Welcome to this insider's FAQ on bitcoin stock to flow. This guide explains the popular S2F model, how it works, why it matters, and its limitations in simple terms. By the end, you'll understand why this metric generates so much debate in the crypto community.

What is bitcoin stock to flow?

Bitcoin stock to flow (S2F) is a metric that measures how scarce an asset is by comparing its existing supply (stock) to its annual new production (flow). A higher S2F ratio means the asset takes more years to produce the current stock, indicating greater scarcity.

For bitcoin, the "stock" is the total number of coins already mined, while the "flow" is the number of new coins created each year. Because bitcoin's supply is capped at 21 million and issuance is cut in half roughly every four years, its S2F ratio increases over time.

How does the bitcoin stock to flow model work?

The bitcoin stock to flow model works by plotting the historical S2F ratio against bitcoin's market value, then fitting a power-law curve to show a long-term relationship between scarcity and price. Under this model, each halving reduces the flow, raising the S2F ratio and, in theory, pushing the price upward.

In practice, the model uses logarithmic regression to map past data. When a halving occurs, the annual flow halves, so the S2F ratio roughly doubles, which the model interprets as a strong upward price signal for the following months or years.

Who created the bitcoin stock to flow model and when?

The bitcoin stock to flow model was popularized by an anonymous quantitative analyst known as PlanB, who first shared it in March 2019. PlanB released a series of articles and tweets showing a tight correlation between bitcoin's S2F ratio and its price from 2009 onward.

He later added a "S2F cross asset" version that included gold and silver, arguing that bitcoin's scarcity would eventually drive its market cap toward and beyond that of precious metals. The model gained a large following and also drew heavy criticism from statisticians and market observers.

Why is bitcoin stock to flow important?

Bitcoin stock to flow is important because it offers a simple scarcity-based valuation framework that helps investors understand bitcoin's supply dynamics and long-term price cycles. The S2F ratio highlights how each halving makes bitcoin even harder to mine, which many see as a built-in store-of-value feature.

  • It quantifies bitcoin's "digital gold" narrative.
  • It provides a transparent, data-driven way to compare bitcoin with commodities like gold.
  • It gives long-term investors a benchmark for potential price appreciation after halvings.

What are the main criticisms of the bitcoin stock to flow model?

Critics argue that the bitcoin stock to flow model is statistically flawed, relies on limited data, and fails to account for demand-side shocks such as regulatory changes or macroeconomic events. The model's correlation does not prove causation, and its predictions have missed actual price swings, including the bear market after the 2021 peak.

Another key objection is that supply scarcity alone does not determine price; adoption, utility, competition, and market sentiment all play major roles. Some analyses have also shown that the S2F relationship breaks down when different time windows are used, making the model less robust than it appears.

How does bitcoin stock to flow compare to gold and silver?

Bitcoin's stock to flow ratio is much higher than gold or silver, meaning bitcoin is far scarcer in relative terms than these traditional precious metals. Gold has an estimated stock-to-flow ratio around 60-70, meaning it takes over 60 years of current mining to double the gold supply; bitcoin's ratio after the 2024 halving is in the hundreds.

Proponents see this as evidence that bitcoin could eventually challenge gold as a monetary asset. However, gold has thousands of years of established use, while bitcoin is a young digital network with a much smaller market cap and a shorter track record.

Can you use bitcoin stock to flow to predict future prices?

You can use bitcoin stock to flow as a rough long-term guide, but it should not be treated as a precise price predictor because it ignores market demand and real-world events. The model may give a sense of where bitcoin could trade if historical scarcity trends continue, but it has a poor track record for short-term timing.

Many investors combine S2F with on-chain metrics, technical analysis, and macro indicators to form a more balanced view. As with any model, bitcoin stock to flow is best used as one input among many, not as a standalone prediction tool.

What is the current bitcoin stock to flow ratio in 2026?

As of 2026, bitcoin's stock to flow ratio remains extremely high because the 2024 halving cut the annual new supply to about 164,000 BTC. With the total stock around 20 million BTC, the ratio is approximately 120, though the exact number changes every time a new block is mined.

To calculate it yourself, divide the current total bitcoin supply by the number of new bitcoins produced per year. Because the flow is fixed at 3.125 BTC per block until the next halving, the ratio will keep rising slowly even if price stays flat.

Final Thoughts

Bitcoin stock to flow is a fascinating and widely discussed model that connects scarcity, halving cycles, and long-term valuation. It has helped many newcomers understand why bitcoin's design makes it increasingly difficult to produce over time.

That said, the model is not a crystal ball. Its limitations and failures show that investment decisions should never rely on a single metric. Use S2F as an educational framework and combine it with other research before making any financial choices.

Whether you are a beginner or a seasoned investor, understanding the stock to flow concept will give you a solid foundation in bitcoin's monetary policy and the debates that shape its market narrative.