Gem Levels: What Each Level Adds
Skill damage and mana cost at gem levels 1–40 · Path of Exile 2✓ Checked against game files · 0.5.5
+1 level, spell (from 20)
+13.8%
damage, e.g. Fireball
+3 levels, spell (from 20)
+46.9%
damage, e.g. Fireball
+1 level, attack (from 20)
+5%
attack damage, e.g. Boneshatter
+3 levels, attack (from 20)
+16%
attack damage, e.g. Boneshatter
Skill gems go to level 20 by experience; "+N to Level of … Skills" on gear takes them past it, up to 40. On a level 20 gem, +1 level is worth +13.8% damage for a spell (median of 67 spells) but only +5% attack damage for an attack (138 attacks); +3 levels: +46.9% vs +16%. Each level also raises the mana cost by about +10.3%. Patch 0.5.5, from the game files.
Every level against level 20
| Gem level | Spell damage | Attack damage | Mana cost |
|---|---|---|---|
 1 | ×0.03 | ×0.32 | ×0.09 |
| 5 | ×0.09 | ×0.46 | ×0.18 |
| 10 | ×0.24 | ×0.61 | ×0.34 |
| 15 | ×0.52 | ×0.78 | ×0.60 |
| 18 | ×0.77 | ×0.90 | ×0.82 |
 19 | ×0.88 | ×0.95 | ×0.91 |
 20 | ×1.00 | ×1.00 | ×1.00 |
 21 (+1) | ×1.14 | ×1.05 | ×1.10 |
| 22 (+2) | ×1.29 | ×1.10 | ×1.21 |
| 23 (+3) | ×1.47 | ×1.16 | ×1.34 |
| 24 (+4) | ×1.67 | ×1.22 | ×1.47 |
| 25 (+5) | ×1.89 | ×1.28 | ×1.62 |
| 26 (+6) | ×2.15 | ×1.34 | ×1.77 |
| 28 (+8) | ×2.77 | ×1.48 | ×2.13 |
| 30 (+10) | ×3.58 | ×1.63 | ×2.55 |
| 35 (+15) | ×6.87 | ×2.08 | ×3.96 |
| 40 (+20) | ×13.4 | ×2.66 | ×6.06 |
Medians over the skills that have each number: spells by their average hit, attacks by their attack damage as % of base (weapon damage is the rest). Mana cost from spells.
+1, +3 and +5 levels on a level 20 gem: 205 skills
| Skill | +1 | +3 | +5 | Mana at +3 |
|---|---|---|---|---|
 Living Bombspell | +15.9% | +55.6% | +108.8% | +34.1% |
 Untetherspell | +15.8% | +55.5% | +108.8% | — |
 Frostflame Novaspell | +15.8% | +55.2% | +108.4% | — |
 Elemental Stormspell | +15.1% | +52.1% | +100% | +25.5% |
 Bone Blastspell | +15% | +51.9% | +100.4% | — |
 Bone Cagespell | +15% | +51.7% | +100.1% | +33.7% |
 Lightning Conduitspell | +14.8% | +51.7% | +99.9% | +33.3% |
 Arctic Howlspell | +14.8% | +51.6% | +100% | +16.5% |
 Snapspell | +14.9% | +51.6% | +99.9% | +33.7% |
 Decomposespell | +15% | +51.6% | +100% | — |
 Cometspell | +14.9% | +51.6% | +100% | +34.1% |
 Bitter Deadspell | +14.8% | +51.6% | +99.9% | — |
 Harbinger of Madnessspell | +14.8% | +51.6% | +99.9% | — |
 Lightning Warpspell | +14.9% | +51.6% | +100.1% | +34.9% |
 Flameblastspell | +14.9% | +51.6% | +100% | — |
 Solar Orbspell | +14.8% | +51.5% | +99.8% | — |
 Hexblastspell | +14.9% | +51.5% | +100% | +33.9% |
 His Vile Intrusionspell | +14.8% | +51.5% | +99.8% | — |
 His Foul Emergencespell | +14.9% | +51.5% | +99.9% | — |
 Skyfallspell | +14.8% | +51.4% | +99.9% | — |
 Seismic Cryspell | +14.9% | +51.4% | +99.8% | +16.5% |
 Galvanic Fieldspell | +14.4% | +51.4% | +100.7% | — |
 Thunderstormspell | +14.1% | +51.1% | +98.9% | +33.3% |
 Frost Bombspell | +14.4% | +49.3% | +94.6% | +33.3% |
 Firestormspell | +14.4% | +49.3% | +95% | +34% |
 Grim Pillarsspell | +14.5% | +49.2% | +94.8% | — |
 Orb of Stormsspell | +14.2% | +48.5% | +94.2% | +33.3% |
 Entanglespell | +14% | +47.5% | +89.9% | +33.7% |
 Abyssal Pactspell | +13.4% | +47.1% | +89.1% | — |
 Arcspell | +13.8% | +47% | +89.4% | +34.6% |
 Arctic Armourspell | +13.8% | +47% | +89.7% | — |
 Icestormspell | +14.2% | +47% | +89.7% | +34.1% |
 Power Siphonspell | +13.8% | +46.9% | +89.4% | — |
 Chaos Boltspell | +13.7% | +46.9% | +89.5% | — |
 Ember Fusilladespell | +13.7% | +46.9% | +89.3% | +32.4% |
 Fireboltspell | +13.8% | +46.9% | +89.2% | — |
 Lightning Boltspell | +13.6% | +46.9% | +89.2% | — |
 Exsanguinatespell | +13.9% | +46.9% | +89.5% | — |
 His Winnowing Flamespell | +13.8% | +46.9% | +89.5% | — |
 His Scattering Calamityspell | +13.8% | +46.9% | +89.4% | — |
 Reapspell | +13.7% | +46.8% | +89.4% | — |
 Essence Drainspell | +13.7% | +46.8% | +89.4% | +33.3% |
 Valako's Chargespell | +13.7% | +46.8% | +89.4% | — |
 His Dark Horizonspell | +13.7% | +46.8% | +89.3% | — |
 Soulrendspell | +13.7% | +46.8% | +89% | — |
 Coiling Boltsspell | +13.8% | +46.8% | +89.4% | — |
 Unearthspell | +13.7% | +46.8% | +89.4% | +34.2% |
 Elemental Expressionspell | +13.6% | +46.7% | +89.3% | +35.9% |
 Volcanospell | +13.6% | +46.7% | +89.4% | — |
 Enervating Novaspell | +13.6% | +46.6% | +88.9% | — |
 Dark Pactspell | +13.4% | +46.3% | +89.3% | — |
 Eye of Winterspell | +13.1% | +44.4% | +83.8% | +33.3% |
 Ice Novaspell | +13.1% | +44.3% | +83.5% | +33.8% |
| Fireballspell | +12.9% | +44.1% | +83.4% | +33.7% |
 Thrashing Vinesspell | +12.7% | +44% | +83.3% | +33.6% |
 Frostboltspell | +12.8% | +43.9% | +83.3% | +33.9% |
 Freezing Shardsspell | +12.5% | +43.8% | +82.5% | — |
 Frost Wallspell | +12.8% | +42.8% | +80.3% | +34.2% |
 Midnight Zenithspell | +12.8% | +42.7% | +79.5% | — |
 Bonestormspell | +12.7% | +42.6% | +80.4% | — |
 Ball Lightningspell | +11.7% | +42.3% | +79.3% | +33.3% |
 Frost Dartsspell | +12.4% | +41.6% | +79.6% | +33.9% |
 Detonate Livingspell | +11.8% | +40.8% | +75% | — |
 Moment of Vulnerabilityspell | +11.8% | +40.8% | +75% | +11.1% |
 Sparkspell | +12.3% | +40.5% | +75.3% | +33.9% |
 Blood Huntattack | +10.3% | +33.3% | +61.3% | +25% |
 Detonate Deadspell | +8.8% | +28.1% | +50.4% | +33.3% |
 Herald of Thunderattack | +8.2% | +25.4% | +45.9% | — |
 Escape Shotattack | +7.9% | +25.3% | +45.3% | +25.7% |
 Molten Blastattack | +7.9% | +25.3% | +45.3% | +25% |
 Leap Slamattack | +7.8% | +25.2% | +45.2% | +24.7% |
 Thunderous Leapattack | +7.8% | +25.2% | +45.2% | +25% |
 Frozen Locusattack | +7.8% | +25.2% | +45.3% | +24.7% |
 Rampageattack | +7.8% | +25.2% | +45.1% | — |
 Spear of Solarisattack | +7.8% | +25.2% | +45.3% | +25.3% |
 Gas Grenadeattack | +8% | +25.2% | +45.4% | +25.6% |
 Whirling Assaultattack | +8% | +25.2% | +45.4% | +25.4% |
 Sunderattack | +7.8% | +25.1% | +45.2% | +25.5% |
 Cluster Grenadeattack | +7.8% | +25.1% | +45.1% | +25.3% |
 Molten Crashattack | +7.8% | +25.1% | +45.1% | +24.7% |
 Elemental Sunderingattack | +7.7% | +25.1% | +45.1% | +24% |
 Elemental Siphonattack | +7.7% | +25% | +45% | +24.6% |
 Smash to Smithereensattack | +7.7% | +25% | +45% | — |
 Conductive Runesattack | +7.8% | +25% | +45.1% | — |
 Flash Grenadeattack | +7.8% | +25% | +45.1% | +24.5% |
 Fragments Of The Pastattack | +7.8% | +25% | +45.1% | — |
 Oil Grenadeattack | +7.8% | +25% | +45.1% | +26.7% |
 Spearfieldattack | +7.8% | +25% | +45.1% | +25.6% |
 Tempest Bellattack | +7.8% | +25% | +45.1% | +25.5% |
 Explosive Grenadeattack | +7.7% | +24.9% | +45.1% | +25% |
 Herald of Iceattack | +7.7% | +24.8% | +45.1% | — |
 Flicker Strikeattack | +7.6% | +24.8% | +45% | +24.7% |
 Voltaic Grenadeattack | +7.6% | +24.8% | +45% | +26% |
 Cross Slashattack | +6.8% | +21.7% | +38.3% | +25.4% |
 Devourattack | +6.8% | +21.7% | +38.3% | +25.5% |
 Grenadeattack | +6.8% | +21.7% | +38.3% | — |
 Shield Wallattack | +6.8% | +21.7% | +38.3% | +25% |
 Wave of Frostattack | +6.8% | +21.7% | +38.3% | +25% |
 Armour Breakerattack | +6.6% | +21.5% | +38.1% | +23.7% |
 Chaotic Surgeattack | +6.6% | +21.5% | +38.1% | — |
 Crossbow Shotattack | +6.6% | +21.5% | +38.1% | — |
 Elemental Surgeattack | +6.6% | +21.5% | +38.1% | — |
 Gemini Surgeattack | +6.6% | +21.5% | +38.1% | — |
 Queen's Processionattack | +6.6% | +21.5% | +38.1% | — |
 Rain of Arrowsattack | +6.6% | +21.5% | +38.1% | +25.2% |
 Rakeattack | +6.6% | +21.5% | +38.1% | +25% |
 Vivid Stampedeattack | +6.6% | +21.5% | +38.1% | — |
 Ice Shotattack | +6.7% | +21.5% | +38.1% | +25% |
 Disengageattack | +6.5% | +21.4% | +38% | +25% |
 Righteous Descentattack | +6.8% | +21.4% | +38.1% | — |
 Maulattack | +6.6% | +21.4% | +37.9% | — |
 Detonating Arrowattack | +6.8% | +21.4% | +38% | — |
 Rolling Slamattack | +6.6% | +21.3% | +37.9% | +26% |
 Lightning Rodattack | +6.4% | +21.3% | +38.3% | +26.7% |
 Furious Slamattack | +6.3% | +21.3% | +37.8% | +24.6% |
 Supercharged Slamattack | +6.3% | +21.3% | +37.8% | — |
 Wind Serpent's Furyattack | +6.5% | +21.2% | +38% | +24.6% |
 Shattering Spiteattack | +6.6% | +21.2% | +38% | — |
 Gathering Stormattack | +6.7% | +21.1% | +37.9% | — |
 Flame Breathattack | +6.4% | +21.1% | +37.6% | — |
 Volatile Deadspell | +6.1% | +20.4% | +34.7% | — |
 Phantasmal Arrowattack | +4.8% | +16.1% | +29% | +27.5% |
 Stormcaller Arrowattack | +4.8% | +16.1% | +29% | +26% |
 Toxic Growthattack | +4.8% | +16.1% | +29% | +25.5% |
 Voltaic Barrierattack | +4.8% | +16.1% | +29% | — |
 Poisonburst Arrowattack | +5.1% | +16.1% | +27.7% | +26.3% |
 Rolling Magmaattack | +5% | +16.1% | +28% | +34.9% |
 Shockchain Arrowattack | +5% | +16.1% | +28% | +25% |
 Vine Arrowattack | +5% | +16.1% | +28% | +25.5% |
 Whirling Slashattack | +5% | +16.1% | +28% | +25.6% |
 Hollow Resonanceattack | +4.8% | +16% | +27.8% | — |
 Ice Strikeattack | +4.8% | +16% | +27.8% | +25% |
 Storm Lanceattack | +4.8% | +16% | +27.8% | +23.9% |
 Explosive Spearattack | +5.1% | +16% | +27.6% | +26.5% |
 Magnetic Salvoattack | +5.1% | +16% | +27.6% | +25.3% |
 Soaring Midnightattack | +5.1% | +16% | +27.6% | — |
 Tornado Shotattack | +5.1% | +16% | +27.6% | +26.1% |
 Fangs of Frostattack | +5.1% | +15.9% | +27.7% | +25% |
 Wind Blastattack | +4.9% | +15.8% | +27.5% | +25.4% |
 Wing Blastattack | +4.9% | +15.8% | +27.5% | +25.5% |
 Siphoning Strikeattack | +5.1% | +15.8% | +27.8% | +25.5% |
 Glacial Lanceattack | +5.2% | +15.8% | +27.7% | +25.5% |
 Forge Hammerattack | +5% | +15.8% | +27.6% | +26.7% |
 Crushing Fearattack | +5% | +15.7% | +27.7% | +23.8% |
 Lightning Spearattack | +5% | +15.7% | +27.7% | +23.9% |
 Perfect Strikeattack | +5% | +15.7% | +27.7% | — |
 Rendattack | +5% | +15.7% | +27.7% | — |
 Storm Waveattack | +5% | +15.7% | +27.7% | +25.9% |
 Whirlwind Lanceattack | +5% | +15.7% | +27.7% | +23.9% |
 Earthshatterattack | +5% | +15.7% | +27.9% | +25.5% |
 Ice Fragmentsattack | +5% | +15.7% | +27.9% | — |
 Tempest Flurryattack | +5% | +15.7% | +27.9% | +24.3% |
 Axe Slashattack | +4.8% | +15.7% | +27.6% | — |
| Boneshatterattack | +4.8% | +15.7% | +27.6% | +26.7% |
 Bow Shotattack | +4.8% | +15.7% | +27.6% | — |
 Claw Stabattack | +4.8% | +15.7% | +27.6% | — |
 Dagger Stabattack | +4.8% | +15.7% | +27.6% | — |
 Flail Strikeattack | +4.8% | +15.7% | +27.6% | — |
 Mace Strikeattack | +4.8% | +15.7% | +27.6% | — |
 Punchattack | +4.8% | +15.7% | +27.6% | — |
 Quarterstaff Strikeattack | +4.8% | +15.7% | +27.6% | — |
 Snipeattack | +4.8% | +15.7% | +27.6% | — |
 Spear Stabattack | +4.8% | +15.7% | +27.6% | — |
 Spinning Infernoattack | +4.8% | +15.7% | +27.6% | +24.8% |
 Sword Slashattack | +4.8% | +15.7% | +27.6% | — |
 Toxic Domainattack | +4.8% | +15.7% | +27.6% | +17% |
 Bursting Fen Toadattack | +5% | +15.7% | +27.6% | — |
 Cull The Weakattack | +5% | +15.7% | +27.4% | +23.8% |
 Killing Palmattack | +5% | +15.7% | +27.4% | +23.8% |
 Oil Barrageattack | +5% | +15.7% | +27.4% | — |
 Spear Throwattack | +4.9% | +15.6% | +27.7% | — |
 Electrocuting Arrowattack | +4.8% | +15.6% | +27.2% | +23.9% |
 Lightning Arrowattack | +4.8% | +15.6% | +27.2% | +27.5% |
 Primal Strikesattack | +4.8% | +15.6% | +27.2% | +26.3% |
 Staggering Palmattack | +4.8% | +15.6% | +27.2% | +25.5% |
 Shattering Palmattack | +5.5% | +15.6% | +27.5% | +25% |
 Falling Thunderattack | +4.8% | +15.6% | +27.5% | +25% |
 Spiral Volleyattack | +4.9% | +15.5% | +27.7% | +34.4% |
 Rapid Assaultattack | +5.1% | +15.4% | +28.2% | +24.6% |
 Freezing Salvoattack | +4.7% | +15.3% | +27.3% | +24.8% |
 Earthquakeattack | +4.8% | +15.2% | +27.2% | +26.8% |
 Glacial Cascadeattack | +4.8% | +15.2% | +27.2% | +25.4% |
 Lunar Assaultattack | +4.8% | +15.2% | +27.2% | +23.9% |
 Shredattack | +4.8% | +15.2% | +27.2% | — |
 Stampedeattack | +4.8% | +15.2% | +27.2% | +26.2% |
 Gas Arrowattack | +4.3% | +14.9% | +26.6% | +25.8% |
 Resonating Shieldattack | +4.3% | +14.9% | +26.6% | — |
 Shield Chargeattack | +4.3% | +14.9% | +26.6% | — |
 Twisterattack | +4.3% | +13.4% | +22.8% | +25% |
 Crackling Palmattack | +4.1% | +12.3% | +21.9% | — |
 Gelid Palmattack | +4.1% | +12.3% | +21.9% | — |
 Hollow Focusattack | +3.4% | +10.5% | +17.7% | — |
 Fury of the Mountainattack | +3.4% | +10.3% | +17.9% | — |
 Acidic Concoctionattack | +3.2% | +10.3% | +17.3% | — |
 Bleeding Concoctionattack | +3.2% | +10.3% | +17.3% | — |
 Explosive Concoctionattack | +3.2% | +10.3% | +17.3% | — |
 Fulminating Concoctionattack | +3.2% | +10.3% | +17.3% | — |
 Shattering Concoctionattack | +3.2% | +10.3% | +17.3% | — |
 Hammer of the Godsattack | +3.3% | +10.3% | +17.7% | +24.7% |
 Starborn Onslaughtattack | +3.6% | +10.2% | +18.1% | — |
 Volcanic Fissureattack | +3.6% | +10.2% | +18.1% | +26.8% |
 Vaulting Impactattack | +3.3% | +10.2% | +17.8% | +25.3% |
 Molten Showerattack | +3% | +9.8% | +17.4% | — |
 Detonate Minionattack | +0% | +0% | +0% | — |
 Kinetic Bashattack | +0% | +0% | +0% | — |
How it is worked out
Every skill's numbers at gem levels 1–40 from the game files: the average of its "Deals X to Y" line for spells, and attack damage as % of base (GrantedEffectStatSetsPerLevel.BaseMultiplier) for attacks; mana from GrantedEffectsPerLevel. +N levels = value at 20+N ÷ value at 20.
Assumptions
- The skill's first damage part; other parts usually scale the same way.
- An attack's weapon damage doesn't change with gem level, so +% attack damage is +% of the attack's damage.
- No quality; levels above 20 need "+N to Level" modifiers (the game's gem level cap is 40).