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How many interlocking deck tiles and boxes for a patio, balcony or old deck, with the cost.
With these inputs:
| Result | Value |
|---|---|
| Deck tiles | 126 tiles · 13 boxes |
| Area | 120 sq ft |
| Layout | 10 × 12 tiles |
| Coverage bought | 130 sq ft |
| Edge to trim or finish | 44 ft |
| Tile cost | $388.70 |
| Grid | ceil(10 × 12 ÷ 12) × ceil(12 × 12 ÷ 12) = 120 |
| With extra | ceil(120 × 1.05) = 126 |
| Boxes | ceil(126 ÷ 10) = 13 |
Defaults follow BuildDirect's JF Outdoor composite interlocking tile: 12 × 12 in, 10 tiles a box (10 sq ft), listed at $2.99/sq ft on 1 Oct 2026. Home Depot's Pro Space acacia tile is the same 12 in, 10-pack format. Tiles float on a flat, hard, drained surface — they don't bridge joists, so over an old deck the boards must be sound and flat.
Interlocking deck tiles snap together on a flat, hard surface — a concrete patio, a balcony slab, a roof membrane or a sound old deck — with no fasteners. Enter the area's length and width, the tile size and how many tiles come in a box. The calculator lays out the grid, counts full and cut tiles, adds a small allowance for breakage and pattern changes, and turns it into boxes and a price.
Divide the length and the width by the tile size, round each up, and multiply. A 10 × 12 ft patio with 12 in tiles is 10 × 12 = 120 tiles. Add about 5% for breakage and pattern changes — 126 tiles, or 13 boxes of 10.
Usually 10 tiles of 12 × 12 in, covering 10 sq ft — that is how BuildDirect's JF Outdoor composite tiles and Home Depot's Pro Space acacia tiles are packed. Check the box: some brands pack 6, 11 or 44.
Not directly. Interlocking tiles are made to float on a flat, hard surface such as concrete, stone, pavers or a waterproof membrane. On soil they rock and sink; lay a compacted gravel or paver base first.
Yes, if the deck boards are sound, flat and fastened down — the tiles add little stiffness and won't fix soft boards or a bouncy frame. Lay them across the boards and keep the gaps between deck boards open for drainage.
BuildDirect listed JF Outdoor composite tiles at $2.99 per sq ft on 1 October 2026, so 130 sq ft (13 boxes) for a 10 × 12 ft patio is $388.70. Enter the price per sq ft of the tile you choose — wood and stone-look tiles cost more.
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