Register each batch on the Flocks tab — type, breed, date placed and how many birds — and deaths, birds sold and birds remaining roll up on their own. Each day, log a line per flock on the Daily tab: eggs collected, deaths, birds sold, feed used and its cost. That's the whole routine.
The Dashboard shows your mortality % (deaths as a share of birds placed — watch it climb), eggs today and this month, and what feed is costing you. Set today's date to keep 'today' and 'this month' correct. Yellow cells for typing; every total is a locked formula. Opens in Excel or Google Sheets — update it from the coop on your phone.