How many total agents do I need?

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How many total agents do I need?
I'm already aware of Erlang C so I know how many people I need at each interval to maintain SL. What I can't figure out is how to extrapolate how many total agents I need (even after I apply shrinkage). For example (and I know averages aren't the way to go - this is just for illustrative purposes) if I need on avg 7 agents on Mon, 6 on Tue, 6 on Wed, 7 on Thu, 8 on Fri, 5 on Sat and 3 on Sun - how many total people do I need to fill that schedule and try to avoid overtime? We're open 12.5hrs M-F and 10hrs S-S. I don't know how to account for days off, lunch, and scheduled breaks. I think it's obvious I need more than just 8 people, but I simply don't know how many I need to hire (provided all my new hires last). Can you help me?

Create a schedule
The way to do this is to create a schedule. You can do this in a spreadsheet fairly easily. You need to match out your requirement by hour and then match a certain number of shifts against this until the totals match the staffing requirement.

So for example in a spreadsheet
Column A is the date/time of each hour/interval in the week
Column B is the staffing requirement
Column C id the total for columns D to Z
Column D is member of staff 1 - Put in a 1 for every hour/interval that member of staff would work
Column E is member of staff 2 - Put in a 1 for every hour/interval that member of staff would work
Column F is member of staff 3 - Put in a 1 for every hour/interval that member of staff would work
Column G is member of staff 4
Keep on adding columns for more people

You then make sure that every value in column C is higher than column B.

You would typically build lunch and scheduled breaks into Columns D to Z

In terms of days off etc, the easiest way to do this is to build this in to your shrinkage.
Here is an article on how to calculate it.
https://www.callcentrehelper.com/how-to-calculate-contact-centre-shrinkage-90353.htm

You then feed the shrinkage into an Erlang calculator to get the demand that you need.
https://www.callcentrehelper.com/tools/erlang-calculator/

Hope this helps