Attributes |
Health | Damage | Tears | Range | Shot Speed | Speed | Luck | Hidden Attributes |
Damage refers to the amount of damage each tear deals to enemies, and is represented by a sword. As damage increases, the size of the tears increases as well. However, tear size is not always a valid indication of how much damage your tears will do. Tears will grow and shrink when your damage changes, but tears of a certain size do not have a specific damage value, and two tears of the same size (in two different runs) are likely to have different damage values.
- Polyphemus is an example of an item that provides a very high Damage stat.
Effective Damage
The formula for damage is:
where:
- CharBaseDmg = The character's base damage multiplied by their multiplier,
- TotalDmgUps = the total of all regular damage ups collected (not including special exceptions or damage multipliers),
- FlatDmgUps = the total of all damage ups that are excluded from the above (for example, Curved Horn or Ipecac), and
- EffectiveDmg = the approximate damage that can be expected per tear, or per 'tick' when using Brimstone or Technology 2.
This formula makes most damage upgrades less potent the more that Isaac has. For example, a Pentagram on Isaac would make his total damage (1 * 1.2 + 1)^0.5 = 1.48 * 3.5 = 5.19. Another Pentagram increases this to 6.45 (a 1.26 increase instead of a 1.69 increase). The higher a character's base damage, the more effective damage ups will be for that character. Flat damage modifiers and special adjustments like Polyphemus or Sacred Heart happen after the main formula.
Character Modifier
The character base damage is defined by a base number and a multiplier.
- Eve†: 0.75 • 3.50 = 2.625
- Jacob: 1.00 * 2.75 = 2.75
- Isaac, Magdalene, Samson, Lazarus, Eden, Lilith, The Lost, Apollyon, The Soul, Bethany: 1.00 • 3.50 = 3.50
- ???: 1.05 • 3.50 = 3.675
- Esau: 1.00 * 3.75 = 3.75
- Keeper, Cain and Lazarus Risen: 1.20 • 3.50 = 4.20
- Judas: 1.35 • 3.50 = 4.725
- Azazel: 1.50 • 3.50 = 5.25
- The Forgotten: 1.50 • 3.50 = 5.25
- Dark Judas: 2 • 3.50 = 7.00
†: Whore of Babylon has the unique effect of increasing Eve's damage modifier from 0.75 to 1.00 when active. This does not apply to other characters, however.
Damage Multipliers
Some items multiply damage rather than simply adding to it. Damage multipliers do not simply multiply the character's damage once; the damage stat is constantly recalculated and the damage multipliers are multiplied with the end result. This means that if a character starts with 3.50 damage and gets a 2x multiplier, their effective damage will be 3.5*2 = 7.00. If an item that grants +1 damage is picked up, the character's effective damage will be 3.5*(1*1.2+1)^0.5*2 = 3.5*(2.2)^0.5*2 = 3.5*1.48*2 = 10.38, and not 7.00 + 1.
Most damage multipliers stack; for example, Proptosis and Eve's Mascara both provide a 2x multiplier; picking up both will give a total multiplier of 4x. The exception to this is the 1.5x damage multipliers provided by Cricket's Head, Magic Mushroom, and the combination of Blood of the Martyr and The Book of Belial. These multipliers do not stack; for example, picking up both Cricket's Head and Magic Mushroom will result in an overall 1.5x multiplier rather than the expected 2.25x.
Reverse Formula
Consequently, the reverse formula to determine your damage bonuses from the displayed value is
Items that affect damage
Activated Items
Name | ID | Icon | Quote | Description | Quality |
---|---|---|---|---|---|
Razor Blade | 5.100.126 | Feel my pain | Takes one Heart of health and grants +1.2 damage for the current room. Repeated uses in the same room only take half a heart. | 0 | |
The Book of Belial | 5.100.34 | Temporary DMG up | +2 damage for the current room. Passively guarantees a Devil Room or Angel Room will appear while held. +2 damage for the current room. Passively increases the chance of finding a Devil Room or Angel Room while held. |
2 | |
The Nail | 5.100.83 | Temporary demon form | Gives one Soul Heart. For the current room; +0.7 damage, -0.18 speed, Isaac breaks rocks and deals contact damage. Gives half a Black Heart. For the current room; +2 damage, -0.18 speed, Isaac breaks rocks and deals contact damage. |
2 | |
D8 | 5.100.406 | Reroll stats | Re-rolls Isaac's damage, tears, range, and speed. | 2 | |
Dataminer | 5.100.481 | 109 | Displaces enemy sprites for the current room, randomly increases one stat and decreases another. | 0 | |
Potato Peeler | 5.100.487 | A pound of flesh | Removes a Heart Container, increases damage and range, and grants a Cube of Meat. | 2 | |
Void | 5.100.477 | Consume | Consumes all pedestal items in the room. Active items will have their effects added to Void, and passive items will grant random stat upgrades. | 4 | |
Golden Razor | 5.100.555 | Pain from gain | Spends five Pennies to increase Isaac's damage by 1.2 for the current room. | 1 | |
Mega Mush | 5.100.625 | I'm a big boy now! | Gigantifies Isaac for 30 seconds, increasing damage and range while lowering tears, granting invulnerability, and allowing Isaac to crush enemies and obstacles he walks on. The effect persists between rooms. | 4 | |
Sulfur | 5.100.556 | Temporary demon form | Grants Brimstone for the current room. | 3 |
Passive Items
Name | ID | Icon | Quote | Description | Quality |
---|---|---|---|---|---|
A Lump of Coal | 5.100.132 | My Xmas present | The more distance tears travel, the more damage they will do. | 3 | |
Abaddon | 5.100.230 | Evil + DMG up + fear shot | +1.5 damage, +0.2 speed. Removes all Red Heart containers, grants six Black Hearts, and adds a chance to shoot fear tears. +1.5 damage, +0.2 speed. Grants two Black Hearts, converts all Red Heart Containers into Black Hearts, and adds a chance to shoot fear tears. |
3 | |
Blood Clot | 5.100.254 | DMG + range up | Tears fired from the left eye have +1 flat damage, +5 range, and +0.5 tear falling speed. Tears fired from the left eye have +1 flat damage and +2.75 range. |
2 | |
Blood of the Martyr | 5.100.7 | DMG up | +1 damage. Isaac shoots blood tears. | 3 | |
Bloody Lust | 5.100.157 | RAGE! | Increases Isaac's damage whenever he takes damage, up to six times. The bonus resets when entering a new floor. | 2 | |
Brimstone | 5.100.118 | Blood laser barrage | Tears are replaced by a laser beam that pierces through all enemies and obstacles in its path and deals high damage. Can only be fired after a short charge-up period. | 4 | |
Capricorn | 5.100.307 | All stats up | Adds 1 Red Heart Container, gives +0.5 Damage, +0.1 Speed, +1.5 Range, and -1.0 Tear Delay, and gives 1 Bomb, Penny, and Key. Adds 1 Red Heart Container, gives +0.5 Damage, +0.1 Speed, +0.75 Range, and +0.5 Fire Rate, and gives 1 Bomb, Penny, and Key. |
3 | |
Cat-o-nine-tails | 5.100.165 | Shot speed + damage up | +1 damage, +0.23 shot speed. | 3 | |
Ceremonial Robes | 5.100.216 | DMG + evil up | Grants 3 Black Hearts, and +1 damage. | 3 | |
Champion Belt | 5.100.208 | DMG + challenge up | +1 damage. Increases the chance of champion enemies appearing by 15%. | 3 | |
Chemical Peel | 5.100.154 | DMG up | Tears fired from the left eye have +2 flat damage. | 2 | |
Cricket's Head | 5.100.4 | DMG up | Increases Damage by 0.5, and increases damage multiplier by x1.5. | 4 | |
Dark Matter | 5.100.259 | DMG up + fear shot | +1 damage, adds a chance to shoot fear tears. | 3 | |
Death's Touch | 5.100.237 | Piercing shots + DMG up | +1.5 damage, -0.3 tears. Tears are replaced with large piercing scythes. | 3 | |
Eve's Mascara | 5.100.310 | DMG up, tears + shot speed down | Doubles damage, halves tears stat, and greatly reduces shot speed. Doubles damage, 0.66x tears multiplier, and greatly reduces shot speed. |
3 | |
Experimental Treatment | 5.100.240 | Some stats up, some stats down | Randomly increases and decreases some of Isaac's stats. Increases four random stats and decreases the other two. |
1 | |
Godhead | 5.100.331 | God tears | Grants homing tears with a damaging halo. +0.5 Damage, -0.3 Tears -0.3 Shot Speed, +0.8 Tear Falling Speed, and +1.2 Range. Grants homing tears with a damaging halo. +0.5 Damage, -0.3 Tears, and -0.3 Shot Speed. |
4 | |
Growth Hormones | 5.100.70 | Speed + DMG up | +1 damage, +0.4 speed. +1 damage, +0.2 speed. |
3 | |
Guillotine | 5.100.206 | DMG + tears up. An out-of-body experience! | Isaac's head is removed from his body and floats around him as an orbital. Gives +1 damage and grants -1 tear delay. Gives +1 damage and grants +0.5 fire rate. | 2 | |
Ipecac | 5.100.149 | Explosive shots | Replaces tears with explosive and poisoning projectiles fired in an arc from the mouth. | 4 | |
Iron Bar | 5.100.201 | DMG up + concussive tears | +0.3 damage. Adds a chance to shoot concussive tears, causing enemies to walk around randomly. | 2 | |
Jesus Juice | 5.100.197 | Damage + range up | +0.5 damage, +0.25 range, +0.5 tear falling speed. +0.5 damage, +1.5 range. |
2 | |
Magic Mushroom | 5.100.12 | All stats up! | Makes Isaac bigger. Adds one Red Heart Container, +0.3 Damage, x1.5 damage multiplier, +5.25 / +2.5 Range, and +0.3 Speed, and restores all Health. | 4 | |
MEAT! | 5.100.193 | DMG + HP up | Grants one full Red Heart container, +0.3 damage. Heals 1 additional Red Heart | 2 | |
Missing No. | 5.100.258 | Syntax error | Randomizes all passive items and stats upon pickup and at the start of each succeeding floor. | 0 | |
Odd Mushroom | 5.100.121 | HP + DMG up, speed down | Grants one empty Heart container, +0.3 damage, +0.25 range, +0.5 tear falling speed, and -0.1 speed. Grants one full Heart container, +1 damage, +1.5 range, and -0.2 speed |
2 | |
Odd Mushroom | 5.100.120 | Tears + speed up, DMG down | +1.7 tears, +0.3 speed, slightly reduces damage. | 2 | |
Pentagram | 5.100.51 | DMG up | +1 damage, increases Devil Room / Angel Room chance by 10%. | 3 | |
Polyphemus | 5.100.169 | Mega tears | Isaac fires huge tears that deal massive damage, but fire rate is greatly decreased. If a tear kills an enemy, it travels on with any leftover damage. | 4 | |
Proptosis | 5.100.261 | Short range mega tears | Tears start out massive with high damage, and then shrink down and become weaker over a short range. | 3 | |
Sacred Heart | 5.100.182 | Homing shots + DMG up | Adds a Red Heart Container. Grants homing tears, a x2.3 Damage multiplier, +1 flat Damage, -0.4 Tears, -0.25 Shot Speed, and +4.125 Range. Adds a Red Heart Container. Grants homing tears, a x2.3 Damage multiplier, +1 flat Damage, -0.4 Tears, and -0.25 Shot Speed. |
4 | |
SMB Super Fan | 5.100.189 | All stats up | +1 Red Heart container, +0.3 damage, +0.2 tears, +0.2 speed, +0.5 range, +1 tear falling speed. Fully restores all red hearts. +1 Red Heart container, +0.3 damage, +0.2 tears, +0.2 speed, +2.5 range. Fully restores all red hearts. |
3 | |
Soy Milk | 5.100.330 | DMG down + tears way up | Tears are smaller and do much less damage, but fire in very rapid succession. | 2 | |
Steven | 5.100.50 | DMG up | +1 damage. | 3 | |
Stigmata | 5.100.138 | DMG + HP up | +0.3 damage, grants one full Red Heart container. Heals 1 additional Red Heart. | 2 | |
Synthoil | 5.100.345 | DMG + range up | +1 damage, +5.25 range, +0.5 tear falling speed. +1 damage, +2.5 range. |
3 | |
Technology 2 | 5.100.152 | Extra laser | Replaces the tears fired from Isaac's right eye with a rapid-firing low damage piercing laser. Damage down. | 2 | |
The Halo | 5.100.101 | All stats up | Grants one full Red Heart container, +0.3 damage, +0.2 tears, +0.25 range, +0.3 speed, and +0.5 tear falling speed. Grants one full Red Heart container, +0.3 damage, +0.2 tears, +1.5 range, and +0.3 speed. Heals 1 additional Red Heart. |
2 | |
The Mark | 5.100.79 | DMG + speed up | Grants one Soul Heart, +1 damage, and +0.2 speed. Grants one Black Heart, +1 damage, and +0.2 speed. |
3 | |
The Pact | 5.100.80 | DMG + tears up | Grants two Soul Hearts, +0.5 damage, and +0.7 tears. Grants two Black Hearts, +0.5 damage, and +0.7 tears. |
3 | |
The Small Rock | 5.100.90 | DMG up + speed down | +1 damage, +0.2 tears, -0.2 speed. | 3 | |
Whore of Babylon | 5.100.122 | Curse up | Grants +1.5 Damage and +0.3 Speed whenever Isaac has a Half Red Heart or less. | 2 | |
8 Inch Nails | 5.100.359 | Stick it to 'em! | +1.5 damage. Replaces Isaac's tears with nails, which have increased knockback. | 3 | |
Crown Of Light | 5.100.415 | The untainted gain power | +2 Soul Hearts. While Isaac has no empty red hearts, grants 2x damage, increased range, and -0.3 shot speed. Regardless of health, the crown deactivates for the current room when Isaac takes damage. | 4 | |
Dead Eye | 5.100.373 | Accuracy brings power! | Isaac's damage increases each time an enemy is hit. Damage is reset upon missing a shot. | 3 | |
Lusty Blood | 5.100.411 | Their blood brings rage! | Isaac's damage increases for the current room each time he kills an enemy. | 3 | |
Maw Of The Void | 5.100.399 | Consume thy enemy! | Charged by firing for 2.5 seconds and when released, creates a black ring around Isaac that rapidly deals damage. +1 damage, the ring can cause enemies to drop Black Hearts. | 3 | |
Purity | 5.100.407 | Aura stat boost | Boosts one of Isaac's stats depending on the color of the aura around him. The aura disappears upon taking damage and reappears with a random color upon entering a new room. Red boosts damage, blue boosts tears, yellow boosts speed, and orange boosts range. | 3 | |
Adrenaline | 5.100.493 | Panic = power | Increases damage based on how many empty Red Heart containers Isaac has. | 2 | |
Bozo | 5.100.513 | Party time! | +0.1 flat damage, grants a Soul Heart. Enemies can randomly become briefly charmed or feared. Taking damage has a chance to spawn a Rainbow Poop. | 2 | |
Death's List | 5.100.530 | Just hope you're not next... | Grants a pickup or stat upgrade if all enemies in a room are killed in the order they are marked. | 2 | |
Dog Tooth | 5.100.445 | Bark at the moon! | +0.3 damage, +0.1 speed. Plays a howl or bark sound when entering a room with undiscovered Secret Rooms or Crawl Spaces. | 2 | |
Haemolacria | 5.100.531 | I'm seeing red... | Tears are now fired in an arc. Upon hitting the floor, an obstacle, or an enemy, they burst into many smaller tears in all directions. Increases tear delay. | 4 | |
Sulfuric Acid | 5.100.463 | Acid tears! | +0.3 damage. Adds a chance to fire acidic tears which can destroy obstacles and open doors. | 2 | |
Trisagion | 5.100.533 | Smite thy enemy | Tears are replaced with piercing white blasts of light that deal less damage but can damage the same enemy multiple times. | 3 | |
Almond Milk | 5.100.561 | DMG down + tears up + you feel nutty | Quadruples fire rate, with x0.3 damage multiplier. Each tear is a given random effect that alters its movement. | 1 | |
Binge Eater | 5.100.664 | All you can eat | +1 Red Heart Container and fully heals Isaac. Item pedestals also offer a random food item. Picking up a food item temporarily grants +3.6 damage and permanently boosts 2 stats. | 4 | |
Blood Oath | 5.100.569 | Bleed me dry | Stabs Isaac at the beginning of each floor, draining his Red Hearts. Increases damage and speed for the floor based on the amount drained. | 1 | |
Dogma | 5.100.633 | Ascended | Grants flight, +2 damage, and increases speed to 1.1. Grants enough health to have 6 full hearts, if possible. Grants the Holy Mantle effect for the room it was obtained in. Automatically given to Isaac after defeating Dogma. | 3 | |
Eye of the Occult | 5.100.572 | DMG up + range up + controlled tears | +1 damage, +2 range, -0.16 shot speed. Isaac's tears can be controlled mid-flight with tear controls. | 3 | |
Heartbreak | 5.100.694 | Eternal sorrow | Grants 3 broken hearts and +0.25 damage for every broken heart Isaac has. Every otherwise fatal hit will add 2 more until Isaac has nothing but broken hearts. | 3 | |
Immaculate Heart | 5.100.573 | Halo of tears | Adds one Red Heart Container and fully restores health. x1.2 damage multiplier. Isaac will occasionally fire extra tears that orbit around him. | 3 | |
Red Stew | 5.100.621 | Full HP + temporary DMG up | Refills all heart containers. Grants an enormous damage boost that wears off over time. | 2 | |
Redemption | 5.100.673 | Deliver me from evil | If Isaac enters a Devil Room, but leaves without taking/opening anything in it (including Black Hearts, etc.), he gets +1 Damage and a Soul Heart at the start of the next floor. | 2 | |
Sausage | 5.100.669 | All stats up | Adds a Red Heart Container, fully heals Isaac, and gives +0.2 Speed, +0.5 Damage, +0.5 Tears, +2.5 Range, +0.2 Shot Speed, and +1.0 Luck. Increases the chance of encountering a Devil Room, Angel Room, and/or Planetarium each by 6.9%. | 3 | |
Stapler | 5.100.708 | DMG up | +1 Damage. Prevents Isaac from firing tears from his left eye, like Cain. | 3 | |
Terra | 5.100.592 | Born to rock | +1 Damage. Replaces tears with rocks that deal variable damage, have increased knockback, and can destroy obstacles. | 3 |
Trinkets
Name | ID | Icon | Quote | Description |
---|---|---|---|---|
Curved Horn | 5.350.35 | DMG up | +2 flat damage. | |
Red Patch | 5.350.40 | Your rage grows | Grants a chance to gain +1.8 damage for the current room upon taking damage. | |
Samson's Lock | 5.350.58 | Your rage grows | 1/15 chance to gain +0.5 damage for the current room each time an enemy dies. | |
Black Feather | 5.350.80 | With darkness comes power | Increases Isaac's Damage for each 'evil' item or trinket he possesses. | |
Cracked Crown | 5.350.92 | Stat booster | Decreases Isaac's tear delay by 20%, and improves the effectiveness of his other stat upgrades by 33%. Improves the effectiveness of stat upgrades by 20%. | |
Dim Bulb | 5.350.101 | I think it's broken | Provides a boost to all stats when Isaac's active item is completely uncharged. | |
Vibrant Bulb | 5.350.100 | It needs power | Provides a boost to all stats when Isaac's active item is fully charged. |
Other
- In co-op, Rage Baby, Revenge Baby, and Belial Baby will occasionally briefly increase damage. Dark Baby will occasionally briefly increase all stats, including damage. Buddy Baby will occasionally briefly grant the Guillotine effect, which increases damage. Whore Baby will occasionally briefly grant the Whore of Babylon effect, which increases damage.
- III - The Empress activates the Whore of Babylon effect for the current room, which increases damage.
- XI - Strength activates the Magic Mushroom effect for the current room, which increases damage.
- XV - The Devil activates The Book of Belial effect for the current room, which increases damage.
- Black Rune consumes all pedestal items in the room and turns them into random stat upgrades. No effect on shop items.
- Huge Growth increases damage, range, and Isaac's size for the current room.
The Binding of Isaac: Rebirth |
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