BTC: Mempool Backlog in Blocks

Bitcoin Mempool Backlog in Blocks was 33.28 blocks on 9 Nov 2026 (latest daily value).

How many default-size blocks the transactions waiting in our node's mempool would fill.

Why use it. A plain way to size the queue: this many blocks would have to pass, if nothing new arrived, for everything waiting to be mined. How to read it. One block holds about 999,000 vB of transactions and one arrives about every 10 minutes, so each block of backlog is about 10 minutes of space. Most of a large backlog can be transactions paying the minimum, which clear last; the fee page shows what the next blocks would pay now.

Calculation. Mean, over the period's samples of the node's mempool, of its size in virtual bytes / 999,000 (a block template of 3,996,000 weight units). The node's mempool is limited to 300 MB, which caps the reading in long congestion. From the snapshots our mempool collector takes of our own Bitcoin node's mempool, about once a minute, from 3 October 2026; no earlier values are reconstructed. One node's view: other nodes hold slightly different transactions, and a transaction that arrives and is mined between two snapshots is not observed.