About this calculator
Enter the total length, post spacing and gate openings.
How to use it
- Enter the fence length and post spacing.
- Enter gate widths.
- Enter rows of wire and extra posts.
The formula
Posts = fence run ÷ spacing + 1 + extra; wire = run × rows × 1.05
- extra posts
- corners and gate posts
- 1.05
- for sag and ties
Worked example
A 200 ft boundary with posts every 8 ft
- Fence run = 190 ft after a 10 ft gate.
- Posts = 29 including 4 corner and gate posts.
- Five rows of wire: about 304 m.
What the result means
Closer spacing makes a stronger fence.
Assumptions
- Straight runs.
Limitations
- Slopes and curves need extra.
Frequently asked questions
How far apart should fence posts be?
Usually 6 to 10 ft.
How much barbed wire is in a roll?
Rolls vary by gauge and weight; check the length on the label.
How many rows of wire?
Commonly 4 to 7.
Last reviewed on 3 October 2026. Found a mistake? Tell us.