Fence Post Calculator to estimate fence posts, post spacing, terminal posts, waste, concrete volume, and preliminary post cost.
Home & Construction Calculators
Plan fence posts from total fence length, spacing, extra corner or gate posts, waste, and concrete requirements.
Add every special post for corners, gates, ends, and changes in direction. Confirm hole diameter, depth, frost line, soil, wind exposure, and local requirements separately.
About the Fence Post Calculator
This fence post calculator estimates line posts, extra corner and gate posts, waste-adjusted purchase quantity, concrete volume, and preliminary material cost.
Formula and assumptions
Line posts = fence length ÷ spacing, rounded up, plus one terminal post. Total base posts add entered corner or gate posts. Waste is applied before purchase quantities are rounded. Concrete weight equals purchase posts × concrete per post.
Worked example
A 100-ft fence with 8-ft spacing needs 14 line and terminal posts. Adding two corner or gate posts gives 16 base posts. With 10% waste, plan for 18 posts. At 80 lb of concrete per post, the concrete estimate is 1,440 lb.
Measurement checklist
- Mark every corner, gate, end, and direction change.
- Check property lines and underground utilities.
- Confirm post spacing matches panel or rail length.
- Verify hole depth, diameter, frost, and soil conditions.
Manual calculation steps
- Divide fence length by spacing.
- Round up and add one terminal post.
- Add special corner and gate posts.
- Apply waste and round the order quantity.
- Multiply posts by concrete per post.
- Add post and concrete costs.
Frequently asked questions
Why is one terminal post added?
A straight fence run normally needs one more post than the number of spaces between posts. Corners and gates need additional posts.
How much concrete does each post need?
It depends on post size, hole diameter, depth, soil, frost, wind, and local practice. Use the entered amount only as a planning allowance.
Does this calculate hole depth?
No. Confirm depth and diameter using the fence design, soil conditions, frost requirements, and local rules.
Common mistakes
- Forgetting gate and corner posts.
- Spacing posts without matching panel lengths.
- Ignoring frost depth and soil stability.
- Digging before locating utilities.