Best share checker
Work out how close your best share came to a block, and what that figure does and does not mean.
Your details
The highest share difficulty your miner has submitted. You’ll find it in your pool statistics or on your miner’s display.
Pre-filled with bitcoin as of the date checked. For bitcoin cash or another SHA-256 chain, enter that chain’s difficulty here.
Optional. Enter it and the tool works out average waiting times as well.
Bitcoin network difficulty checked on 27-08-2026
What it means
Enter your best share.
What a best share is not
A best share measures how much work you have done, not how far you have come. Every hash is a separate throw at the same odds; nothing accumulates. If you are at 40 per cent of the network difficulty, you are not 40 per cent of the way there — you are not on your way at all, because there is no way to be on.
What the figure does do: it is an honest measure of your total work, and so the only scoreboard solo miners have. Your best share climbs the longer you keep running. That is exactly what it is meant to do.
How this is worked out
The percentage is your share divided by the network difficulty. Rarity is 1 divided by your share: the chance that a single attempt at difficulty 1 produces this share or better. The waiting times are difficulty × 2³² divided by your hashrate — the standard formula for the expected time to a hash that meets a target.