Almost everyone who’s ever priced out a fence by hand has made the same mistake: dividing the fence length by the post spacing and buying that many posts, only to come up one short at the last stretch. Our fence calculator fixes that for good.
- Correct by construction — posts needed is always gaps + 1, and the page walks through why with a small, concrete example.
- Instant — enter your fence length, post spacing, and rail rows and both the post count and total rail length update as you type.
- Shareable — your exact numbers live in the link, so you can send a materials list to whoever’s picking up the lumber.
- Honest about scope — gate posts and corner posts need their own planning, and the FAQ says so plainly instead of quietly guessing.
Try it with your own fence line, and if you write about outdoor DIY projects, the calculator is embeddable on your own site with one iframe.