Size of a unit (champions, minions, monsters, pets and player-generated terrain) refers to their Gameplay Radius, also commonly known as hitbox radius.
For other types of unit radii, see: Unit radius
It plays a role for spells that calculate their range based on the target's 
edge of their gameplay radius. In particular targeted edge-to-edge spells add both their caster's and their target's gameplay radius to their range. Most notably, 
basic attacks are edge-to-edge spells.
- Main article: Range
Projectiles (Missiles) have no gameplay radius, instead their hitbox depends on a width value.
Lists of Unit Sizes (Total Values)
Champions
All Champion radiuses, when not modified by 
status effects, range from 55 to 80 units.
- Clones have the same radius as their champion counterpart (do no clones copy size modifiers os only Illaoi E?)
- Target dummies have a base gameplay radius of 65, like most champions. Their size can be up-to doubled (130), relevant for testing purposes, with a Command available in Practice Tool (See below).
Minions
- Melee minions and caster minions: 48
- Melee minions empowered by Hand of Baron: 62.4
-
- Siege minions and super minions: 65
- Siege minions empowered by Hand of Baron: 84.5
- Super minions empowered by Hand of Baron: 74.75
-
- Summoned Rift Herald: 110 (Same as neutral Rift Herald)
Monsters
- Baron Nashor: 105
- All Dragons: 125
- Rift Herald: 110
- Blue Sentinel: 131
- Red Brambleback: 120
- Gromp: 120
- Ancient Krug: 100
- Krug: 50
- Lesser Krug: 25
- Greater Murk Wolf: 80
- Murk Wolf: 50
- Crimson Raptor: 75
- Raptor: 50
- Rift Scuttler: 50
Pets
Clones have the same unit radii as the champion they're copying.
Below: Pet unti radii based on data values. All of these are pending for in-game confirmation, where applicable.
Targetable Pets and Traps
- Aphelios Sentry: 20
- Corki Package: 45 (same as pathfinding radius)
- Elise Spiderling: 1 (also pathfinding radius)
- Gangplank Powder Keg: 0 (also pathfinding radius)
- Heimerdinger small turret and Apex turret: 35
- Illaoi tentacle: 35 (same as pathfinding radius)
- Jhin Trap: 125
- Kalista Sentry: 10 (same as pathfinding radius)
- Kalista Dark Spear on the ground: 20 (same as pathfinding radius)
- Malzahar Voidling: 10
- Nidalee Trap: 50
- Rek'Sai Tunnel Entrance: 0 (same as pathfinding radius)
- Senna Mistwalker: 0 (same as pathfinding collision)
- Shaco Box: 50
- Teemo Mushroom Trap: 125
- Thresh Lantern: 45 (same as pathfinding radius)
- Yorick Ghoul: 1
- Yorick Maiden: 20
- Yorick Ghoul Wall: ?
- Zac Respawn Bloblet: 54.4 (same as pathfinding radius)
- Zyra Thresher and Spitter Plants: 20
Untargetable Pets
Other than for basic attacks of their own (if they have the ability), their size doesn't matter. Neither does pathfinding radius, as untargetability is like ghosting (pending for confirmation).
- Azir Sand Soldier: 0 (also pathfinding radius)
- Bard Meep: 50
- Jarvan Standard: 13.6 (also pathfinding radius)
- Kindred Wolf: 0 (also pathfinding radius)
- Kindred Camp Mark: 1 (also pathfinding radius)
- Skaarl: 80 (when running off to the nearest brush)
- Lissandra Ice Thrall: 1
- Maokai Sproutling: 48
- Nunu Snowball: 48
- Olaf Axe: 50
- Orianna Ball: 48
- Ornn Ram: 1 (same as pathfinding radius)
- Shen Spirit Sword: 1 (same as pathfinding radius)
- Skarner Spire: 1 (same as pathfinding radius)
- Syndra Sphere: 48
- Viktor Chaos Strorm: 48
- Zoe Spell drop: 0 (same as pathfinding radius)
- Zac's Goo: ?
- Zyra Seed: 54.4 (same as pathfinding radius)
Player-generated terrain
(these units are ghosting-proof)
Todo: check if Vayne, Poppy, Sion interact with pathfinding or gameplay collision radius of player-made terrain
- Anivia Ice Wall segment: 100 (same as pathfinding radius)
- Azir Emperor's Divide Soldier: 125 (also pathfinding radius)
- Jarvan Cataclysm wall segment: 95 (also pathfinding radius)
- Taliyah Weaver's Wall chunk: 150 (also pathfinding radius)
- Trundle Pillar of Ice: 150 (same as pathfinding radius)
- Yorick Ghoul Wall: ?
Other
General
- Turrets: 88.4
- All wards: 1
- All Jungle Plants: 80
- Twin Shadows: 50
Temple of Lily and Lotus (Nexus Blitz)
- Jungle Guardian ( Temple of Lily and Lotus): 100 (same as Daisy)
- Nexus unit: 250
- When walking, during Sudden Death: 200
- Loot Teemo: 55
- Loot Veigar: 55 (increased to 82.5 by an innate buff)
Legend of the Poro King
- The Poro King: 100
- Poro follower: 80
Removed Content
- Zz'Rot Portal: 90
- Voidspawns: 20
Size Modifiers
All current size modifiers are percentage increases/decreases of the units flat base value and 
stack additively.
They scale the unit's gameplay radius, model size and Selection Box.
Model size and Selection Box have a cap, while gameplay radius does not (pending for confirmation).
Neeko copys her ally's current size modifiers (only for model size? how does her gameplay radius interact? (PENDING FOR TEST)) and overrides her own (pending for confirmation) when using 
Inherent Glamour.
Champions
Innate
Thus far, 
Malphite and 
Zac are the only champions with the innate quality of constantly modifying their size.
- Their maximum size is increased by their current armor and bonus bonus health, respectively (up-to +35% for both).
- For Zac, his current size additionally fluctuates based on his current health percentage (-30% at 0% health, regardless of his increase from bonus health).
Size Increase
- Aatrox's World Ender: +5%
- Cho'Gath's Feast: +6/8/10% per stack (based on rank), capped at +100% (also grants explicitly increased attack range)
- Lulu's Wild Growth: +40%
- Mordekaiser's Realm of Death (self): +10%, grows over 0.25 seconds and shrinks over 0.25 seconds
- Nasus' Fury of the Sands: +30% (also grants explicitly increased attack range)
- Olaf's Ragnarok: +10%
- Renekton's Dominus: +20% (also grants explicitly increased attack range)
- Shyvana's Dragon's Descent: +0/8.5/16% (based on rank) (also grants explicitly increased attack range)
- Trundle's Subjugate (self): +18%, gained in steps over a duration
- Volibear's Stormbringer: +35%, grows over 1.25 seconds and shrinks over 0.5 seconds (also grants explicitly increased attack range)
- Zyra affected by Leona's Sunlight: +10% (hidden passive/easter egg)
Size Reduction
- Trundle's Subjugate (target): -9.9%, lost in steps over a duration
- Sona's Power Chord - Diminuendo (target): -8%
- Mordekaiser's Realm of Death (target): -10%, shrinks over 0.25, but grows instantly
- Urgot's Mercy (target): Minus a lot, lost in steps over a duration
Items
While the following items do not explicitly increase the champion's attack range, they do increase the champion's size - allowing them to reach targets further away from their current location:
- Elixir of Iron: +15%
- Gargoyle Stoneplate: +7%, or +25% instead if used while Stone Skin is active
- Maw of Malmortius: +10%
- Sterak's Gage: +25%
Other
- Hand of Baron: +30% to Melee and Siege Minions and +15% to Super Minions
- Practice Tool Command: Add bonus health to target; grants up to +100% size (added-health-to-size scaling PENDING FOR TEST)
Trivia
- Ivern is the first and only champion with 70 radius.
- Nobody knows why, exactly.[1]
- Trickster's Glass did not override the user's size modifiers with their target's, unlike Neeko's Inherent Glamour does today.
- Sentries (A removed small monster, two of which accompanied the Blue Sentinel) had a radius of 50.
- Cinderlings (A removed small monster, two of which accompanied the Red Brambleback) had a radius of 40.
- The immediately largest champion at the start of the game is Malphite due to his Granite Shield, with 82.368 radius (further increased by armor from runes).
Largest size currently reachable (Last updated V10.15) (Todo)
- Cho'Gath (80 radius) with
- Feast (+100%)
- Hugify Lulu (+40%)
- Elixir of Iron (+15%)
- Empowered Gargoyle Stoneplate (+25%)
- Sterak's Gage (+25%)
- Maw of Malmortius (+10%)
For a total of 315% base size = 252 unit radius.
This size is pending for confirmation, in case some soft cap/hard cap exists.
