The right mattress firmness depends on three things: how you sleep, how much you weigh, and whether you have any pain points. For most adults, medium-firm (about a 6 on a 10-point scale) is the safest choice. It supports the spine without creating pressure points. If you’re searching for a mattress near me and trying to figure out whether to go soft, medium, or firm, this guide breaks it down by sleep position and body type so you walk into the showroom with a plan.
How the Firmness Scale Works
Most retailers use a 1-to-10 scale where 1 is the softest and 10 is the firmest. Here’s how the levels generally feel:
| Rating | Feel | Best For |
| 1-2 | Extra soft | Lightweight side sleepers under 130 lbs |
| 3-4 | Soft | Side sleepers with shoulder/hip pain |
| 5-6 | Medium / Medium-firm | Most sleepers, combo sleepers, back pain |
| 7-8 | Firm | Stomach sleepers, heavier sleepers |
| 9-10 | Extra firm | Very heavy sleepers, medical recommendations |
There’s no industry-wide standard, so a “medium-firm” from one brand might feel different from another’s. That’s why testing in person matters.
Why Medium-Firm Is the Default
Cleveland Clinic chiropractor Dr. Andrew Bang recommends a medium-firm mattress for most people, citing research that shows it can improve sleep quality by 55% and reduce chronic back pain. The idea is balance: firm enough to support the spine, soft enough to relieve pressure on the shoulders and hips.
The old advice that “firmer is always better” turned out to be wrong. A 2003 Lancet study split chronic back pain patients between firm and medium-firm mattresses, and the medium-firm group reported less pain and better sleep.
Pick by Sleep Position
Your sleep position changes where your body presses hardest into the mattress. The right firmness keeps your spine straight regardless of how you sleep.
Side Sleepers: Medium to Medium-Firm (5-6)
Side sleeping concentrates weight on your shoulder and hip. If the mattress is too firm, those points can’t sink in enough, and your spine bows sideways. If it’s too soft, your hips drop too deep.
Lighter side sleepers (under 130 pounds) often do well with something on the softer end (3-5). Heavier side sleepers usually want medium-firm (5-6). Memory foam and softer hybrid mattresses are usually the best fit because they cushion pressure points.
Back Sleepers: Medium-Firm (6-7)
Back sleeping puts the most pressure on the lower back. You need enough firmness to support the natural curve of your lumbar spine without letting your hips sag.
A medium-firm mattress lets your shoulders and hips settle slightly while keeping your lower back supported. Hybrids work especially well here because the coils provide structural support and the foam fills the lumbar gap.
Stomach Sleepers: Firm (6.5-7.5)
Stomach sleeping is hardest on the back. Your hips are the heaviest part of your body, and gravity pulls them down into the mattress. If the bed is too soft, your spine ends up curved into a U all night.
Stomach sleepers need a firmer mattress to keep the hips lifted. Mayo Clinic actually recommends avoiding stomach sleeping when possible because of the strain it puts on the spine, but if you can’t switch, a firm mattress is the workaround.
Combination Sleepers: Medium-Firm (5-6)
If you switch positions through the night, you need a mattress that handles all of them. Medium-firm hybrids are usually the safest bet because they’re responsive enough to make rolling over easy but soft enough to cushion the shoulder when you land on your side.
Pick by Body Weight
Body weight changes how much you compress the mattress. The same firmness rating feels different depending on how heavy you are.
Under 130 Pounds
You won’t sink into the mattress as much, so a firmer rating will feel firmer to you than to a heavier sleeper. Go one step softer than the standard recommendation. A mattress rated medium will probably feel firm to you.
130 to 230 Pounds
The standard firmness ratings will feel about as advertised. Most “medium-firm” recommendations apply directly to this range.
Over 230 Pounds
You’ll compress the mattress more, so a “medium” might feel soft. Go one step firmer than the standard recommendation. Heavier sleepers also tend to do better on hybrids than all-foam beds because the coils hold up better over time.
How Firmness Affects Back Pain
If you wake up with lower back pain, the wrong firmness is often the cause. Cleveland Clinic notes that morning back pain often comes from a mattress that’s too soft and lets the spine sag, or one that’s worn out and sagging in the middle. Pain management specialist Dr. Tara-Lin Hollins recommends a medium-firm mattress (around 6 on a 10-point scale) for most people with back pain.
The key signs your firmness is wrong:
- Pain that fades within an hour of getting up usually means the mattress is the issue
- Pain between the shoulder blades or in the hips often means the bed is too firm
- Pain in the lower back often means the bed is too soft or sagging
For more on how a hybrid mattress can address back pain specifically, see our piece on back pain relief and hybrid mattresses.
Couples: When You Disagree on Firmness
If you and your partner have different firmness preferences:
- Compromise on medium-firm. Not anyone’s first choice but it works for most people.
- Get a split king. Two Twin XL mattresses with different firmness levels, side by side.
- Choose a flippable mattress. Some have a firmer side and softer side in one bed.
A split king is the most popular solution for couples who really can’t agree, especially if one of you has back pain.
Common Firmness Mistakes
Buying based on how it feels in the first 30 seconds. Lie on the mattress for 10 to 15 minutes minimum.
Confusing soft with comfortable. Soft feels great when you sit on the edge. After eight hours, soft can mean back pain.
Ignoring what’s on top. A pillow-top adds plushness without changing the support. A medium-firm mattress with a soft pillow-top feels different than a medium-firm bed all the way through.
Forgetting about the foundation. A mattress on a worn-out box spring will feel softer than the same mattress on a solid platform.
How to Test Firmness In-Store
When you’re testing mattresses near you, run through this checklist:
- Lie on each mattress in your real sleep position for 10-15 minutes
- Slide a hand under your lower back. Big gap means too firm. Easy slide means about right. Hard to slide means too soft.
- Roll over. Easy roll means good responsiveness. Stuck-in-the-mud feel means too soft.
- If you have a partner, test it together. Two bodies compress differently than one.
What’s Stocked at Payless Furniture
Payless Furniture & Mattress carries a range of firmnesses across Ashley Sleep, Sierra Sleep, and other brands, including innerspring, memory foam, and hybrid options. Stop in at 116 Central Ave. West to test the firmness levels in person, or call 406-453-4582 to ask which mattresses are in stock today.
For the bigger picture on what to test, what to ask, and how to time your purchase, see our complete mattress shopping guide for Great Falls.
Quick Firmness Cheat Sheet
- Side sleeper, average weight: 5-6 (medium to medium-firm)
- Back sleeper, average weight: 6-7 (medium-firm)
- Stomach sleeper: 6.5-7.5 (firm)
- Lighter than 130 lbs: Go one step softer than these recommendations
- Heavier than 230 lbs: Go one step firmer
- Back pain: Medium-firm (6) is the research-backed default
- Couples who disagree: Split king with two firmness levels
When in doubt, go medium-firm. It works for the majority of sleepers and is the safest pick if you’re not sure where you fall.