Fence Calculator
Estimate fence panels and posts from run length and spacing.
Use decimals when needed. This estimate updates live and is safe to tweak before you buy materials.
Fence Buying Guide
This guide helps you turn your fence calculator result into a cleaner purchase plan. Use it when you want fewer return trips, better waste assumptions, and a more realistic cart.
Step 1: Measure the perimeter
Measure the total linear length of the fence line. Stake out the corners and use a long tape measure, taking care to follow the terrain.
Step 2: Calculate post spacing
Fence posts are typically spaced 6 or 8 feet apart. Divide your total length by the panel width and add one extra post to finish the line.
Step 3: Dig deep for stability
Fence posts must be buried deep (often 1/3 of their length) and set in concrete. You will need 1-2 bags of fast-setting concrete per post hole.
Recommended for this job
Commonly paired tools and accessories
These are the practical extras people often forget until the last minute, especially when turning a rough estimate into a real purchase list.
Post hole diggerWhy this helps: Common add-on that reduces last-minute store runs once the estimate is final.
Fence post levelWhy this helps: Common add-on that reduces last-minute store runs once the estimate is final.
Disclosure: these may be affiliate links.
Fencing cost planning rule of thumb
Your material list includes posts, horizontal rails, vertical pickets, concrete mix, exterior-grade screws or nails, and heavy-duty gate hardware.
Understanding the Math
Formula: The basic formula for Fence Calculator typically involves calculating the total area or volume (Length × Width × Depth) and dividing by the coverage of a single unit or package, then adding a waste factor (usually 10%).
Example: For example, if you have a 10x10 area and your material covers 10 square feet per unit, you need 10 units. With a 10% waste factor, you should purchase 11 units to ensure you don't run short.
Related Calculators
Fence Calculator FAQ
How many posts do I need?
Posts are usually one more than panels for straight runs.
Do gates change this estimate?
Yes. Add gate hardware and adjust panel count around openings.
How deep should fence posts go?
Rule of thumb is to bury at least 1/3 of the post's total length in the ground, usually below the frost line.
Do I need a permit for a fence?
Most municipalities require a permit for fences over 6 feet tall or for fences installed in the front yard. Always check local zoning laws.