People often ask the wrong question.
The question is not: “What hashrate guarantees a block?”
The right question is: what hashrate gives me a reasonable chance within a given time?
There is no guarantee
Solo mining is probabilistic.
Even a massive miner can go unlucky for a while. A small miner can still hit a block early.
That is why there is no magic hashrate threshold. The network does not owe you a block just because your rig is fast.
The basic idea
Your chance depends on your share of total network hashrate.
Roughly:
your hashrate ÷ network hashrate
That gives you the odds for a single block interval. To estimate the chance over time, you also need:
- block time
- network difficulty
- how long you plan to mine
- whether the network changes quickly
What actually matters
Two miners with the same hashrate can have very different outcomes if they mine different coins.
Why?
- one coin may have a much smaller network
- one coin may have faster blocks
- one coin may have more stable difficulty
- one coin may be dominated by a few large miners
So the answer is always coin-specific.
A practical way to think about it
Ask these four questions:
- How much of the network do I control?
- How many blocks happen in my time window?
- Can I survive long variance?
- Is the node and hardware setup realistic for me?
If the answer to #3 is no, the hashrate is probably too small for solo mining to feel acceptable.
Examples of where to test
Use the calculator for the coin you actually want to mine:
The honest answer
There is no universal hashrate number.
The only useful answer is the one that combines your hardware, the current network, and your patience.
If your goal is a steady reward stream, solo mining is the wrong model. If your goal is a full block and you accept variance, then the real question becomes whether your odds are acceptable to you.