Fencing calculator
Work out how many fence panels and posts you need. Enter the total length of the run and the panel width and this calculator gives you the panels, posts, postmix and gravel boards.
Fencing calculator
Enter your measurements in metres. Everything updates as you type, and nothing is sent anywhere.
Standard fence panels are 1.83m (6ft) wide. You need one more post than panels, since there is a post at each end. Postmix is estimated at about two 20kg bags per post. Gravel boards and post caps are optional, one of each per panel and post.
Common questions
How many fence panels and posts do I need?
Divide the total length of the fence by the panel width, usually 1.83m, and round up for the number of panels. You need one more post than panels, because there is a post at both ends as well as between each panel.
How much postmix do I need per fence post?
About two 20kg bags of postmix per post for a standard 1.8m fence, more for taller or exposed fencing where the posts are set deeper. Set posts at least 600mm into the ground.
These are independent guide prices based on typical UK jobs in 2026. Your actual cost depends on your property, spec, access and where you live. Always get at least three written quotes before committing. These quantities are a guide to help you order. Always round up and check with your supplier before buying.