Rug Pad Size Calculator â What Size Pad Do I Need?
Enter your rug's length and width to get the right rug pad size â plus pad type advice for your floor. No sign-up, no data stored.
Pad size
How pad size is calculated
- Rule: the pad should be about 2 inches smaller than the rug â 1 inch of rug margin on every side.
- Math: pad length = rug length â 2 in; pad width = rug width â 2 in.
- Why: a smaller pad hides completely under the rug, stops it sliding, and never curls up or shows at the edge.
- Trimming: most pads are easy to cut with scissors or a utility knife if you need a custom size.
Round rugs and odd shapes: use the widest points, then trim the pad to fit the outline. If your rug has fringe, tuck it under the rug â don't let the pad grip it.
Rug pad size chart
Common rug sizes and the pad that fits them.
| Rug size | Pad size |
|---|---|
| 4 Ã 6 ft | 3'10" Ã 5'10" |
| 5 Ã 8 ft | 4'10" Ã 7'10" |
| 6 Ã 9 ft | 5'10" Ã 8'10" |
| 8 Ã 10 ft | 7'10" Ã 9'10" |
| 9 Ã 12 ft | 8'10" Ã 11'10" |
| 10 Ã 14 ft | 9'10" Ã 13'10" |
Last updated: October 2026 · The 2-in-smaller rule suits felt + rubber pads on hard floors. Very plush rugs can use a 1-in margin; berber and looped rugs often skip pads entirely.
Rug pad calculator FAQ
An 7'10" Ã 9'10" pad â 2 inches smaller all around. It should never stick out past the rug edge.
Yes â about 2 inches smaller all around (1 inch per side). A pad that's larger or exactly matches shows at the edges or curls up.
An 8'10" Ã 11'10" pad â 2 inches smaller on both dimensions. Rug pads are easy to trim with scissors or a utility knife.
Felt + rubber pads are best for most floors â cushioning, grip, and floor protection in one. Use felt-only on delicate hardwood to avoid rubber marking.
No â carpet grips the rug on its own. On hard floors, a pad is essential to stop sliding and protect the finish.