Ability haste in LoL: how cooldown reduction really works
Ability haste is the stat that makes your spells come back sooner. It replaced the old “% CDR” and, though it looks the same, it works very differently: no practical cap (the hard limit is 500) and no real diminishing returns on casts. Understanding it changes how you value mage, support and fighter items.
What it is and why it replaced “% CDR”
Before, cooldown reduction was a direct percentage capped at 40%: 40% CDR meant 40% less cooldown, and that was it. The problem was that it was confusing to add up and hit a wall. Ability haste fixes it with a clean formula: your cooldown is divided by (100 + haste) / 100. The stat stacks 1:1 across sources and its only hard limit is 500.
With 100 haste, a 10-second ability drops to 5. With 200, to 3.3. The chart shows the cooldown number flattening —from 100 to 200 it barely drops— and that’s why many think it “returns less” past a certain amount. It’s the visual trap of the curve.
But that reading is misleading, and the next section explains why: what matters isn’t how much the number drops, but how many more times you cast your ability.
cooldown efectivo = cooldown base × 100 / (100 + aceleración) Ability haste cuts cooldown with the formula CD × 100 / (100 + haste): 100 haste = half the cooldown. The cooldown number flattens (from 100 to 200 it barely drops), but watch out: CASTS per minute rise in a straight line. That’s why, unlike the old “% CDR” capped at 40%, ability haste has no real diminishing returns: every point adds the same extra casts.
Why it has no diminishing returns (in casts)
Here’s the trick almost no one sees. If instead of looking at the cooldown you look at casts per minute, the formula flips and becomes a straight line: every point of haste adds exactly the same amount of damage-over-time. Up to the 500 cap there’s no wall and no real diminishing returns on casts.
Example: a 10s ability with no haste is cast 6 times per minute. With 100 haste, 12 times (double). With 200, 18 times (triple). Every 100 points adds 6 casts, always. The cooldown “flattens” but your total damage doesn’t: that’s why champions who rely on spamming abilities love stacking haste.
The practical lesson: don’t fear “overshooting” on haste the way you did with CDR (the 500 cap is almost never reached in a normal game). As long as your abilities are your main source of damage or utility, every point still counts. Test your real rotation in the Build Lab and compare builds in Versus.
lanzamientos por minuto = 60 / cooldown efectivo = (60 / cd base) × (1 + aceleración/100) Where to get it and how much it’s worth
Ability haste comes from items (many mage, support and fighter legendaries carry it), from runes (the Sorcery tree with Transcendence, for example) and from Ionian Boots of Lucidity. There’s a sibling stat, summoner and item haste, that reduces the cooldown of your summoner spells and actives —it’s separate and doesn’t affect your abilities.
In gold, haste is a cheap stat per point compared to raw damage (the chart above places it). That makes it very efficient when your damage already comes from abilities: you add more rotations for almost no budget.
Rule of thumb: if you cast spells often, haste pays off; if your damage comes from auto-attacks (a crit marksman), you barely look at it. See each stat’s value in gold efficiency and build your rune page with the runes guide.
Computed with the engine’s gold table (the price of the basic item that gives the pure stat). 1 point costs:
FAQ
How much ability haste do I need for 50% less cooldown?
100 ability haste cuts the cooldown in half (a 10s ability becomes 5s). The formula is cooldown × 100 / (100 + haste): 50 haste gives 33% less, 200 gives 67% less. The hard cap is 500 (≈83% less), but it’s almost never reached in a game.
Does ability haste have a cap?
It has a hard cap of 500 (≈83% less cooldown), but in practice you almost never reach it: the real limit is how much is available across items and runes. The old “% CDR” had a low 40% cap, and ability haste replaced it precisely so stacking keeps paying off far higher.
How much is ability haste worth in gold?
About 31 gold per point. Watch out for a common myth: Glowing Mote costs 250 for 5 haste (looks like 50/point), but that component was intentionally added at low efficiency, so it overvalues the stat. A Rioter confirmed the real value is around 30. The community derived 31.25 via the Ornn method (masterwork items add exactly 1000 gold split among their upgradeable stats). That’s why we value haste at 31.25, not 50.
Are ability haste and summoner haste the same?
No. Ability haste reduces your spells’ cooldowns (Q, W, E, R). Summoner haste reduces your summoner spells (Flash, Ignite), and item haste your item actives. They’re separate stats and don’t mix.