What are the different firmness levels for mattresses?

Mattress firmness is typically measured on a scale of 1 to 10, with 1 being the softest and 10 being the firmest.

Soft mattresses (1-3): Suitable for side sleepers, and can relieve pressure.

Medium-firm mattresses (4-6): Suitable for most people, and can provide good support and comfort.
Firm mattresses (7-10): Suitable for back and stomach sleepers, can provide better support.