Understanding your Global Cooldown (GCD) is essential for maximizing your DPS in Final Fantasy XIV. Whether you are a Black Mage looking for that perfect 2.19s cast or a Monk aiming for lightning-fast strikes, this calculator helps you determine your exact GCD based on your Skill Speed or Spell Speed stats.
How the FFXIV GCD Calculation Works
The Global Cooldown in FFXIV is not a simple linear reduction. It operates on a specific formula that involves "speed tiers." Because the game handles rounding in a specific way (using floor functions), increasing your Skill Speed by 1 point might not change your GCD at all, while the next point might drop it by 0.01 seconds.
The Mathematical Formula
The general formula used by the game's engine to calculate the speed modifier is:
- Speed Modifier:
1000 - floor(130 * (Stat - LevelMod) / DivMod) - Base Adjusted GCD:
floor(BaseGCD * Modifier / 1000) - Haste Adjustment:
floor(AdjustedGCD * (100 - Haste) / 100)
The result is then divided by 100 to give you the final value in seconds. This is why "BiS" (Best-in-Slot) gear sets are so focused on hitting specific stat thresholds—hitting a tier exactly ensures no stats are "wasted."
Skill Speed vs. Spell Speed
While both stats function similarly in terms of reducing the GCD, they apply to different types of actions:
- Skill Speed (SKS): Affects physical weaponskills and auto-attack damage. It also increases the damage of physical damage-over-time (DoT) effects.
- Spell Speed (SPS): Affects magic spells and casting times. It also increases the damage of magical DoT effects.
The Importance of "Comfy" GCDs
In high-end raiding, such as Savage or Ultimate content, players often refer to a "comfy" GCD. This refers to a speed that allows your rotation to align perfectly with your 60-second or 120-second burst windows. For example:
- Paladin: Usually prefers a 2.50s or 2.42s GCD to fit specific spells into their Request-a-cat window.
- Black Mage: Often stacks as much Spell Speed as possible, sometimes reaching GCDs under 2.20s to maximize the number of Fire IVs cast.
- Warrior: Generally prefers a slower GCD (2.50s) to avoid drifting their Inner Release window.
Optimizing your GCD isn't just about speed; it's about consistency. If your GCD is too fast, you might find yourself finishing your rotation before your big cooldowns are ready, leading to "drift" that can lose you significant damage over a 10-minute fight.