How to Choose the Right Mattress Firmness — The Scientific Way

Do you feel this too?
Some mattresses are too soft, some are too hard —
and after sleeping on them, your back just hurts.

But mattress firmness isn’t guesswork. There is a real standard.

Mattress firmness is rated from1 to 10.
👉 Lower numbers = firmer
👉 Higher numbers = softer
Reliable brands will list this in their product details — that’s your first reference.

Step 2: Use your BMI as a guideline

For example:
Height 1.75 m, weight 90 kg → higher BMI
👉 You usually need a firmer mattress for better support.

But this is only a starting point — not the final answer.

Your sleeping position and body condition matter

For heavier people:
If you sleep on your side, the mattress can’t be too hard.
Your shoulders and hips need pressure relief,
so you need a mattress thatconforms on top but supports underneath.

For lighter people:
You can go softer — but if you’re pregnant or sit a lot,
your waist needs stronger support.
Choose a mattress that issupportive, not sagging.

Remember this:
Soft doesn’t mean comfortable.
Hard doesn’t mean healthy.
A good mattress lets the right parts sink and keeps your spine supported.

One last thing most people forget

Many brands offer trial periods.
Always check:
✔ When the trial starts
✔ Who pays return shipping
✔ Whether free gifts affect returns

Miss these details, and you may get trapped.