| Attributes |
| Health | Damage | Tears | Range | Shot Speed | Speed | Luck | Hidden Attributes |
Luck affects a variety of chance-based effects and is represented by a 3-leaf clover.
Effects of luck
Luck influences many different elements:
- Room drops: For calculating room drops, luck is capped between 0 and 10, with higher luck not only resulting in higher amounts of drops but also higher quality drops such as chests.
- Room drop rates are otherwise identical in Normal and Hard game modes, but Hard mode removes 65% of heart type drops, replacing them with nothing.
- Tear effect chance: The chance of shooting tears with status effects becomes more likely as Luck goes up. This scales up to 100% chance per tear in most cases with enough Luck.
- Most of the status inflicting effects require a very unlikely high number of Luck to activate on every tear.
- Since these effects persist on the enemies for a set amount of time regardless of the Tears stat, a fast rate of fire is often enough to affect an enemy indefinitely.
- Most of the status inflicting effects require a very unlikely high number of Luck to activate on every tear.
- Tear items affected by Luck are:
Abaddon (Tears cause fear) - 100% at 85 Luck
Apple! (Razor tears) - 100% at 14 Luck- Ball of Tar (Tears slow enemies) - 100% at 18 Luck
- The Common Cold (Poison tears) - 100% at 12 Luck
- Dark Matter (Tears cause fear) - 100% at 20 Luck
- Euthanasia (Needle tears) - 100% at 15 Luck
- Evil Eye (Eye tears) - Slight increase with high Luck
- Fire Mind (Chance that tears explode) - 100% at 13 Luck
- Holy Light (Tears inflict Crack the Sky effect) - Maximizes at 50% at 9 Luck
- Iron Bar (Tears confuse enemies) - 100% at 27 Luck
- Little Horn (Instant death tears) - Slight increase with high Luck
- Loki's Horns (4-way tears) - 100% at 7 Luck
- Mom's Contacts (Tears petrify enemies) - Maximizes at 50% with less than 20 Luck
- Mom's Eye (Forwards and backwards tears) - 100% at 2 Luck
- Mom's Eyeshadow (Tears charm enemies) - 100% at 27 Luck
- Mom's Perfume (Tears cause fear) - 100% at 85 Luck
- Mom's Wig (Spawn blue spiders while shooting) - 100% at 10 Luck
- Parasitoid (Egg tears) - Maximizes at 50% with around 20 Luck
- Spider Bite (Tears slow enemies) - 100% at 15 Luck
- Tough Love (Teeth instead of tears) - 100% at 9 Luck
- Tear items affected by Luck are:
- Trinkets affected by Luck are:
- Black Tooth (Poisonous double damage tear) - 100% at 32 Luck
- Cain's Eye (The Compass effect) - 100% at 3 Luck
- Cartridge (The Gamekid effect when hit) - 100% at 38 Luck
- Eve's Bird Foot (Spawn a dead bird on killing an enemy) - 100% at 8 Luck
- Isaac's Fork (Heal half a heart on clearing a room) - 100% at 18 Luck
- A Missing Page (The Necronomicon effect) - Maximizes at 50% with 50-60 Luck
- Ouroboros Worm (Chance to shoot homing tears) - 100% at 9 Luck
- Pinky Eye (Poison tears) - 100% at 18 Luck
- Push Pin (Spectral + Piercing tears) - 100% at 18 Luck
- Red Patch (+1.8 Damage Up on taking damage) - 100% at 8 Luck
- Samson's Lock (Chance for +0.5 Damage Up on killing an enemy) - 100% at 10 Luck
- Trinkets affected by Luck are:
- Other items affected by Luck include:
- Broken Modem: Higher luck increases the rate of freezing enemies and their shots.
- Celtic Cross: The Celtic Cross grants its invulnerability more often with higher Luck, topping out at 100% at 27 Luck.
- Gimpy: The Soul Heart/Black Heart drop chance upon taking damage increases with higher Luck, topping out at 50% at 22 Luck.
- Midas' Touch: Poops generated by Isaac's actions have a chance to turn into Golden Poop, starting at 10% with 0 Luck up to 100% at 18 Luck.
- Mystery Gift: Higher luck results in a lower chance of getting The Poop or A Lump of Coal.
- Old Bandage: The Red Heart drop chance when you take a hit increases with higher Luck, topping out at 50% at 29 Luck.
- Virgo: The shield activation chance increases with Luck, topping out at 100% at 10 Luck.
- Other items affected by Luck include:
However, Luck doesn't affect:
- fortune teller, Portable Slot, shell game, slot machine: Their chance of giving a consumable don't increase with Luck. Only Lucky Foot increases the winning chances with these machines.
- The activation chance of: Fanny Pack, Dry Baby, The Mulligan, Broken Watch, Infamy, Tech.5, Guppy's Collar, Undefined (for I AM ERROR or black market teleports), We Need To Go Deeper! (for Crawl Spaces), Pandora's Box (as its effects are predetermined depending on which floor it's used on), and Missing Page 2.
- Content from Chests, Pots, Mushrooms, Skulls, Blue Fires, Purple Fires, Devil rooms, and angel rooms.
- Beggars, Devil beggars, key masters, and bomb bums aren't affected by Luck.
Items that affect luck
Activated Items
Passive Items
Trinkets
Other
- "Luck Up" pills increase luck by 1, and "Luck Down" pills decrease luck by 1.
- Lucky pennies increase luck by 1.
- In co-op, Green Baby will occasionally briefly increase luck by 2. Dark Baby will occasionally briefly increase all stats, including luck.
 The Binding of Isaac: Rebirth
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