It seems closer to a 10-15% damage boost, and it gives you +50% STR for the purposes of wielding weapons. You'd actually need 20 STR to two-hand a 30 STR weapon. Two-handed attacks also tend to use more stamina, so the damage boost might not be worth it depending on the situation.

Consider helping out in updating the wiki for 3.9.0 - see Path of Exile Wiki:To-do list/3.9.0.

Two handed melee weapon is a keyword which applies to the use of melee weapons which take up both Main Hand and Off Hand equipment slots.

Weapons which count as Two Handed Melee Weapon:

Do strength weapons do more dmg when 2h meanWeapons
  • 1Passive skills

Passive skills

There are passive skills that grant two handed melee weapon bonuses.

Physical damage with two handed melee weapons

These passive skills grant increased physical damage with two handed melee weapons.

NameStats
Two Handed Melee Damage
12% increased Physical Damage with Two Handed Melee Weapons
12% increased Damage with Ailments from Attack Skills while wielding a Two Handed Weapon
14% increased Physical Damage with Two Handed Melee Weapons
14% increased Damage with Ailments from Attack Skills while wielding a Two Handed Weapon [1]
Two Handed Melee Damage and Area of Effect
10% increased Physical Damage with Two Handed Melee Weapons
10% increased Damage with Ailments from Attack Skills while wielding a Two Handed Weapon
5% increased Area of Effect
Two Handed Melee Damage and Attack Speed
10% increased Physical Damage with Two Handed Melee Weapons
3% increased Attack Speed with Two Handed Melee Weapons
10% increased Damage with Ailments from Attack Skills while wielding a Two Handed Weapon
Two Handed Melee Damage and Leech
12% increased Physical Damage with Two Handed Melee Weapons
12% increased Damage with Ailments from Attack Skills while wielding a Two Handed Weapon
0.4% of Physical Attack Damage Leeched as Life [1]
Two Handed Melee Damage and Life Leech Speed
12% increased Physical Damage with Two Handed Melee Weapons
12% increased Damage with Ailments from Attack Skills while wielding a Two Handed Weapon
25% increased total Recovery per second from Life Leech
Two Handed Melee Damage and Reduced Enemy Stun Threshold
12% increased Physical Damage with Two Handed Melee Weapons
12% increased Damage with Ailments from Attack Skills while wielding a Two Handed Weapon
5% reduced Enemy Stun Threshold [1]
Two Handed Melee Damage and Stun Duration
12% increased Physical Damage with Two Handed Melee Weapons
12% increased Damage with Ailments from Attack Skills while wielding a Two Handed Weapon
10% increased Stun Duration with Two Handed Melee Weapons on Enemies [1]
12% increased Physical Damage with Two Handed Melee Weapons
12% increased Damage with Ailments from Attack Skills while wielding a Two Handed Weapon
20% increased Stun Duration with Two Handed Melee Weapons on Enemies [1]
Butchery
25% increased Physical Damage with Two Handed Melee Weapons
+20 to Strength
5% increased Attack Speed with Two Handed Melee Weapons
25% increased Damage with Ailments from Attack Skills while wielding a Two Handed Weapon [1]
Destroyer
12% increased Accuracy Rating with Two Handed Melee Weapons
25% increased Physical Damage with Two Handed Melee Weapons
5% increased Attack Speed with Two Handed Melee Weapons
25% increased Damage with Ailments from Attack Skills while wielding a Two Handed Weapon [1]
Executioner
24% increased Physical Damage with Two Handed Melee Weapons
50% increased Damage with Hits against Enemies that are on Low Life
24% increased Damage with Ailments from Attack Skills while wielding a Two Handed Weapon
8% increased Area of Effect if you've Killed Recently [1]
Kinetic Impacts
24% increased Physical Damage with Two Handed Melee Weapons
24% increased Damage with Ailments from Attack Skills while wielding a Two Handed Weapon
4% chance to deal Double Damage
10% chance to double Stun Duration
Enemies have -15% to Total Physical Damage Reduction against your Hits [1]
Martial Experience
30% increased Physical Damage with Two Handed Melee Weapons
30% increased Damage with Ailments from Attack Skills while wielding a Two Handed Weapon
50% increased total Recovery per second from Life Leech
0.8% of Physical Attack Damage Leeched as Life
Enemies have -12% to Total Physical Damage Reduction against your Hits [1]

Accuracy rating with two handed melee weapons

These passive skills grant increased accuracy rating with two handed melee weapons.

NameStats
Two Handed Melee Critical Strike Chance and Accuracy
20% increased Critical Strike Chance with Two Handed Melee Weapons
6% increased Accuracy Rating with Two Handed Melee Weapons
Destroyer
12% increased Accuracy Rating with Two Handed Melee Weapons
25% increased Physical Damage with Two Handed Melee Weapons
5% increased Attack Speed with Two Handed Melee Weapons
25% increased Damage with Ailments from Attack Skills while wielding a Two Handed Weapon [1]
Titanic Impacts
40% increased Critical Strike Chance with Two Handed Melee Weapons
12% increased Accuracy Rating with Two Handed Melee Weapons
+20% to Critical Strike Multiplier with Two Handed Melee Weapons [1]

Attack speed with two handed melee weapons

Do Strength Weapons Do More Dmg When 2h

Do Strength Weapons Do More Dmg When 2h Go

These passive skills grant increased attack speed with two handed melee weapons.

NameStats
Two Handed Attack Speed
4% increased Attack Speed with Two Handed Melee Weapons [1]
Two Handed Melee Damage and Attack Speed
10% increased Physical Damage with Two Handed Melee Weapons
3% increased Attack Speed with Two Handed Melee Weapons
10% increased Damage with Ailments from Attack Skills while wielding a Two Handed Weapon
Butchery
25% increased Physical Damage with Two Handed Melee Weapons
+20 to Strength
5% increased Attack Speed with Two Handed Melee Weapons
25% increased Damage with Ailments from Attack Skills while wielding a Two Handed Weapon [1]
Destroyer
12% increased Accuracy Rating with Two Handed Melee Weapons
25% increased Physical Damage with Two Handed Melee Weapons
5% increased Attack Speed with Two Handed Melee Weapons
25% increased Damage with Ailments from Attack Skills while wielding a Two Handed Weapon [1]
Wrecking Ball
20% increased Damage with Two Handed Weapons
10% increased Attack Speed with Two Handed Melee Weapons
20% increased Damage with Ailments from Attack Skills while wielding a Two Handed Weapon
20% increased Stun Duration with Two Handed Melee Weapons on Enemies [1]

Stun with two handed melee weapons

These passive skills grant increased stun duration with two handed melee weapons.

NameStats
Two Handed Melee Damage and Stun Duration
12% increased Physical Damage with Two Handed Melee Weapons
12% increased Damage with Ailments from Attack Skills while wielding a Two Handed Weapon
10% increased Stun Duration with Two Handed Melee Weapons on Enemies [1]
12% increased Physical Damage with Two Handed Melee Weapons
12% increased Damage with Ailments from Attack Skills while wielding a Two Handed Weapon
20% increased Stun Duration with Two Handed Melee Weapons on Enemies [1]
Wrecking Ball
20% increased Damage with Two Handed Weapons
10% increased Attack Speed with Two Handed Melee Weapons
20% increased Damage with Ailments from Attack Skills while wielding a Two Handed Weapon
20% increased Stun Duration with Two Handed Melee Weapons on Enemies [1]

Other

NameStats
Two Handed Melee Critical Strike Chance and Accuracy
20% increased Critical Strike Chance with Two Handed Melee Weapons
6% increased Accuracy Rating with Two Handed Melee Weapons
Titanic Impacts
40% increased Critical Strike Chance with Two Handed Melee Weapons
12% increased Accuracy Rating with Two Handed Melee Weapons
+20% to Critical Strike Multiplier with Two Handed Melee Weapons [1]

Ascendancy passive skills

Ascendancy
Class
NameStats

Do Strength Weapons Do More Dmg When 2h Start

Retrieved from 'https://pathofexile.gamepedia.com/index.php?title=Two_Handed_Melee_Weapon&oldid=559134'