How to Cut Mattress Foam

Intermediate 30 min 12 steps 16143 views Rating: 4.3/5 Published: 2026-02-15

Remove the zip cover and any lining on the mattress foam.. Use measuring tape to determine where you should cut the foam.. Mark the line you want to cut with a marker.

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Steps

1

Remove the zip cover and any lining on the mattress foam.

Step 1

Remove the zip cover and any lining on the mattress foam.

2

Use measuring tape to determine where you should cut the foam.

Step 2

Use measuring tape to determine where you should cut the foam.

3

Mark the line you want to cut with a marker.

Step 3

Mark the line you want to cut with a marker.

4

Elevate the mattress foam so the marked line doesn't have anything under it.

Step 4

Elevate the mattress foam so the marked line doesn't have anything under it.

5

Use an electric carving knife to cut the foam if you want a clean edge.

Step 5

Use an electric carving knife to cut the foam if you want a clean edge.

6

Try a regular kitchen knife if you don't want to get an electric one.

Step 6

Try a regular kitchen knife if you don't want to get an electric one.

7

Hold the knife at a 90-degree angle to the foam at the edge.

Step 7

Hold the knife at a 90-degree angle to the foam at the edge.

8

Cut along the marked line using an up-and-down motion.

Step 8

Cut along the marked line using an up-and-down motion.

9

Repeat on the other side if the knife doesn't go all the way through.

Step 9

Repeat on the other side if the knife doesn't go all the way through.

10

Double check your measurements using measuring tape.

Step 10

Double check your measurements using measuring tape.

11

Smooth out any jagged edges with a knife.

Step 11

Smooth out any jagged edges with a knife.

12

Put the new or altered zip cover over the mattress foam if you'll be using one.

Step 12

Put the new or altered zip cover over the mattress foam if you'll be using one.

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Comments (1)

Marco Bellini 2025-10-20
Made three of these as holiday gifts. People loved them! The gathering knot tutorial was really clear.
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