Fence Posts – Count, Depth & Concrete Bags

A reliable fence posts takeoff follows one rule: measure twice, order once. The calculator converts your perimeter length and post spacing into dependable quantities using Posts = Perimeter ÷ Spacing + 1 (+ Gates); Bags = Posts × Hole Volume ÷ 0.02 m³/bag, then adds the waste margin that experienced builders apply by default. Example: An 80 m perimeter at 2.4 m: 34 posts, holes 25 × 70 cm → 0.034 m³ each = 1.7 bags - order 60 bags with spare. Field tip: Crown the concrete 5 cm above grade and slope it away - water pooling at the post kills it. The result is broken down into purchasable units - bags, sheets, rolls or truck loads - so you can order the nearest whole unit without overbuying, and every figure traces back to the formula shown above.

1. 1

   Take dimensions

   Note the perimeter length and post spacing for the area you are covering or filling.

2. 2

   Run the calculation

   The calculator applies Posts = Perimeter ÷ Spacing + 1 (+ Gates); Bags = Posts × Hole Volume ÷ 0.02 m³/bag the moment you type.

3. 3

   Check the breakdown

   Compare base quantity and waste-adjusted totals side by side.

4. 4

   Plan the purchase

   Use the final figure to price and schedule the delivery.

• Forgetting hardware and fasteners

• Unequal riser heights

• Building without permits