6x6. The table below shows the concrete for each size.
Remember that the real size of a 4x4 is 3.5 inches. If you enter 4 the calculator slightly overstates the post, which lowers the answer a little. Measure your own posts if you can.
Bags of 40, 50, 60 and 80 lb: pick the yield from your bag
The number of bags depends on the bag size, because a bigger bag makes more concrete. The QUIKRETE Concrete Mix No. 1101 data sheet lists 0.30 cubic feet for a 40 lb bag, 0.375 for 50 lb, 0.45 for 60 lb and 0.60 for 80 lb. The calculator uses those as defaults and shows all four bag counts so you can compare at the store.
For the default job, the order is 17.33 cubic feet, which is 58 bags of 40 lb, 47 of 50 lb, 39 of 60 lb or 29 of 80 lb. Smaller bags are easier to carry and cost more per cubic foot at most stores, so compare the price per cubic foot of mix, not per bag.
Brands differ. If your bag prints a different yield, type it into the yield box in cubic feet and the calculator will use it. Fast-setting, high-strength and other special mixes can have their own yield, so always check the label. A cubic yard is 27 cubic feet, so one yard is 72 bags of 50 lb mix.
How deep should a post hole be with concrete?
The same QUIKRETE data sheet says the depth of the post hole should be one half of the above-ground post height. A 6 foot fence panel therefore calls for a hole about 36 inches deep, and a 4 foot fence about 24 inches. Half the height above ground is the same as one third of the whole post length, which is the common one third rule of thumb. This is a rule of thumb, not a code requirement.
Depth also depends on frost. The [frost line](https://en.wikipedia.org/wiki/Frost_line) is the depth to which groundwater in soil is expected to freeze, and building codes take it into account because frost heaving moves foundations. Penn State Extension notes that some soils heave with frost and loosen posts that are not set deep enough, that sandy or wet soils call for deeper settings, and that a typical line post depth is 36 inches with corner and gate posts often 48 inches. Your local frost depth and code override any of these rules.
The table below shows concrete per post for common fence heights using the half-height depth and a 10.5 inch hole.
Dry pour, mixing on site and what the label allows
Some mixes are made for posts and can be poured dry. The QUIKRETE Fast-Setting Concrete data sheet describes setting the post, pouring the dry mix until it is about 3 to 4 inches from the top, then soaking it with water. It says this takes about 1 gallon of water per 50 lb bag, and that holes deeper than 2 feet 6 inches should be filled in lifts of 2 feet 6 inches or less so the water can soak through. The mix sets in 20 to 40 minutes and the sheet says to wait 4 hours before putting heavy objects on it.
That method belongs to that product. A standard concrete mix is normally mixed with water in a wheelbarrow or mixer first, and pouring it dry into a deep hole can leave dry pockets. Check your bag before choosing the dry pour method, and do not assume it applies to every brand.
The calculator gives you the same bag count either way, because the dry mix volume and the mixed volume are the same to a close estimate. What changes is the effort and the risk of a weak result, so follow the manufacturer's directions.
Metric sizes, 25 kg bags and cubic metres
Switch the units to centimetres to enter post width, hole diameter, depth and gaps in centimetres. The calculator converts to inches using the exact 1 inch = 2.54 centimetres, then reports cubic metres as well as cubic feet and yards. One cubic foot is 0.02832 cubic metres, so the default job of 17.33 cubic feet is 0.491 cubic metres or 491 litres.
Bag sizes are listed in pounds because the label yields used here come from QUIKRETE sheets. For a 25 kg bag, read the yield on your bag. If it is printed in litres, multiply by 0.0353147 to get cubic feet and type that into the yield box. For example, the QUIKRETE sheet gives 0.375 cubic feet (10.6 litres) for a 50 lb bag, so a 12 litre bag is about 0.424 cubic feet.
To convert your own volume to cubic metres by hand, work in metres: diameter 0.3 m and height 0.67 m give pi x 0.152 × 0.67 = 0.0474 cubic metres for the hole, before taking the post away.
Waste, cost and what to read next
Add 5 to 10 percent for waste. Holes are never perfectly round, soil crumbles, and some mix is left in the mixing tub. Ten percent added 4 bags to the default job. Leftover bags keep if stored dry, and running out in the middle of a pour is a mess.
The cost output multiplies the bag count by the price you enter. The default price is a placeholder, not a quote, so replace it with the price at your store. For 47 bags, every dollar on the bag price is 47 dollars on the job.
If you put gravel under the posts or want a drainage layer, work out the stone with the gravel calculator. For a decorative bed around posts, the stone calculator and the river rock calculator cover the cover material by area and depth.
This tool gives an estimate. Follow your local building code and the manufacturer's directions on the bag, and for posts that carry decks, gates or structures, have a professional or your building inspector confirm the size and depth.
Reference Tables
| Hole diameter | 24 in deep | 30 in deep | 36 in deep | 42 in deep | 48 in deep |
|---|---|---|---|---|---|
| 8 in | 0.46 | 0.59 | 0.73 | 0.86 | 0.99 |
| 10 in | 0.81 | 1.04 | 1.27 | 1.50 | 1.73 |
| 12 in | 1.23 | 1.58 | 1.93 | 2.28 | 2.63 |
| 14 in | 1.72 | 2.21 | 2.71 | 3.20 | 3.69 |
| 16 in | 2.29 | 2.95 | 3.61 | 4.26 | 4.92 |
| 18 in | 2.94 | 3.78 | 4.63 | 5.47 | 6.31 |
| Bag size | Yield per bag (cu ft) | Bags per hole (exact) | Bags per hole (rounded up) |
|---|---|---|---|
| 40 lb | 0.300 | 5.25 | 6 |
| 50 lb | 0.375 | 4.20 | 5 |
| 60 lb | 0.450 | 3.50 | 4 |
| 80 lb | 0.600 | 2.63 | 3 |
| Posts | Concrete (cu ft) | Concrete (cu yd) | 50 lb bags | Mix weight (lb) |
|---|---|---|---|---|
| 1 | 1.73 | 0.064 | 5 | 250 |
| 4 | 6.93 | 0.257 | 19 | 950 |
| 10 | 17.33 | 0.642 | 47 | 2,350 |
| 20 | 34.67 | 1.284 | 93 | 4,650 |
| 30 | 52.00 | 1.926 | 139 | 6,950 |
| 50 | 86.67 | 3.210 | 232 | 11,600 |
| 100 | 173.33 | 6.420 | 463 | 23,150 |
| Post (actual width) | Hole diameter (in) | Hole depth (in) | Concrete per hole (cu ft) | 50 lb bags per hole |
|---|---|---|---|---|
| 4x4 (3.5 in) | 10.5 | 36 | 1.42 | 3.79 |
| 6x6 (5.5 in) | 16.5 | 36 | 3.51 | 9.35 |
| 8x8 (7.25 in) | 21.8 | 36 | 6.09 | 16.24 |
| Fence height above ground | Hole depth (in) | Concrete (cu ft) | 50 lb bags (exact) | 50 lb bags (rounded up) |
|---|---|---|---|---|
| 3 ft | 18 | 0.65 | 1.72 | 2 |
| 4 ft | 24 | 0.90 | 2.41 | 3 |
| 5 ft | 30 | 1.16 | 3.10 | 4 |
| 6 ft | 36 | 1.42 | 3.79 | 4 |
| 8 ft | 48 | 1.94 | 5.16 | 6 |
| Bag size | Yield (cu ft) | Bags per cubic foot | Bags per cubic yard | Bags for 10 cu ft |
|---|---|---|---|---|
| 40 lb | 0.300 | 3.33 | 90.0 | 34 |
| 50 lb | 0.375 | 2.67 | 72.0 | 27 |
| 60 lb | 0.450 | 2.22 | 60.0 | 23 |
| 80 lb | 0.600 | 1.67 | 45.0 | 17 |
| Case (round 4 in post, 10 in hole, 24 in deep) | Concrete (cu ft) | 50 lb bags (exact) | Bags rounded up |
|---|---|---|---|
| Concrete to the very top of the hole | 0.916 | 2.44 | 3 |
| Concrete stops 3 in below the top (calculator default) | 0.802 | 2.14 | 3 |
| Two bags as printed on the data sheet | 0.750 | 2.00 | 2 |
| Cubic feet | Cubic yards | Cubic metres | Litres |
|---|---|---|---|
| 1.0 | 0.037 | 0.028 | 28 |
| 5.0 | 0.185 | 0.142 | 142 |
| 10.0 | 0.370 | 0.283 | 283 |
| 13.5 | 0.500 | 0.382 | 382 |
| 27.0 | 1.000 | 0.765 | 765 |
| 54.0 | 2.000 | 1.529 | 1,529 |
| Waste | Concrete to order (cu ft) | 50 lb bags | Extra bags against 0 percent |
|---|---|---|---|
| 0 % | 15.76 | 43 | 0 |
| 5 % | 16.55 | 45 | 2 |
| 10 % | 17.33 | 47 | 4 |
| 15 % | 18.12 | 49 | 6 |
| 20 % | 18.91 | 51 | 8 |
| Price per bag | Bags | Total cost | Cost per post |
|---|---|---|---|
| $5.50 | 47 | $258.50 | $25.85 |
| $6.50 | 47 | $305.50 | $30.55 |
| $7.50 | 47 | $352.50 | $35.25 |
| $9.00 | 47 | $423.00 | $42.30 |
| Gravel base | Concrete height (in) | Concrete (cu ft) | 50 lb bags (exact) |
|---|---|---|---|
| 0 in | 33 | 1.93 | 5.14 |
| 3 in | 30 | 1.75 | 4.67 |
| 4 in | 29 | 1.69 | 4.51 |
| 6 in | 27 | 1.58 | 4.20 |
| 8 in | 25 | 1.46 | 3.89 |
Frequently Asked Questions About the Post Hole Concrete Calculator
How do I calculate how much concrete I need for a hole?
Find the volume of the round hole, subtract the volume of the post standing in it, and divide by the bag yield. For a 12 inch hole with 27 inches of concrete around a 3.5 inch square post, that is 1.767 cubic feet for the hole minus 0.191 for the post, or 1.576 cubic feet. The calculator does this for every post and adds your waste allowance.
What is the 421 rule for concrete?
The 4-2-1 mix is a quick site recipe quoted as 4 parts gravel, 2 parts sand and 1 part cement by volume. It is a rough guide only, and strength depends on water, the materials and curing. For fence posts most people skip it and use bagged mix, which is already blended and has a printed yield. This calculator works from bag yields on the label, so you do not need the ratio.
How many yards is a 40x60 concrete slab?
A 40 by 60 foot slab 4 inches thick holds 29.63 cubic yards, because 40 × 60 × (4 / 12) is 800 cubic feet and 800 divided by 27 is 29.63. At 6 inches thick it is 44.44 cubic yards. This page is for post holes, so for a slab use a slab-style volume calculation and add a waste allowance of 5 to 10 percent.
How much cement do I need to set a post?
You set a post with bagged concrete mix, not plain cement. A 4x4 post in a 12 inch hole 30 inches deep needs 1.58 cubic feet, which is 4.2 bags of 50 lb mix before rounding up, so about 5 bags. Pure cement powder would be mixed with sand and gravel on site, which takes more work and gives a less predictable result.
How much concrete should I use for a fence post?
Use enough to fill the space between the post and the hole walls, from the bottom of the post up to about 3 to 4 inches below the top of the hole. A 4x4 in a 12 inch hole 30 inches deep takes 1.58 cubic feet, roughly 4.2 bags of 50 lb mix. Corner and gate posts sit in bigger holes, so give them more.
How many 50 lb bags of concrete for a 4x4 post?
For a 4x4 post (3.5 inches actual) in a 12 inch hole 30 inches deep with a 3 inch top gap, one hole takes 1.58 cubic feet. A 50 lb bag yields 0.375 cubic feet, so that is 4.20 bags, or 5 bags per post. In a tighter 10 inch hole the same post needs about 2.8 bags.
How deep should a 6 foot fence post be with concrete?
A 6 foot fence usually means about 6 feet above ground, so the rule of one half of the above-ground height gives a hole about 36 inches deep. That is the QUIKRETE data sheet rule for setting posts. In cold climates the hole may need to reach below the local frost depth, and corner and gate posts go deeper. Treat 36 inches as a starting point and check your local code.
What post and hole size suit a 6 ft fence?
Many 6 foot privacy fences use 4x4 posts (3.5 inches actual) about 8 feet long, with 6x6 posts for gates and corners. The hole diameter should be 3 times the post width, so about 10.5 inches for a 4x4 and 16.5 inches for a 6x6. Check what your fence kit or plans call for, since gate loads and local wind can change the post size.
What is the fence post concrete calculator formula?
For each post, concrete = pi x (hole diameter / 2)2 x concrete height minus post width squared x concrete height for a square post. Multiply by the number of posts and by 1 plus the waste percentage, then divide by the bag yield and round up. Concrete height is the hole depth less the top gap and any gravel base. Use inches throughout, then divide cubic inches by 1,728 to get cubic feet.
How do I calculate concrete volume in cubic metres?
Work in metres: volume = pi x (diameter / 2)2 x height for the hole, minus the post. With centimetres, divide by 1,000,000 to get cubic metres. One cubic foot is 0.02832 cubic metres, so 17.33 cubic feet is 0.491 cubic metres. Switch the units to metric and the calculator shows cubic metres for you.
How many 25 kg bags of concrete do I need?
A 25 kg bag does not have one standard yield, so read the yield on your bag. Many labels give litres per bag. Convert litres to cubic feet by multiplying by 0.0353147, type that number into the bag yield box, and the calculator counts bags of that size. For example 12 litres is 0.424 cubic feet. Without a label figure, use the 50 lb (22.7 kg) bag as the closest match.
How much is a yard of concrete?
A cubic yard is 27 cubic feet, which is about 0.765 cubic metres. In 50 lb bags that is 72 bags, in 80 lb bags 45 bags. Price changes by area and supplier, so type your own price per bag into the calculator. For one yard or more, delivered ready-mix is often easier than bags, and the order form asks for cubic yards.
How do I calculate concrete yards needed for post holes?
Add up the concrete in every hole in cubic feet, then divide by 27. Ten 4x4 posts in 12 inch holes 30 inches deep need 15.76 cubic feet, or 0.584 cubic yards. With 10 percent waste the order is 0.642 cubic yards. That is a small amount, so bags are usually easier than a truck.
Can I mix concrete on site for fence posts?
Yes. Fast-setting mixes can be poured dry and soaked, and standard mixes are mixed in a wheelbarrow or mixer first. Mixing on site means more labour and more chance of a weak or wet batch. For 47 bags of mix a small mixer saves effort. Follow the water amount on the label, because too much water weakens the concrete.
Can I pour dry concrete mix straight into a post hole?
Only with a product that says so. The QUIKRETE Fast-Setting Concrete data sheet describes pouring the dry mix into the hole around the post and soaking it with about 1 gallon of water per 50 lb bag, in lifts of 2 feet 6 inches or less for deep holes. Standard mixes are not given that way. Read your bag, and do not use the dry pour method where the label does not allow it.
How wide should a post hole be?
The QUIKRETE data sheet says the hole diameter should be 3 times the post diameter. For a 4x4 post (3.5 inches actual) that is about 10.5 inches, and for a 6x6 (5.5 inches) about 16.5 inches. A wider hole uses much more concrete, because volume grows with the square of the diameter, so do not dig wider than you need.
Should I add gravel in the bottom of the hole?
Gravel under the post is a common practice for drainage, but it is not a code rule and advice varies by soil. In clay it can hold water. If you add a base, enter its depth, because the concrete then starts higher. A 6 inch base in a 36 inch hole cuts the concrete from 1.93 to 1.58 cubic feet per hole.
How much waste should I allow for post holes?
Allow 5 to 10 percent for uneven hole walls, spilled mix and holes dug a little wide. If the soil is loose or the holes are hand dug and ragged, go to 15 percent. For the 10 post job above, 10 percent adds 4 bags compared with no waste. Leftover bags are better than running short in the middle of a pour.
Does the calculator work for round posts and metric sizes?
Yes. Choose round or square for the post, and switch units to centimetres for the post, hole diameter, depth and gaps. The calculator converts to inches internally using 1 inch = 2.54 centimetres. The metric example on this page, eight 10 cm posts in 30 cm holes, comes to 0.358 cubic metres and 29 bags of 60 lb mix.
Why does my answer differ from the bag label?
Labels give an approximate yield and a typical case. The QUIKRETE sheet says two 50 lb bags set a 4 inch post in a 10 inch hole 2 feet deep, while the exact volume with a 3 inch top gap is 2.14 bags, and 2.44 to the very top. The calculator rounds up to whole bags, so it can land one bag higher than the label. Extra is safer.
Do I need concrete for every fence post?
No. Some fences use compacted gravel or tamped soil around the post, and some posts are driven or use ground anchors. Concrete holds a post firmly, which helps for gates, corners and tall solid fences, but it can trap water against wood. Many installers keep concrete a few inches below grade and slope the top away from the post. Follow your plans and local code.
References
- [1] The QUIKRETE Companies. “QUIKRETE Fast-Setting Concrete #1004-50 (SPEC-DATA): yield, hole size and dry-pour instructions for setting posts.” QUIKRETE. Accessed 2026-10-07.
- [2] The QUIKRETE Companies. “Concrete Mix, Product No. 1101: product data sheet (bag sizes, yields and unit weight).” QUIKRETE. Accessed 2026-10-07.
- [3] Penn State Extension. “Fence Planning for Horses (post depth, frost heave, wet soils).” Penn State Extension. Accessed 2026-10-07.
- [4] Wikipedia contributors. “Frost line.” Wikipedia. Accessed 2026-10-07.
- [5] Wikipedia contributors. “Cylinder (geometry): volume formula.” Wikipedia. Accessed 2026-10-07.
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