Deck tile calculator.

The example is a 126 × 120-inch rectangle with a 12-inch square installed module and no setbacks. Ten complete columns cover 120 inches. A remaining six-inch strip needs ten more source tiles: 110 tiles, including ten cuts. Their combined cut-off area is five square feet.

Choose whole modules instead and the footprint becomes 120 × 120 inches: 100 tiles covering 100 square feet. Five square feet remain uncovered. Centering that footprint divides the six-inch remainder into three inches at either side; it does not add material.

Three different kinds of extra material

With cutting enabled, the sample five-percent reserve rounds up to six tiles. The requirement is then 116. Ten tiles per box means 12 boxes containing 120 tiles, with four more from carton rounding. The six reserves, four packaging extras and five square feet of cut-offs are separate quantities.

Setbacks and leftovers have different origins

Suppose the outside rectangle is 132 inches square. Enter two inches on the left, four on the right, three at the top and nine at the bottom. The usable field becomes 126 × 120 inches, exactly the first example. Those intentionally exaggerated clearances illustrate the arithmetic; they are not recommended installation gaps.

Cutting fills that field while leaving the four specified setbacks. Whole modules leave another six inches across its width. With centering enabled, the final distances from the outer boundary become five inches on the left, seven on the right, three at the top and nine at the bottom. The model adds the leftover to the setback rather than replacing the setback with it.

Turn a rectangle before committing to cuts

A small 30 × 36-inch test area illustrates orientation using a 12 × 24-inch module. Without cuts, the original orientation fits two modules; rotating them fits three. That is four versus six square feet of coverage inside the same seven-and-a-half-square-foot boundary. With cutting allowed, either orientation uses six source tiles.

Use the comparison buttons to make that choice explicit. A lower purchase count can simply mean less of the area is tiled. Inspect uncovered area alongside boxes, especially when the remaining strip is beside a door or a walking route.

Read the underside before the saw line

The NewTechWood installation guide advises checking the screws beneath a proposed cut and preserving connections at finished edges. This planner cannot see those details. It lists geometrically fitting rectangles without promising reusable offcuts or a valid interlock after trimming.

Measure the installed repeat

Connected tiles advance by their installed module size. Decorative slats, tabs and the visible face can have different dimensions. For a package-based estimate, consult the exact product information; IKEA’s measuring guide also distinguishes the measured area from the packs required for its shape.

Need conventional ceramic tile with grout spacing? Open the general tile planner. For an upright surface with openings, use the wall opening planner.

• Rectangular areas and modules only. Columns, drains, notches, rounded boundaries and changes in level need their own measured details.
• No engineered support, pedestal spacing, roof loading, water-flow or substrate assessment.
• Cut pieces consume individual source tiles. Kerf, screw locations, slat patterns and interlock compatibility are not modeled.
• No universal waste percentage, expansion clearance or connector multiplier. Setbacks and reserve are supplied by you.
• Price covers tile boxes only. Matching ramps, fascia, corners, delivery, tax and labor are excluded.