What does 100% increased Area of Effect do to a skill's radius?

It doubles the area, so the radius becomes ×1.41 (Fireball's 1.7 m explosion becomes 2.3 m).

Area of Effect: Skill Radius in Metres

Every skill's radius, and what increased Area of Effect does to it · Path of Exile 2✓ Checked against game files · 0.5.5

Path of Exile 2 shows skill areas as a radius in metres. Of 137 skills with a radius, the largest at gem level 20 is Time Freeze (wave 10.0 m); Fireball's explosion is 1.7 m. Area of Effect modifiers scale the area, so the radius grows with the square root: 100% increased Area of Effect makes a radius ×1.41, not ×2. 41 radii grow with gem level. Patch 0.5.5, from the game files.

How far is that: a metre ruler of real skills

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Radius at gem level 20, to scale. Diameter is twice this: a 3 m radius covers a 6 m wide circle.

25% increased AoE

×1.12

radius (area ×1.25)

50% increased AoE

×1.22

radius (area ×1.50)

100% increased AoE

×1.41

radius (area ×2.00)

200% increased AoE

×1.73

radius (area ×3.00)

Radius calculator

Skill

% increased Area of Effect% more Area of Effect

Fireball · Explosion radius

2.0 m from 1.7 m

Area ×1.50 (13 m²), radius +18%

Next +0.1 m at 54% increased (4% more than now).

All 168 skill radii

Skill	Level 1	Level 20	Area	+100% AoE
Time Freezewave	10.0 m	10.0 m	314 m²	14.1 m
The Stars Answertargeting	8.0 m	8.0 m	201 m²	11.2 m
Ferocious Roarwarcry	7.0 m	7.0 m	154 m²	9.8 m
Arctic Howlwarcry	5.5 m	5.5 m	95 m²	7.7 m
Rite of Restorationsigil	4.5 m	4.5 m	64 m²	6.3 m
Ancestral Crywarcry	4.0 m	4.0 m	50 m²	5.6 m
Feast of Fleshcorpse consumption	4.0 m	4.0 m	50 m²	5.6 m
Fortifying Crywarcry	4.0 m	4.0 m	50 m²	5.6 m
Grim Pillarscreation	4.0 m	4.0 m	50 m²	5.6 m
His Vile Intrusionexplosion	4.0 m	4.0 m	50 m²	5.6 m
Hollow Shellpulse	3.0 m	4.0 m	50 m²	5.6 m
Infernal Crywarcry	4.0 m	4.0 m	50 m²	5.6 m
Moment of Vulnerabilitynova	4.0 m	4.0 m	50 m²	5.6 m
Righteous Descentimpact	2.5 m	4.0 m	50 m²	5.6 m
Seismic Crywarcry	4.0 m	4.0 m	50 m²	5.6 m
Thrashing Vinesvine growth area	4.0 m	4.0 m	50 m²	5.6 m
Elemental Expressionexplosion	3.6 m	3.6 m	41 m²	5.0 m
Orb of Stormsorb	3.6 m	3.6 m	41 m²	5.0 m
Rain of Arrowsrain	3.6 m	3.6 m	41 m²	5.0 m
Bitter Deadtransformation	3.5 m	3.5 m	38 m²	4.9 m
Frostflame Novawave	3.5 m	3.5 m	38 m²	4.9 m
Cometimpact	2.8 m	3.4 m	36 m²	4.7 m
Flash Grenadeexplosion	2.6 m	3.3 m	34 m²	4.6 m
Ice Novanova	3.2 m	3.2 m	32 m²	4.5 m
Lightning Arrowbeam targeting	3.2 m	3.2 m	32 m²	4.5 m
Snapfrostbolt explosion	3.2 m	3.2 m	32 m²	4.5 m
Stampedeimpact and jagged ground	1.2 m	3.2 m	32 m²	4.5 m
Conductivitycurse	1.5 m	3.1 m	30 m²	4.3 m
Despaircurse	1.5 m	3.1 m	30 m²	4.3 m
Elemental Weaknesscurse	1.5 m	3.1 m	30 m²	4.3 m
Enfeeblecurse	1.5 m	3.1 m	30 m²	4.3 m
Flammabilitycurse	1.5 m	3.1 m	30 m²	4.3 m
Hypothermiacurse	1.5 m	3.1 m	30 m²	4.3 m
Inevitable Agonyinitial cast	1.5 m	3.1 m	30 m²	4.3 m
Temporal Chainscurse	1.5 m	3.1 m	30 m²	4.3 m
Vulnerabilitycurse	1.5 m	3.1 m	30 m²	4.3 m
Briarpatchthorny ground	3.0 m	3.0 m	28 m²	4.2 m
Firestormstorm	3.0 m	3.0 m	28 m²	4.2 m
Furious Slamshockwave	2.0 m	3.0 m	28 m²	4.2 m
Lightning Warpexplosion and shocked ground	3.0 m	3.0 m	28 m²	4.2 m
Queen's Processionswarm	3.0 m	3.0 m	28 m²	4.2 m
Sigil of Powersigil	3.0 m	3.0 m	28 m²	4.2 m
Siphoning Strikeshockwave	3.0 m	3.0 m	28 m²	4.2 m
Skyfallimpact	3.0 m	3.0 m	28 m²	4.2 m
Snipeexplosion	2.5 m	3.0 m	28 m²	4.2 m
Tornadotornado	3.0 m	3.0 m	28 m²	4.2 m
Toxic Domaintoxic bloom	3.0 m	3.0 m	28 m²	4.2 m
Cometimpact	2.8 m	2.8 m	25 m²	3.9 m
His Foul Emergenceemergence	2.8 m	2.8 m	25 m²	3.9 m
Enervating Novaring outer	2.6 m	2.6 m	21 m²	3.6 m
Icestormstorm	2.6 m	2.6 m	21 m²	3.6 m
Oil Grenadedamage and oil spray	2.0 m	2.6 m	21 m²	3.6 m
Abyssal Pactdamage	2.5 m	2.5 m	20 m²	3.5 m
Bursting Fen Toadtoad explosion	2.5 m	2.5 m	20 m²	3.5 m
Cluster Grenadeexplosion	2.5 m	2.5 m	20 m²	3.5 m
Leap Slamimpact	2.5 m	2.5 m	20 m²	3.5 m
Living Bombexplosion	2.5 m	2.5 m	20 m²	3.5 m
Righteous Descentimpact	2.5 m	2.5 m	20 m²	3.5 m
Snipeexplosion	2.5 m	2.5 m	20 m²	3.5 m
Solar Orbexplosion	2.5 m	2.5 m	20 m²	3.5 m
Starborn Onslaughtimpact	2.5 m	2.5 m	20 m²	3.5 m
Detonate Minionexplosion	2.4 m	2.4 m	18 m²	3.3 m
Detonating Arrowexplosion	2.4 m	2.4 m	18 m²	3.3 m
Escape Shotimpact	2.4 m	2.4 m	18 m²	3.3 m
Explosive Grenadeexplosion	2.0 m	2.4 m	18 m²	3.3 m
Frostboltexplosion	2.4 m	2.4 m	18 m²	3.3 m
Phantasmal Arrowexplosion	1.5 m	2.4 m	18 m²	3.3 m
Poisonburst Arrowburst	1.5 m	2.4 m	18 m²	3.3 m
Rapid Assaultexplosion	2.4 m	2.4 m	18 m²	3.3 m
Shield Chargeimpact	2.4 m	2.4 m	18 m²	3.3 m
Stormcaller Arrowimpact	1.5 m	2.4 m	18 m²	3.3 m
Vaulting Impactimpact	2.4 m	2.4 m	18 m²	3.3 m
Vine Arrowimpact	0.8 m	2.4 m	18 m²	3.3 m
Voltaic Grenadeexplosion	2.0 m	2.4 m	18 m²	3.3 m
Hollow Focusshockwave	2.3 m	2.3 m	17 m²	3.2 m
Resonating Shieldshockwave	2.3 m	2.3 m	17 m²	3.2 m
Thunderstormstorm	2.3 m	2.3 m	17 m²	3.2 m
Consecrateconsecrated ground	2.2 m	2.2 m	15 m²	3.1 m
Fangs of Frostexplosion and chilled ground	2.2 m	2.2 m	15 m²	3.1 m
Profane Ritualritual	2.2 m	2.2 m	15 m²	3.1 m
Rampageimpact	2.2 m	2.2 m	15 m²	3.1 m
Oil Barrageoil spray	2.1 m	2.1 m	14 m²	2.9 m
Untetherexplosion	2.1 m	2.1 m	14 m²	2.9 m
Bitter Deadtransformation	3.5 m	2.0 m	13 m²	2.8 m
Boneshattershockwave	2.0 m	2.0 m	13 m²	2.8 m
Disengageshockwave	2.0 m	2.0 m	13 m²	2.8 m
Flame Breathimmolation	2.0 m	2.0 m	13 m²	2.8 m
Frost Wallexplosion	2.0 m	2.0 m	13 m²	2.8 m
Furious Slamshockwave	2.0 m	2.0 m	13 m²	2.8 m
Gas Grenadeimpact	1.4 m	2.0 m	13 m²	2.8 m
Grim Pillarscreation	4.0 m	2.0 m	13 m²	2.8 m
Harbinger of Madnessexplosion	2.0 m	2.0 m	13 m²	2.8 m
Hexblastexplosion	2.0 m	2.0 m	13 m²	2.8 m
Hollow Resonanceshockwave	2.0 m	2.0 m	13 m²	2.8 m
Molten Crashimpact	2.0 m	2.0 m	13 m²	2.8 m
Pounceimpact	2.0 m	2.0 m	13 m²	2.8 m
Spear of Solarisimpact	2.0 m	2.0 m	13 m²	2.8 m
Spear of Solarisimpact	2.0 m	2.0 m	13 m²	2.8 m
Spear Throwexplosion	2.0 m	2.0 m	13 m²	2.8 m
Starborn Onslaughtimpact	2.5 m	2.0 m	13 m²	2.8 m
Galvanic Fieldfield	1.9 m	1.9 m	11 m²	2.6 m
Runic Temperingbacklash	1.9 m	1.9 m	11 m²	2.6 m
Acidic Concoctionexplosion	1.8 m	1.8 m	10 m²	2.5 m
Bleeding Concoctionexplosion	1.8 m	1.8 m	10 m²	2.5 m
Bone Cagecage	1.8 m	1.8 m	10 m²	2.5 m
Chaotic Surgeexplosion	1.8 m	1.8 m	10 m²	2.5 m
Devourimpact	1.8 m	1.8 m	10 m²	2.5 m
Earthquakeimpact	1.8 m	1.8 m	10 m²	2.5 m
Earthquakejagged ground	1.8 m	1.8 m	10 m²	2.5 m
Elemental Stormstorm	1.8 m	1.8 m	10 m²	2.5 m
Elemental Surgeexplosion	1.8 m	1.8 m	10 m²	2.5 m
Explosive Concoctionexplosion	1.8 m	1.8 m	10 m²	2.5 m
Forge Hammerimpact	1.8 m	1.8 m	10 m²	2.5 m
Fulminating Concoctionexplosion	1.8 m	1.8 m	10 m²	2.5 m
Ice Fragmentsexplosion	1.8 m	1.8 m	10 m²	2.5 m
Rolling Magmaimpact	1.4 m	1.8 m	10 m²	2.5 m
Rolling Slamimpact	1.4 m	1.8 m	10 m²	2.5 m
Shattering Concoctionexplosion	1.8 m	1.8 m	10 m²	2.5 m
Whirling Slashwhirlwind	1.8 m	1.8 m	10 m²	2.5 m
Whirlwind Lancewhirlwind	1.8 m	1.8 m	10 m²	2.5 m
Contagionspread	1.7 m	1.7 m	9 m²	2.3 m
Fireballexplosion	1.7 m	1.7 m	9 m²	2.3 m
Decomposecloud	1.6 m	1.6 m	8 m²	2.2 m
Gemini Surgeexplosion	1.6 m	1.6 m	8 m²	2.2 m
Herald of Iceexplosion	1.6 m	1.6 m	8 m²	2.2 m
Ice Novanova	3.2 m	1.6 m	8 m²	2.2 m
Leylinesleyline	1.6 m	1.6 m	8 m²	2.2 m
Molten Blastexplosion	1.6 m	1.6 m	8 m²	2.2 m
Smash to Smithereensimpact	1.6 m	1.6 m	8 m²	2.2 m
Snapenemy explosion	1.6 m	1.6 m	8 m²	2.2 m
Supercharged Slamimpact	1.6 m	1.6 m	8 m²	2.2 m
Toxic Domaintoxic bloom	3.0 m	1.6 m	8 m²	2.2 m
Acidic Concoctionburst	1.5 m	1.5 m	7 m²	2.1 m
Bitter Deadtransformation	3.5 m	1.5 m	7 m²	2.1 m
Bitter Deadtransformation	3.5 m	1.5 m	7 m²	2.1 m
Grenadeexplosion	1.5 m	1.5 m	7 m²	2.1 m
Herald of Bloodexplosion	1.5 m	1.5 m	7 m²	2.1 m
Herald of the Royal Queenexplosion	1.5 m	1.5 m	7 m²	2.1 m
Shattering Spiteexplosion	1.5 m	1.5 m	7 m²	2.1 m
Cluster Grenadeexplosion	2.5 m	1.4 m	6 m²	1.9 m
Magnetic Salvoimpact	1.0 m	1.4 m	6 m²	1.9 m
Rolling Slamimpact	1.4 m	1.4 m	6 m²	1.9 m
Earthquakeimpact	1.8 m	1.2 m	5 m²	1.6 m
Explosive Concoctionexplosion	1.8 m	1.2 m	5 m²	1.6 m
Fragments Of The Pasteruption	1.2 m	1.2 m	5 m²	1.6 m
Freezing Salvoimpact	1.2 m	1.2 m	5 m²	1.6 m
Grim Pillarseruption	1.2 m	1.2 m	5 m²	1.6 m
Herald of Ashexplosion	1.2 m	1.2 m	5 m²	1.6 m
Stampedeimpact and jagged ground	1.2 m	1.2 m	5 m²	1.6 m
Supercharged Slamimpact	1.6 m	1.2 m	5 m²	1.6 m
Volcanoeruption	1.2 m	1.2 m	5 m²	1.6 m
Bone Blastritual	1.0 m	1.0 m	3 m²	1.4 m
Bone Cageexplosion	1.0 m	1.0 m	3 m²	1.4 m
Enervating Novaring inner	1.0 m	1.0 m	3 m²	1.4 m
Forge Hammerimpact	1.8 m	1.0 m	3 m²	1.4 m
Magnetic Salvoimpact	1.0 m	1.0 m	3 m²	1.4 m
Molten Showerexplosion	1.0 m	1.0 m	3 m²	1.4 m
Solar Orbexplosion	2.5 m	1.0 m	3 m²	1.4 m
Tornado Shotimpact	1.0 m	1.0 m	3 m²	1.4 m
Lightning Boltimpact	0.8 m	0.8 m	2 m²	1.1 m
Thunderstormimpact	0.8 m	0.8 m	2 m²	1.1 m
Vine Arrowimpact	0.8 m	0.8 m	2 m²	1.1 m
Fireboltexplosion	0.7 m	0.7 m	2 m²	0.9 m
Frost Bombpulse and explosion	0.7 m	0.7 m	2 m²	0.9 m
Rain of Arrowsarrow impact	0.7 m	0.7 m	2 m²	0.9 m
Glacial Cascadeburst	0.6 m	0.6 m	1 m²	0.8 m
Twistertwister	0.5 m	0.5 m	1 m²	0.7 m
Glacial Cascadeburst	0.6 m	0.3 m	0 m²	0.4 m

How it is worked out

Radii are the skill text at each gem level (game files: GrantedEffectsPerLevel and stat descriptions), stored by the game in tenths of a metre. Area of Effect multiplies the area: area = round(100 × (1 + increased)) × round(100 × more) / 100, floored; radius = base × floor(100 × √area) / 100, floored — the client's rounding as Path of Building for PoE2 implements it (CalcOffence.lua).

Assumptions

Only lines that say "… radius is N metres"; lengths, cones and flat "+N metres" bonuses are left out.
Most radii grow with Area of Effect; a few skills say otherwise in their own text.
Gem levels 1 and 20 without quality; supports and passives that change Area of Effect go in the calculator.