$  python app.py
DAU (Daily Active Users): 1000000
Requests per user: 5
Size for request (kb): 20
Reads vs Writes (e.g.: 9:1): 9:1
Replication factor: 2

Capacity plan

Requests:
1000000 * 5 = 5000000 requests per day
1000000 * 5 = 50.0rps

Writes:
50.0rps / 10 * 1 = 5.0rps

Reads:
50.0rps / 10 * 9 = 45.0rps

Bandwidth:
50.0rps * 20kb = 1000.0kb/s
or
1.0mb/s

Storage:
Storage for second: 0.2mb
Storage for day: 20.0gb
Storage for year: 7.3tb
Storage in 5 years: 36.5tb

Thank you for use the capacity-plan-calculator.py