How far Bitcoin's market value has stretched from what the network paid for its coins. The red zone has historically marked tops; the green zone, generational lows.
Realized cap is roughly the average price everyone who owns Bitcoin actually paid for their coins. The Z-Score measures how far today's price has run above that. A small gap means Bitcoin is cheap versus what holders paid; a big gap means the market is stretched and euphoric - which has historically come right before the top.
Price has fallen back to about what holders paid. In past cycles this band marked the bottom - historically the strongest long-term buying zones.
A normal, healthy premium over holders' cost. Neither a screaming buy nor a warning - Bitcoin spends most of its time in this range.
Price is far above holders' cost and greed is peaking. Every past cycle top has printed in this band - historically a time for caution.
A slow, big-picture gauge - it moves over months, not days. Use it for context and position sizing, not for timing day-to-day trades. And because Bitcoin matures each cycle, recent peaks have come in lower than older ones.
It is an on-chain valuation gauge for Bitcoin. It compares three things: market cap (what the market is paying now), realized cap (what the whole network paid, valuing each coin at the price it last moved), and the standard deviation of market cap. The result is a single number that shows how stretched price is versus the network's own cost basis.
The formula is Z-Score = (Market Cap − Realized Cap) ÷ standard deviation of Market Cap. Realized cap is the sum of every coin valued at the price it last transacted, so it behaves like an aggregate cost basis that rarely falls. When market cap runs far above realized cap, the Z-Score climbs; when the two converge, it falls toward zero.
The red zone (Z above 7) has historically aligned with cycle tops, when buyers are deeply in profit and the market is overheated. The green zone (Z below 0.1) has historically aligned with cycle bottoms, when market cap falls to or below realized cap and the average holder is barely in profit. The zones are guides drawn from past cycles, not guarantees.
Because Bitcoin is maturing. As market cap grows, the same dollar inflows move price less, so each cycle's Z-Score peak has tended to come in below the last. That is why a reading of 7 today is far more significant than a reading of 7 was in 2013.
Treat it as long-horizon context, not a timing tool. It can stay overheated or undervalued for a long time, and the thresholds are based on a small number of past cycles. Combine it with other signals and your own research. This page is general information only and not financial advice - see our Disclaimer.