How is combat level calculated in OSRS?

Base = ¼ × (Defence + Hitpoints + ⌊Prayer ÷ 2⌋). Melee = 13⁄40 × (Attack + Strength); Ranged = 13⁄40 × ⌊1.5 × Ranged⌋; Magic = 13⁄40 × ⌊1.5 × Magic⌋. Your level is ⌊Base + the highest of the three⌋.

What is the max combat level?

126 with maxed melee. A pure ranged or magic build tops out at 109.

Why does an even Prayer level matter?

Only half your Prayer counts, rounded down, so going from an even to an odd Prayer level never changes your combat level.

Combat level calculator

Enter your combat stats. Your level is a quarter of Defence + Hitpoints + half your Prayer, plus the best of your melee, ranged or magic contribution, rounded down.

Attack

Strength

Defence

Hitpoints

Prayer

Ranged

Magic

Combat level

3.40 exactly · melee based

To reach 4, gain any one of:

2 Attack levels
2 Strength levels
3 Defence levels
3 Hitpoints levels
5 Prayer levels
2 Ranged levels
2 Magic levels

Questions

How is combat level calculated in OSRS?: Base = ¼ × (Defence + Hitpoints + ⌊Prayer ÷ 2⌋). Melee = 13⁄40 × (Attack + Strength); Ranged = 13⁄40 × ⌊1.5 × Ranged⌋; Magic = 13⁄40 × ⌊1.5 × Magic⌋. Your level is ⌊Base + the highest of the three⌋.
What is the max combat level?: 126 with maxed melee. A pure ranged or magic build tops out at 109.
Why does an even Prayer level matter?: Only half your Prayer counts, rounded down, so going from an even to an odd Prayer level never changes your combat level.