100 Ability Haste isn't 100% cooldown reduction, and 500 Ability Haste doesn't give you free spells. The stat is genuinely simple once you see the one formula behind it, and understanding it tells you exactly when the next haste item stops being worth buying.
League of Legends Guide
Ability Haste Explained
The Math, the Cap & the SourcesAbility Haste is the most misread stat in League. Players see 100 on their stat sheet and assume their cooldowns are halved, or they see 40 and think they're at the old cap, or they stack it to 200 expecting spells to come back twice as fast as they did at 100. None of those are right, and all of them come from the same place: haste doesn't work like the percentage stat it replaced.
The good news is that it's one formula, and once you've seen it you'll never have to guess again.
The Formula
Here it is. Everything else in this article follows from this one line.
Work an example. You have an ability with a 10 second base cooldown and 50 Ability Haste. Plug it in: 10 × 100 / 150, which is 6.67 seconds. That's a 33.3% reduction from 50 haste, not a 50% one.
The reason the numbers don't line up intuitively is that Ability Haste doesn't reduce your cooldown, it increases how many times you cast. 50 haste means you cast 50% more often in a given window. Casting 50% more often means each cast takes two thirds as long to come back, which is the 33.3% figure. Both statements describe the same thing, and the casting-rate one is the one worth carrying in your head.
The Reference Table
You don't need to do arithmetic mid-game. These are the values worth memorizing.
| Ability Haste | Effective CDR | A 10s ability becomes | Extra casts |
|---|---|---|---|
| 10 | 9.1% | 9.09s | +10% |
| 25 | 20% | 8.00s | +25% |
| 40 | 28.6% | 7.14s | +40% |
| 50 | 33.3% | 6.67s | +50% |
| 67 | 40.1% | 5.99s | +67% |
| 100 | 50% | 5.00s | +100% |
| 200 | 66.7% | 3.33s | +200% |
| 500 (the cap) | 83.3% | 1.67s | +500% |
The single most useful row is 67. Old cooldown reduction was capped at 40%, and a lot of build habits still date from that era. 67 Ability Haste is the point where you've matched the old cap. If you learned League before the change and your instinct says "40% is enough," the modern number you're reaching for is 67.
Why Riot Replaced Cooldown Reduction
Cooldown reduction was removed in the 2021 preseason, and the problem it had was the opposite of the one people assume.
Old CDR got stronger the more you had. Going from 0% to 10% CDR gave you about 11% more casts. Going from 30% to 40% gave you far more than that, because you were dividing by a smaller and smaller remaining fraction. The last ten points were worth several times the first ten. That's why the stat needed a hard 40% cap, and it's why CDR was miserable to balance: an item that felt fine on its own became a problem the moment it stacked with two others.
Ability Haste inverts the design. Every single point is worth exactly the same amount of extra casting as every other point. The first 10 haste and the hundredth 10 haste both give you 10% more casts. That's what lets Riot put haste on items across the whole cost range without a cap that everybody bumps into by three items.
Why It Never Falls Off (and Why It Looks Like It Does)
This is where most arguments about the stat come from, so it's worth being precise.
The casting rate is linear
Every point of haste always adds 1% more casts. Going from 100 to 110 haste gives you exactly as much additional casting as going from 0 to 10. In the sense that actually matters, haste never gets worse.
The percentage looks like it diminishes
Converted into CDR%, the returns shrink fast: 0 to 50 haste buys you 33 percentage points, while 50 to 100 buys only another 17. That's what makes people say haste falls off, and it's an artifact of the conversion, not of the stat.
Both are true at once
The two statements aren't in conflict, they're the same curve read from different ends. If you think in "how often do I get to press this," haste is linear. If you think in "how much shorter is the bar," it diminishes.
What actually limits haste
The real reason to stop buying haste isn't diminishing returns, it's opportunity cost. At some point another 20 haste on an ability you're already casting whenever it's up is worth less than damage or durability. That's a build decision, not a math one.
There's also a genuine hard cap: 500 Ability Haste, which works out to 83.3% cooldown reduction. Nothing gets you to zero cooldown, because the formula asymptotes rather than reaching it. In a normal game you'll never approach 500, so treat this as trivia rather than a build constraint.
The Separate Haste Pools
Not all haste applies to everything. There are several distinct pools. General Ability Haste is the one that touches every ability you have; Basic and Ultimate Haste add on top of it, but only for the abilities they name, and the item, summoner and trinket pools sit outside your abilities entirely. Buying the wrong one is a common and expensive mistake.
Ability Haste
The general one. Applies to all four of your champion's abilities, and it's what people mean when they say haste with no qualifier.
Basic Ability Haste
Applies only to Q, W and E. Your ultimate gets nothing from it, which matters a great deal on champions whose whole game plan is a low-cooldown ultimate.
Ultimate Haste
Applies only to R. Worth far more on a champion with a 100 second ultimate than on one with a 20 second ultimate, since it's a percentage of a much bigger number.
Item, Summoner and Trinket Haste
Three more separate pools, covering active item effects, summoner spells like Flash and Teleport, and your ward trinket. General Ability Haste does nothing for any of them.
Where Ability Haste Actually Comes From
Specific numbers move every patch, so treat these as the categories to look in rather than a shopping list to memorize. Check the item's tooltip in game for the current value.
Boots. Ionian Boots of Lucidity are the haste boots, and they're the cheapest meaningful chunk of the stat in the game. They also carry summoner spell haste, which is the real reason they show up on champions who want Flash back sooner.
Components. Kindlegem and Fiendish Codex are the two cheap components that carry haste, one on the health side and one on the ability power side. Buying either on an early back gets the stat working immediately, which is usually better than saving toward the finished item.
Legendary items. Haste is spread across all three damage profiles. On the ability power side, Cosmic Drive, Horizon Focus and the Archangel's Staff line all carry a substantial amount. On the attack damage side, Black Cleaver is the long-standing haste item. Enchanters get theirs from the Moonstone Renewer line. Several of the items added for the 2026 season carry haste as well, including Actualizer, Bandlepipes and Dusk and Dawn.
Runes. Transcendence in the Sorcery tree grants haste at level milestones, and there's an Ability Haste option in the stat shards. Jack of All Trades also contributes, though it was nerfed in Patch 26.15, so check its current value before building around it.
The map. Blue buff grants ability haste on top of its mana regeneration, which is a genuine reason for a mid laner to ask for it beyond the mana.
A practical rule. Haste is at its best on champions with short cooldowns they're already casting on cooldown, and on champions with a game-defining ultimate where Ultimate Haste specifically is the goal. It's at its worst on a champion whose damage comes from one big ability they're saving for a fight anyway, since casting it more often per minute doesn't help if the fights are two minutes apart.
Frequently Asked Questions
How does Ability Haste work in League of Legends?
Your new cooldown equals your base cooldown multiplied by 100, divided by 100 plus your Ability Haste. Rather than reducing cooldowns by a percentage, it increases how often you cast: every point of haste gives you 1% more casts in a given window.
How much cooldown reduction is 100 Ability Haste?
Exactly 50%. A 10 second ability becomes a 5 second ability, and you cast twice as often as you'd at zero haste. It isn't 100% cooldown reduction, which is the single most common misconception about the stat.
Is there a cap on Ability Haste?
Yes, 500 Ability Haste, which converts to 83.3% cooldown reduction. Cooldowns can never reach zero through haste because the formula approaches the limit without hitting it. In practice you'll never get close to the cap in a normal game.
Does Ability Haste have diminishing returns?
Not in the way that matters. Each point always adds the same 1% to your casting rate, so it's perfectly linear in casts. What shrinks is the cooldown reduction percentage it converts to, which is an artifact of the conversion rather than the stat losing value.
What's the Ability Haste equivalent of the old 40% CDR cap?
67 Ability Haste, which gives just over 40% cooldown reduction. If you learned your build habits before the 2021 preseason change, 67 is the number that matches the target you're used to aiming for.
Does Ability Haste affect summoner spells?
No. Summoner spells use a separate Summoner Spell Haste pool, and general Ability Haste does nothing for them. Ionian Boots of Lucidity are the main source of the summoner version, which is why they're the boots of choice for players who want Flash back sooner.
Why did Riot replace cooldown reduction with Ability Haste?
Old CDR scaled exponentially, so the last points were worth several times the first ones. That forced a hard 40% cap and made the stat difficult to place on items. Ability Haste makes every point worth the same amount of extra casting, which is why it can appear across the whole item range without a cap anybody actually reaches.
Still building to a haste number you picked up years ago? Tell us what you aim for and on which champion.
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