It was on the old Amazon forums. Found one of @joebcrafts posts:
This is the help page for FAQ about it:
Here is the link to the one here
https://test.sellersasksellers.com/t/the-magic-formula-behind-the-ahr-number/508/1
This is the most handmade sellers’ situation 
Some of us are around 200-250. But that’s about it, as far as I know.
Yea, I’m at 208 and have been ever since it started. I’m not Handmade (though most of my sales probably almost could qualify as such but it really isn’t artisan sort of work) but I’m low volume.
This thread has the discussion:
https://test.sellersasksellers.com/t/the-magic-formula-behind-the-ahr-number
Mine is an approximation since I ignore the fact that the scores only go up by 4s with every 200 sales.
That’s really good to know. So, for every 200 sales increase per month, we get our account health score bumps up by 4 points?
I wonder if the account health score would drop faster when your volume is high? I’m guessing yes.
It drops as the same rate of speed that follows the scale that @DDS posted.
Get a violation or a A to Z claim and it drops the day it happens.
Ours dropped the day we got an A to Z and back up the same amount the next day when we won the A to Z appeal.
It’s not per month, but per rating period, which is six months (180 days).
Every day, the new orders you process successfully are added to your order count total, and the orders from the oldest day of the date range fall off.
Once your total order count increases, or decreases, by 200 total orders, you gain, or lose, 4 points from your Account Health score.
I wonder if the account health score would drop faster when your volume is high? I’m guessing yes.
Whether you gain or lose points depends on how your newly added number of orders compares to your number of orders from six months ago dropping off.
For example, assume that the last 180 days (I’m ignoring that not all months have 30 days for simplicity’s sake) includes the range -
December 4 through June 4
Tomorrow, the range will shift to cover orders from Dec 5 through June 5. That means orders from Dec 4 will drop off and orders from June 5 will be added in.
If your total order count from Dec 4 through June 4 was 500, then the next day, your total count would be:
500 minus (number of orders from Dec 4 that fall off) plus (number of orders from June 5 that are added in)
That will give you a new total for the date range Dec 5 through June 5.
If you dropped 20 orders from Dec 4 and only gained 3 from June 5, then your new number would be 483 (500 - 20 + 3).
The total order count number changes every day but it doesn’t change your AHR score until/unless it passes one of the 200-multiple increments. In the above example, the user’s AHR score reflects 8 volume points, because their total order count is above 400 and below 600. They’ll continue to have 8 ‘volume points’ until their volume number either falls below 400 or moves above 600. As long as they stay in the 400 - 600 range, they’ll keep the same 8 volume points.
- If your total order count number is below 200, you get 0 volume points.
- If it’s between 200 and 400, you get 4 points.
- If it’s between 400 and 600 (as in the example), you get 8 points.
- Between 600 and 800, you get 12 points, etc.
What causes big swings in your AHR number is a substantial increase or decrease in current volume compared to what you were selling 6 months ago. In the example, the total order count moved by 17 in one day. If it continued to drop by 17 each day (most of us sell less in June than December), the total order count would fall below 400 in 5 days and the volume points awarded would drop from 8 to 4.
Thank you for explaining this 
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I’m trying to verify the business address and phone number. For address, they will send out a postcard but how about phone number? Someone here said that he gave Amazon a landline number. Did they actually call? Frankly I’m hesitating give out my cell phone number because I don’t want Amazon to post it publicly. Which number do you guys give to Amazon? How do they verify?
The address thing is annoying!
We uploaded Drivers license, bank statements, IRS Tax id & they all have the same address as the business address & the return address, etc.
And we have to do this every year!?
Yep, totally agree. I feel like Amazon employees don’t have enough work to do. Someone should suggest Mr Besoz for more lay off
The madness never ends…
Today I got the green check marks for phone and bank account, and clicked on the address bullet to get my card in the mail.
Then I went to the Tax ID bullet. When I verified a few months ago, they changed my business name to “53” and called it good. There was nowhere to edit this and there still is not. The box with that info is not clickable. So if I submit my documents, it will not match “53.” Nowhere in my Account Info is there a 53 to edit. Any suggestions? Should I submit the documents and pray?
We have a landline and it now has a green check. To our knowledge, we did not receive a call to verify. However, if they called and got the answering machine, they would have heard our message which answers with the company name. If they just hung up after hearing the message, we would not have known it was Amazon verifying.
Same thing happen to us last night …
Today the Business Address has a blue link which is 12 hours after we noticed it in the Account Info page.
Just keep checking … we have seen the system change and change again. At some point there will be access.
Or this one might be worth a contact to support or account health if some one (like perhaps a bot or person at Amazon) has accidentally changed a field. I know I saw comments from others that the state and city got swapped on them or that some people had Amazon go and change their Business name, address and phone number to the personal name address and phone number. Or go in and see if you can get into the tax interview to fix it?
Yes, I was one where Amazon changed my Business info to match my LEGAL info, without my input at all…my DBA is completely gone from the account currently…