Owen PalmerBy Owen Palmer

Updated November 2026

Buying laminate flooring by the box is simpler than it sounds once you know how to measure the room and account for waste. This guide walks you through working out how many boxes you need, what to check before you pay, and how to avoid running short halfway through the job. By the end, you will have a clear count and a plan for the materials that go with it.

Measure the Room and Count the Boxes

Start by measuring the length and width of each room in feet, then multiply them to get square footage. Round up to the nearest half foot for each measurement. Add the square footage of every room that will get the same floor, plus a closet or hallway if the planks will run through.

Shopping for one? See our guide: 7 Best Laminate Flooring Installation Tools for DIY Renovators (2026).

Next, check the coverage printed on the box. Manufacturers list the square feet each box covers, and that number varies by brand and plank size. Divide your total square footage by the box coverage and round up to a whole box.

Add Waste for Cuts and Layout

Laminate loses material at walls, doorways and corners, so you need extra planks. A simple rule is to add 10 percent for a straight layout and 15 percent for a diagonal layout or a room with many angles. Larger rooms with a single run of planks need less waste than small, busy spaces.

Keep the offcuts from the first row. They often work as the starting piece for the next row, which recovers some of that waste.

Check Batch Numbers and Finish Before You Buy

Color and finish can vary between production runs. Look at the batch or lot number printed on the box, and try to buy every box you need from the same batch. If you cannot get them all at once, lay out planks from different boxes side by side before you start, and mix them across the room.

Confirm that the product matches your existing floors or trim if you are blending rooms. A sample board helps more than a photo on a screen, since lighting changes how the finish reads.

Prepare the Subfloor and Materials

Before the first plank goes down, the subfloor should be flat, clean and dry. Check for high spots with a straightedge and sand or grind them down. Most manufacturers specify a maximum deviation over a set length, so check the installation guide that came with your product.

Plan to buy the underlayment and transition pieces at the same time as the flooring. Running short on trim after the planks are down means waiting and possibly mismatched finishes.

Items to gather before you start:

  • Tape measure, pencil and a carpenter’s square
  • Tapping block and pull bar for tight joints
  • Spacers for the expansion gap at the walls
  • Underlayment, transition strips and quarter-round molding
  • Miter saw or jigsaw for cuts

Quick Reference: Waste Allowance by Room Layout

Room layout Suggested extra planks
Simple rectangle, straight layout About 10 percent
Diagonal layout or many corners About 15 percent
Rooms with stairs or built-ins About 15 to 20 percent
  • A tapping block and pull bar set helps you seat the joints tightly without damaging the edges. View on Amazon
  • Spacers hold the expansion gap at the walls so the floor can move with humidity. View on Amazon
  • A miter saw makes straight, clean cuts at doorways and along trim. View on Amazon

Common mistakes

  • Ordering exact square footage with no waste, which often leaves you short on the last row.
  • Mixing batch numbers without checking, leading to visible color shifts.
  • Skipping the expansion gap at walls and fixed objects.
  • Installing over an uneven subfloor and assuming the planks will hide it.
  • Forgetting transition strips at doorways between rooms with different floors.

For more on preparing the floor beneath, see Underpad for Laminate Flooring: A Step-by-Step Guide for Beginners and Vapor Barrier for Laminate Flooring: A Step-by-Step Guide for Beginners. If you are unsure about moisture levels in a concrete slab, a flooring professional can test them before you commit to a product.

FAQ

How much extra laminate should I buy?

Plan for about 10 percent extra for a simple, straight layout and about 15 percent for diagonal or complex rooms. Keep a few spare planks after the job for future repairs.

Can I return unopened boxes if I have leftovers?

Many retailers accept unopened boxes, but policies differ, and some limit returns on flooring. Check the store’s return terms before you buy, and keep your receipt and the original packaging.

Do I need to buy all the boxes from one batch?

Yes, when possible. Matching batch numbers reduces visible color and finish differences across the floor.

Conclusion

Measure each room, add the right amount of waste for the layout, and check batch numbers before you buy. Do that and you will have enough material to finish the job without a second trip to the store. Take your time with the subfloor, since a flat base makes the rest of the install much easier.

Ready to choose one?

Owen Palmer

About Owen Palmer

Owen Palmer is part of our editorial team and reviews and edits our DIY home renovation guides, checking product details against manufacturer specifications and owner feedback.