What size hole for 3×3, 4×4, 5×5, 6×6 and 8×8 fence post | what size hole for 3×3 post | what size hole for 4×4 post | what size hole for 5×5 post | what size hole for 6×6 post | what size hole for 8×8 post.

Fence posts are built up surrounding the property area of land, it is made of iron steel rod or Timber, in those areas wooden Timber is not inexpensive, mostly agriculture land is surrounded by wooden Timber post, this is made for protection of agricultural land, farm house and their property, and some due to privacy reasons.

A boundary gate or side gate or garden gate is usually placed to protect certain to protect or keep kids or pets in, or intruders or animals out, or even just for your privacy. Generally, a side gate or garden gate is about 1800mm (6ft) high.

Fence post/ boundary gate post/ side gate post/ garden gate post are in round, square or rectangular shape made of steel, concrete pole or wooden Timber, but most commonly used is wooden timber fence post.

**Size of posts**:- commonly used size of fence post/ boundary gate post/ side gate post/ garden gate post made of wooden Timber are in square shape of cross sectional dimension of 3″×3″ (75mm × 75mm), 4″×4″ (100mm × 100mm), 5″×5″ (125mm × 125mm), 6″×6″ (150mm × 150mm) and 8″×8″ (200mm × 200mm) having total length about 8 feet, out of 8 feet post length minimum 2 feet buried into the ground and about 6 feet height above the ground level.

**Size of fence post hole**:- for fencing post you should dig out the soil from the ground and make a post hole, regarding this, “what is the size of post hole?”, it’s totally depends on height of fence post above the ground and cross-sectional dimension of fence post, depth of post hole should be 1/3 to 1/2 of fence post height which is exactly above the ground and width of post hole should be 3 times the diameter or width of fence of post.

For example a fence post is 6 feet in height above the ground and their cross sectional dimension is 4″×4″, minimum depth of post hole is 1/3 of 6 ft is equal as 2 feet must be buried into the ground and maximum should be 1/2 of 6 ft is equal as 3 feet and width of post hole is 3 times of 4″, that should be equal as 12″ or 1 feet.

**Thumb rule for size of post hole:**–

● Depth of post hole – depth of the post hole should be 1/3 to 1/2 of height of fence post above ground ((such as the hole for a 6” high wood post should be about 2 feet (24 inches) deep buried in the ground.

● Diameter or width of post hole – diameter of the hole is 3 times the width of the post (such as the hole for a 4” wood post should be about 12 inches wide).

**What size hole for 3×3, 4×4, 5×5, 6×6 and 8×8 fence post**

**What size hole for 3×3 post**:- as per thumb rule and guidelines, for a 4 foot high 3″ × 3″ (75mm × 75mm) size fence post, you will need atleast hole size of 1.5 ft (18″) deep and 1 feet (12″) wide in square shaped. Thus, hole size of 1.5 feet deep and 1 feet in diameter are used for 3″ × 3″ (75mm × 75mm) post used as fence post/ boundary gate post/ side gate post/ garden gate post made of wooden Timber.

**What size hole for 4×4 post**:- as per thumb rule and guidelines, for a 6 foot high 4″ × 4″ (100mm × 100mm) size fence post, you will need atleast hole size of 2 ft (24″) deep and 1 feet (12″) wide in square shaped. Thus, hole size of 2 feet (600mm) deep and 1 feet in diameter are used for 4″ × 4″ (100mm × 100mm) post used as fence post/ boundary gate post/ side gate post/ garden gate post made of wooden Timber.

**What size hole for 5×5 post**:- as per thumb rule and guidelines, for a 6 foot high 5″ × 5″ (125mm × 125mm) size fence post, you will need atleast hole size of 2 ft (24″) deep and 1.25 feet (15″) wide in square shaped. Thus, hole size of 2 feet (600mm) deep and 1.25 feet in diameter are used for 5″ × 5″ (125mm × 125mm) post used as fence post/ boundary gate post/ side gate post/ garden gate post made of wooden Timber.

**What size hole for 6×6 post:**– as per thumb rule and guidelines, for a 6 foot high 6″ × 6″ (150mm × 150mm) size fence post, you will need atleast hole size of 2 ft (24″) deep and 1.5 feet (18″) wide in square shaped. Thus, hole size of 2 feet (600mm) deep and 1.5 feet in diameter are used for 6″ × 6″ (150mm × 150mm) post used as fence post/ boundary gate post/ side gate post/ garden gate post made of wooden Timber.

**What size hole for 8×8 post**:- as per thumb rule and guidelines, for a 8 foot high 8″ × 8″ (200mm × 200mm) size post, you will need atleast hole size of 3 ft (36″) deep and 2 feet (24″) wide in square shaped. Thus, hole size of 3 feet (900mm) deep and 2 feet (600mm) in diameter are used for 8″ × 8″ (200mm × 200mm) post used as fence post/ boundary gate post/ side gate post/ garden gate post made of wooden Timber.

**How big should a hole be for a post**:- in general, holes should be at least 3 feet long and 2 feet wide for posts that extend 8 feet or more above ground level. Posts that extend 6 feet above ground level should have holes at least 2 1/2 feet long and 2 feet in diameter. Posts that extend 4ft to 5 feet above ground level should have holes at least 2 feet long and 1 feet wide.

**How big of a hole do i need for a 8×8 post**:- as per general thumb rule and guidelines, for a 8×8 post you will need holes should be at least 3 feet long and 2 feet wide for posts that extend 8 feet or more above ground level.

**How big of a hole do i need for a 6×6 post**:- as per general thumb rule and guidelines, for a 6×6 post you will need holes should be at least 2.5 feet long and 1.5 feet wide for posts that extend 6 feet above ground level.

**How big of a hole do i need for a 5×5 post**:- as per general thumb rule and guidelines, for a 5×5 post you will need holes should be at least 2 feet long and 1.25 feet wide for posts that extend 6 feet above ground level.

**How big of a hole do i need for a 4×4 post**:- as per general thumb rule and guidelines, for a 4×4 post you will need holes should be at least 2 feet long and 1 feet wide for posts that extend 6 feet above ground level.

**How big of a hole do i need for a 3×3 post**:- as per general thumb rule and guidelines, for a 3×3 post you will need holes should be at least 1.5 feet long and 1 feet wide for posts that extend 4 feet above ground level.

**How deep should a post be in the ground:**– in general, a post 6×6 or 8×8 that extend 8 feet or more above ground level should be at least 3 feet deep buried in the ground. Posts that extend 6 feet above ground level should have holes at least 2 1/2 feet deep. Posts that extend 4ft to 5 feet above ground level should have holes at least 2 feet deep.

**How to you calculate concrete for fence posts**

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**How many cubic feet in a 42.5 kg bag of cement**

**What size concrete tube for 4×4 post**

What size concrete tube do i need for a 4″x4” post? The rule-of-thumb is to use a tube diameter 2 times the post width, therefore use a 8” diameter concrete tube (Sonotube, Quick tube, or SAKRETE tube) for a 4×4 fence, deck or pergola post. Thus, 8″ diameter of concrete tube is an ideal size for 4×4 post.

**What size concrete tube for 4×6 post**

What size concrete tube do i need for a 4″x6” post? The rule-of-thumb is to use a tube diameter 2 times the post width, therefore use a 10” diameter concrete tube (Sonotube, Quick tube, or SAKRETE tube) for a 4×6 fence, deck or pergola post. Thus, 10″ diameter of concrete tube is an ideal size for 4×6 post.

**What size concrete tube for 6×6 post**

What size concrete tube do i need for a 6″x6” post? The rule-of-thumb is to use a tube diameter 2 times the post width, therefore use a 12” diameter concrete tube (Sonotube, Quick tube, or SAKRETE tube) for a 6×6 fence, deck or pergola post. Thus, 12″ diameter of concrete tube is an ideal size for 6×6 post.

**Conclusion**:-

For a 6 foot high 4″×4″ (100mm × 100mm) size fence post, you will need atleast hole size of 2 ft (24″) deep and 1 feet (12″) wide in square shaped.