Lol Ability Haste Calculator: Convert to CDR
Use this LoL Ability Haste Calculator to instantly convert your total Ability Haste into effective Cooldown Reduction (CDR), test different builds and find the perfect spell-uptime for your champion.
Accurate Ability Haste to CDR conversion for all current patch values. We keep the formula and numbers up to date so you can reliably optimize your builds.
Ability Haste vs. Cooldown Reduction
Ability Haste to CDR Conversion: The Formula
Old Cooldown Reduction (CDR) had a hard cap at 40%. Ability Haste works differently. There is no official hard cap and it scales with the following formula:
Effective CDR% = Ability Haste ÷ (Ability Haste + 100)
That means every point of Ability Haste gives you the same increase in spell casts over time, but the displayed percentage gets flatter the more you stack. This is why it feels like a "soft cap" even though technically there is none.
📊 Quick Conversion Examples
20 AH = 16.7% CDR
50 AH = 33.3% CDR
100 AH = 50% CDR
200 AH = 66.7% CDR
🎯 Why Use This Calculator?
See exact cooldown reduction instantly
Compare different item builds
Find optimal Ability Haste breakpoints
Plan your build path efficiently
Ability Haste to CDR Conversion Table
Here are the most important Ability Haste to CDR breakpoints that players aim for. Use this as a quick reference or verify your own numbers with the calculator above.
| Ability Haste | CDR % | 10s Cooldown Becomes | Practical Use Case |
|---|---|---|---|
| 10 AH | 9.1% | 9.1s | Single small item, minor early comfort |
| 20 AH | 16.7% | 8.3s | Standard first item spike for mages/fighters |
| 30 AH | 23.1% | 7.7s | Early-mid spike, noticeable on main abilities |
| 40 AH | 28.6% | 7.1s | Old "max CDR" feeling |
| 50 AH | 33.3% | 6.7s | Common mid-game target for most builds |
| 60 AH | 37.5% | 6.25s | Strong for spam mages and utility supports |
| 80 AH | 44.4% | 5.6s | High-spam setups, poke and engage comps |
| 100 AH | 50% | 5.0s | Abilities almost always available |
| 150 AH | 60% | 4.0s | Extreme haste, specific champion builds |
| 200 AH | 66.7% | 3.3s | Very niche builds, constant spell spam |
💡 The "10s Cooldown" column shows how a 10-second ability cooldown is reduced at each Ability Haste level.
Why Ability Haste Is So Important in League of Legends
Ability Haste (AH) directly controls how often you can cast abilities. For most mages, supports and ability-based bruisers, cooldowns matter more than raw AD or AP: more casts mean more damage, more shields and heals, and more crowd control in every fight.
Stacking Ability Haste correctly lets you:
- Use key abilities multiple times in the same skirmish or teamfight.
- Spam waveclear and poke without going completely OOM.
- Rotate cooldowns faster around dragons, baron and turret dives.
Think of Ability Haste as "how often can I press my buttons" rather than just a number on your item. This calculator turns that number into real cooldowns so you see the impact instantly.
Where Do You Get Ability Haste From?
Ability Haste comes from several different sources. Combining them properly is more important than blindly stacking every haste item you find.
| Source | Examples | Typical AH Amount |
|---|---|---|
| Items | Black Cleaver, Navori Quickblades, Cosmic Drive, Zhonya's (full list) | 10-30 AH per item |
| Runes | Transcendence, Cosmic Insight | 5-20 AH |
| Champion Abilities | Some champions gain AH from passives or ult upgrades | 5-40 AH (varies) |
| Elixirs | Elixir of Sorcery | 25 AH (temporary) |
| Dragon Souls | Cloud Drake Soul | Varies by soul type |
Recommended Ability Haste by Role & Champion Type
You don't always need 100+ Ability Haste. In many games, hitting a solid breakpoint is enough for your champion:
| Role / Champion Type | Target Ability Haste | Why? |
|---|---|---|
| Mid Lane Mages | 40-80 AH | Multiple ability rotations in teamfights, good waveclear uptime |
| AP Burst Assassins | 20-40 AH | Enough to cycle main combo, prioritize damage over spam |
| Enchanter Supports | 40-80 AH | Near-permanent shield/heal uptime for carries |
| Fighters / Bruisers | 20-50 AH | Gapcloser and defensive abilities always ready |
| Tank Engage | 20-40 AH | Engage tools and CC more frequently available |
| ADCs (Caster-focused) | 20-40 AH | More ability casts between auto-attacks (Ezreal, Lucian) |
💡 Pro Tip: Balance Your Stats. It's usually better to hit one or two clean haste breakpoints and then build damage or durability, instead of stacking only Ability Haste without a plan. A balanced build wins more games.
How to Use the LoL Ability Haste Calculator Effectively
The calculator is designed to replace guesswork with hard numbers. Here's a simple workflow:
- Enter your items, runes and buffs. Add every source of Ability Haste from your planned build.
- Check the total Ability Haste and CDR. See how it affects your main cooldowns.
- Test alternative builds. Swap one item or rune at a time and compare the difference.
- Lock in your breakpoint. Decide which Ability Haste value you want to reach this game.
Step 1: Gather Your AH Sources
Note all Ability Haste from your core items, runes and temporary buffs.
Step 2: Calculate & Analyze
Use the calculator to see your total Ability Haste and how much CDR you effectively gain.
Step 3: Optimize & Dominate
Adjust your build to hit the right breakpoint and keep your most important spells always ready.
FAQ: Ability Haste & CDR Questions
Is there a cap on Ability Haste in League of Legends?
No, there is no hard cap. Ability Haste itself does not have a fixed maximum. In practice, values above ~100-150 AH are very rare and usually overkill, but the stat continues to scale with the same formula infinitely.
What is considered "good" Ability Haste?
For most champions, reaching around 30-60 Ability Haste in mid-late game is a strong and realistic goal. Beyond that, only very specific kits really benefit from extreme spam builds.
How much is 100 Ability Haste to CDR?
100 Ability Haste = 50% CDR. This means your abilities have half their base cooldown. A 10-second ability becomes 5 seconds, a 100-second ultimate becomes 50 seconds.
Is Ability Haste better than raw damage stats?
It depends on your champion and role. If your kit relies on one or two high-impact spells, Ability Haste can easily outperform a small amount of extra AP or AD. If your damage mainly comes from auto attacks, you usually prioritize other stats first.
Does Ability Haste affect ultimate cooldowns?
Yes. Ability Haste reduces the cooldown of all abilities, including ultimates. Champions with strong teamfight ultimates often get huge value from just a few haste items.
What is the difference between CDR and Ability Haste?
Old CDR (pre-Season 11) was a percentage that capped at 40%. Ability Haste (current system) has no cap and uses the formula: CDR% = AH ÷ (AH + 100). This makes every point of AH give the same value in terms of casts per minute, but with diminishing percentage returns.