LoL Build Sim — League of Legends Build Simulator

LoL Build Sim is an out-of-game simulator that lets you test League of Legends champion builds before you play. Freely combine champions, items, runes, and levels to inspect final stats, 1v1 damage, full combo output, effective HP, and DPS — all in real time. It's designed for post-patch build validation, helping new players learn item choices, and previewing matchups before ranked games.

Key Features

• 1v1 Damage Calculator: Place ally and enemy champions side by side to compare full-combo damage accounting for skills, auto attacks, and item actives in both directions.
• Full Item & Rune Coverage: Every completed item and rune (keystones through sub-runes) is supported, with stat effects auto-applied. Elixirs, stacking items, and lifeline shields are all included.
• Minion & Tower Damage: View minion tankiness and tower damage scaled to game time — useful for push decisions and tower-dive durability checks.
• Build Sharing: Share any build via URL. Browse and bookmark builds created by other players.

How to Use

Pick a champion on the blue and red sides, set level, items, and runes, and the center panel updates calculations in real time. Use the skill combo bar to adjust skill and AA counts for realistic damage figures. See theHow-to-Use guidefor detailed instructions and theFAQfor common questions.