Calculator Form
Use the responsive calculator grid below. It shows three columns on large screens, two on smaller screens, and one on mobile.
Example Data Table
| Stat Type | Speed | Base Recast (ms) | Haste % | Final GCD (s) |
|---|---|---|---|---|
| Skill Speed | 380 | 2500 | 0 | 2.50 |
| Skill Speed | 420 | 2500 | 0 | 2.49 |
| Skill Speed | 550 | 2500 | 0 | 2.48 |
| Spell Speed | 650 | 2500 | 0 | 2.47 |
Formula Used
Level 80 speed function:
f(SPD) = floor(130 × (SPD - 380) / 3300 + 1000)
Stage 1 recast:
GCD1 = floor((2000 - f(SPD)) × ActionDelay / 1000)
Adjustment stages:
GCD2 = floor((100 - TypeY) × (100 - Haste) / 100)
GCD3 = (100 - TypeZ) / 100
GCD4 = floor(ceil(GCD2 × GCD3) × GCD1 / 1000)
Final GCD = floor(GCD4 × AstralUmbral / 100) / 100
This page keeps the Shadowbringers level 80 constants inside the calculator so your tier checks stay consistent.
How to Use This Calculator
- Choose Skill Speed or Spell Speed.
- Enter your speed stat from gear, melds, and food.
- Set the base recast. A standard global cooldown starts at 2500 milliseconds.
- Add haste or other adjustment values only when needed.
- Press Calculate GCD to show results above the form.
- Review the next tier value, comparison table, and graph.
- Use the CSV or PDF buttons to save your results.
About This Shadowbringers GCD Calculator
Why GCD tiers matter
GCD tiers matter because small speed gains do not always change the final cooldown. Some stat points only move you closer to the next breakpoint. Other stat points give the full drop. This is why players often target exact tiers. A clean tier can improve burst timing. It can also smooth weaving and align raid windows better.
What this calculator checks
This calculator checks the Shadowbringers level 80 speed model. It starts with your selected speed stat. Then it applies the base recast value. After that, it handles haste and extra adjustment fields. The result section shows your final GCD. It also shows the speed function and per minute pacing. These extra numbers help you compare builds faster.
How to compare builds
Enter one main stat value first. Then add a short list of comparison values. The table will show each resulting cooldown. You can spot tier changes quickly. The delta column helps even more. Negative values mean a faster GCD than your current setup. Positive values mean a slower setup. This makes gear planning much easier.
When to use the extra inputs
Many players only need speed and base recast. That is fine for simple checks. The advanced fields exist for more detailed planning. Use haste when a buff changes your recast. Use the other percentage fields when your theorycraft notes call for them. The graph then shows how nearby stat changes affect your result. This gives you a faster way to study tier movement.
Frequently Asked Questions
1) Is this a greatest common divisor calculator?
No. This page treats GCD as global cooldown for Shadowbringers. It is built for FFXIV-style speed and recast checks, not integer divisor math.
2) Should I choose Skill Speed or Spell Speed?
Choose the stat that matches your action set. Weaponskill-focused jobs usually care about Skill Speed. Cast-focused jobs usually care about Spell Speed.
3) Why does my GCD not change after adding a few points?
Because Shadowbringers speed uses tiers. Many points move you within the same breakpoint. The GCD only drops when you cross the next tier.
4) What base recast should I enter?
Most standard checks use 2500 milliseconds. Enter a different value only when you are modeling another listed action delay or a custom theorycraft case.
5) What does the next tier speed mean?
It is the first higher speed value that produces a shorter final GCD under your current settings. It helps you judge whether more melds are worth it.
6) Why include Type Y, Type Z, and Astral or Umbral fields?
They support advanced adjustment cases. Many users can leave them at default values. They are there for detailed modeling when your notes or build plan require them.
7) What does the CSV export save?
It saves the comparison table rows. That makes it easy to review speed tiers later or paste them into a spreadsheet for gear planning.
8) What does the PDF export include?
The PDF export creates a compact report with your main inputs, key results, and comparison table. It is useful for sharing or keeping a quick local record.