Results update on their own as you change anything. Damage numbers come from seed data that can lag the live patch - cross-check anything surprising against the in-game tooltip.
Crit chance fills in from your items automatically - type a number to override it.
Only for things this calculator can't model on its own - a rune, a passive, a stat-granting ability. Leave them at 0 otherwise.
Add more than one to run the same combo against several targets at once.
Click a card below to add that cast to the end of your combo. Click it twice to cast it twice. Everything resolves in the order shown, and auto-attacks carry your item on-hit effects automatically.
Pick a champion above to load their abilities.
Saved in this browser, per champion, so you only have to build a combo once.
Pick a champion, pick a defender, then add at least one step to your combo.
Pick candidate items to see which one adds the most damage to this exact combo against Defender 1, on top of the items already equipped above.