Am I Haste Capped? [UI/Haste Calculator]

I get asked quite often if a particular party or buff combination is Haste-capped, which is usually right when we're about to engage a boss. I wanted to be able to answer this question on the fly in a reliable way, that doesn't look like napkin-math, and would dispel any doubt from folks who are just unsure. Anyway, so I decided to write this FFXI Haste Calculator:

URL: https://fel-ffxi.github.io/haste-calculator/

Here's a screenshot:


Most folks will only really care about the left-side (Magic Haste), because that's the first thing we think of when trying to make a party right? How do we cap Haste with the jobs/buffs that we have access to? etc etc. Also, Job Ability and Equipment Haste, do factor into the total Attack Speed/Attack Delay reduction calculation. There is also Dual Wield and Martial Arts as well, but I'll add that at a later time, along with the proper explanations.

Note: Just like in-game FFXI, I chose to present decimal percentages to users and and calculate combined Haste values using /1024 fractions underneath. All of the percentages and fractional values were taken from BGWiki. Claude did help me write this, but because this is my chosen profession, I'm confident that I can further refine and test whatever AI produces.

As usual, any and all feedback welcome. :)

2026/06/23 Edit: I added modifiers for Soul Voice, Bolster, BoG, EA and visual cards for Dual Wield and Martial Arts.

Can/Should add DW and MA

(blitzer's roll that no one uses)

just a minor nitpick, but it's "marcato" and not "mercato"

Thanks, I can't spell, apparently. xD

Might wanna add a drop down for Hasso +1~9%.

Hasso is 10% JA haste for all jobs.

For a Sam main job Hasso can go up to 17% with both Kasuga Haidate +3 (+3%) and Wakido Kote +3/+4 (+4%).

One of those pieces + capped magic haste caps delay reduction for Sam main job. Or both, and only need 39% magic haste to cap delay.

Great tool! Just missing Dual-Wield calculations.

Especially the ability to check off Dual Wield II for DNC sub or Dual Wield III for NIN sub

And of cause also DW gear.

If the tool had this included it would be perfect for calculations I would say.

URL: https://fel-ffxi.github.io/haste-calculator/

Update:
I added modifiers for Soul Voice, Bolster, BoG, EA and visual cards for Dual Wield and Martial Arts. I updated the screenshot in the first post as well.

I chose to separate the modifiers for Dual Wield and Martial Arts and made sure that they are mutually exclusive. We don't really have a lot to configure or choose in this regard. We basically can choose the job we want or the Tier of Dual Wield (or Martial Arts, mutually exclusive) that we happen to be playing with.

Please let me know if you think there's a better way that these two quantities can be displayed or if there is other information you'd like to see here.

I could provide a more human-friendly explanation of the performance benefits, like in this concrete explanation, which is admittedly, too verbose:

FFXIcalculator already does this, but it’s nice to have more options.
The inclusion of summaries is also pretty good.

Nicely done, very good tool and easy to use.

In the Dual Wield section, a slider for "Equipment DW %" would be useful. To check how the Total Haste is affected by adding some piece of equipment.

Thanks