How to estimate the projected size of entropy?

Formula:

Total entropy size = (Number of keys) x (Entropy size per key)

Table:

Key Size (byte) Entropy Size Per Key (byte)
16 22,120 (21.6 KiB)
32 (size of an AES-256 key) 22,440 (21.9 KiB)
64 23,080 (22.5 KiB)
128 24,280 (23.7 KiB)
256 26,680 (26.1 KiB)
512 31,200 (30.5 KiB)
1,024 (1 KiB) (1.0 KB) 39,600 (38.7 KiB)
2,048 (2 KiB) (2.0 KB) 55,080 (53.8 KiB)
4,096 (4 KiB) (4.1 KB) 83,560 (81.6 KiB)
32,768 (32 KiB) (32.8 KB) 423,480 (413.6 KiB)

Example 1:

To generate (or to sync) 100 of AES-256 keys, the entropy size will be

100 x 22,440 = 2,244,000 bytes = 2.1 MiB.

Example 2:

To generate (or to sync) 100 of 128-byte OTP keys, the entropy size will be

100 x 24,280 = 2,428,000 bytes = 2.3 MiB.

Example 3:

To generate (or to sync) 100 of AES-256 keys and 200 of 128-byte OTP keys, the entropy size will be

100 x 22,440 + 200 x 24,280 = 7,100,000 bytes = 6.8 MiB.

Example 4:

25 MiB entropy quota allows you to generate (or to sync)

25 * 1024 * 1024 / 22,440 = 1168 of AES-256 keys in total.