The Bitcoin blockchain (pruned) will never grow bigger than a some hundreds of terabytes - since there is a finite number of Bitcoins, there is a theoretical maximum to how big the UTXO set can be.

Assuming 300 bytes for each UTXO definition, and each UTXO is 1 satoshi - 630 Petabytes. Of course in practice when you have addresses that hold hundreds or thousands of bitcoins, the size in practice will be much much smaller than the figure above.

submitted by /u/ThenAskMe
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source https://www.reddit.com/r/btc/comments/a7nt8a/the_bitcoin_blockchain_pruned_will_never_grow/