How this calculator works
Edge restraint goes round every free edge of a paved area. You count the sections by dividing the length of the edge by the length of a section, with a little extra for cuts, rounded up. The spikes go through the holes in the edging into the base at the spacing you choose, so there is one for every spacing along the length, plus one at the end.
Worked example: 80 ft of edge with 10 ft sections is 9 sections with 5% extra, 81 spikes at 12 in, and 8 connectors. At an 8 in spacing the spikes go up to 121, and with 20 ft sections the count falls to 5.
Assumptions and sources
- Assumptions used: 5% waste added; spikes every 12 in plus one at the end; one connector per joint.
- Edge restraint is what keeps pavers from spreading under traffic and holds the bedding sand in. The Interlocking Concrete Pavement Institute asks for it on every free edge of segmental paving. Plastic and metal edging is anchored with long spikes through the holes, driven into the compacted base outside the paving, and the spacing in the maker's instructions rules. Driveways take much more load than patios, so use the closer spacing, or a concrete edge restraint. Spikes are sold in lengths from about 8 to 12 inches.
The formula and a worked example are shown above, so you can check any result by hand. Read how we calculate and check our numbers. Results are estimates for planning: supplier products vary, so check the size printed on the label.
Edging and spikes for common jobs
10 ft sections, spikes every 12 in, 5% extra.
| Job | Edge length | Sections | Spikes |
|---|---|---|---|
| 10 × 10 ft patio, all four sides | 40 ft | 5 | 41 |
| 12 × 16 ft patio, one side against the house | 44 ft | 5 | 45 |
| 16 × 20 ft patio, three free sides | 56 ft | 6 | 57 |
| Walkway 3 × 30 ft, both sides | 60 ft | 7 | 61 |
| Driveway 12 × 40 ft, both long sides | 80 ft | 9 | 81 |
Tips before you buy
- Install the edging after the base is compacted and before the sand and pavers, and set it so that the top is level with the paver surface.
- Anchor the edging on the outside, in the compacted base, not in the loose sand, and backfill and compact soil against the outside.
- For curves, cut the vertical ribs in the plastic or score the metal. Tight curves need a spike more often.
- Edge a driveway more strongly than a patio: a concrete edge restraint or a heavy-duty edging with closer spikes holds better under cars.
- Do not edge the sides of the paving that butt a wall or a building. They are already restrained.
Tools & materials for this project
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Frequently asked questions
How much edging do I need for a paver patio?
Measure every edge that is not against a wall or step. 80 ft of edge takes 9 sections of 10 ft with 5% extra.
How far apart do I put the spikes in paver edging?
Follow the maker's instructions. Spikes every 12 inches is a good standard, 18 inches can do for a patio, and a driveway needs them closer, because it takes much more load.
Do I need edging on all sides of a paver patio?
On every free edge, yes. The edges against a wall, a house or a step are already held, but a free edge without restraint lets the pavers spread and the sand escape.
What can I use as paver edging?
Plastic or aluminum edge restraint spiked into the base, or a concrete edge poured or set against the pavers. Plastic and aluminum suit patios and paths, and concrete suits driveways.
How long are sections of paver edging?
Commonly 8 ft, 10 ft or 20 ft. Longer sections mean fewer joints but are harder to curve neatly.
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Estimates only. Results assume standard materials and simple shapes. Supplier products vary, and the final call on quantity, structure and safety is yours. Check your local code and your supplier's guidance before ordering.