Laminate Flooring Calculator

Square Metres Don't Tell You How Many Packs to Buy

Here's what every other laminate calculator does: it takes your room length, multiplies by your room width, adds a percentage for waste, and gives you a number in square metres. You then go to the shop, look at the coverage per pack printed on the box, divide, round up, and hope you got it right.

The problem is that the waste percentage is a guess. The standard advice is "add 10 percent," but your actual waste depends on things a square metre calculation can't see. It depends on your plank dimensions, because a 1,380mm (54 3/8") plank creates different offcuts than a 1,200mm (47 1/4") plank in the same room. It depends on your room shape, because an L-shaped hallway produces more edge waste than a rectangular bedroom. And it depends on your stagger pattern, because the offset between rows determines which offcuts are reusable and which are scrap.

Laminate is sold in packs of 6, 8, or 10 planks depending on the brand. Each pack covers a specific number of square metres, but you don't install square metres. You install planks. If your layout needs 67 planks and the pack has 8, you need 9 packs. The square metre calculation might suggest 8 packs are enough, or it might suggest you need 10. Either way, it's an approximation when it doesn't have to be. You can get an exact number. You just need a calculator that lays the planks instead of multiplying the area.

How Herron Calculates Laminate Properly

Herron doesn't estimate. It lays every plank into your room, row by row, exactly the way you'd install them on the floor. You draw your room shape as a polygon, enter your plank dimensions and pack size, and the engine builds the full layout.

Row 1 gets full planks across, with a cut piece at the end to fit the wall. The offcut from that cut becomes the starter for Row 2 if it meets the minimum stagger length. If it doesn't, the engine starts a fresh plank and records the short offcut as waste. This cascades through every row, with each stagger determined by the actual offcut from the row above, not an arbitrary percentage.

The result is a complete picture. You see which rows use offcuts as starters and which need fresh planks. You see the stagger pattern across the entire floor and whether it looks natural or falls into a repeating step. You see the first and last row widths, so you can catch the classic problem of a 30mm sliver against the far wall before you've opened a single pack. And you get a pack count that reflects the planks your layout actually consumes, not a square metre approximation rounded to the nearest whole number.

This is not more complicated. It takes five to ten minutes. But those minutes give you a number you can trust instead of a number you have to hope is close enough.

What You Get

Exact pack counts, not square metre estimates. Herron counts the planks your layout needs, divides by your pack size, and rounds up. The number accounts for stagger waste, edge cuts, and offcut reuse. It's the number you take to the till. No mental arithmetic in the aisle, no second-guessing, no emergency return trip because you're two planks short on the last row.

Stagger verification you can see. The layout shows the offset pattern across your entire floor. You see immediately whether it looks natural or whether the joints align in distracting patterns. If the stagger doesn't look right, adjust the starting offset and the layout recalculates in seconds. Try that on the actual floor and you're pulling up rows.

First and last row width check. This is the single most common laminate installation mistake. If the last row ends up as a narrow sliver, it's nearly impossible to install cleanly and looks wrong. Herron shows you the first and last row widths before you start. If either is too narrow, you split the difference, trim the first row slightly, and the last row comes out at a sensible width. One check, ten seconds, problem avoided.

A plank-by-plank cut list. Every row listed in sequence. Full planks, cut pieces with exact lengths, offcut starters with their dimensions. Print it, take it to the room, and work through it row by row. No measuring on the fly. No losing track of which offcut belongs where. No accidentally cutting two planks to the same wrong length because you mixed up the rows.

Real waste calculation from your room geometry. Not 10 percent. Not 5 percent. The actual waste your room shape and plank size produce, calculated from every cut in the layout. A 3.5 metre by 4 metre rectangular bedroom with 1,380mm planks might waste 4 percent. An L-shaped hallway with the same planks might waste 9 percent. Herron tells you which one you're looking at, so your budget reflects reality.

Frequently Asked Questions