Welcome to the essential FAQ on Bitcoin's stock-to-flow model. This guide simplifies the concept, explains how it works, and discusses its implications for Bitcoin's price, all in beginner-friendly language.

What is Bitcoin stock to flow?

The Bitcoin stock-to-flow (S2F) model is a way to measure the scarcity of Bitcoin by comparing its existing supply (stock) to its newly created supply (flow).

In simple terms, stock is the total number of Bitcoins that have ever been mined, and flow is the number of new Bitcoins produced each year. A higher ratio means the asset is scarcer, which in theory could lead to higher value. For Bitcoin, this ratio increases over time because the block reward halves every four years, reducing the new supply.

How does the stock-to-flow model predict Bitcoin's price?

The stock-to-flow model predicts Bitcoin's price by assuming that scarcity drives value, much like gold or silver.

The model, popularized by an analyst known as PlanB, plots the historical stock-to-flow ratio against Bitcoin's market value. It suggests a strong correlation, implying that as scarcity increases, so does price. However, it's not a precise tool; it's more of a long-term trend indicator, not a short-term price predictor.

Why is stock to flow important for Bitcoin?

Stock to flow is important for Bitcoin because it quantifies its scarcity, which is a core feature of its value proposition.

Unlike fiat currencies that can be printed endlessly, Bitcoin's supply is capped at 21 million. The S2F model highlights how this fixed supply, combined with decreasing new issuance, makes Bitcoin increasingly scarce over time. This scarcity is often compared to precious metals, positioning Bitcoin as a potential store of value.

What is the current Bitcoin stock-to-flow ratio?

As of early 2026, the Bitcoin stock-to-flow ratio is approximately 56, based on the current supply and annual issuance.

To put that in perspective, gold has an S2F ratio around 60, making Bitcoin nearly as scarce. However, note that the exact number can vary slightly depending on the data source and the precise timing of block production. This ratio will continue to rise after each halving, increasing scarcity further.

How is Bitcoin's stock-to-flow ratio calculated?

Bitcoin's stock-to-flow ratio is calculated by dividing the total number of Bitcoins in existence by the number of new Bitcoins mined per year.

The formula is simple: S2F = Stock / Flow. For example, if there are 20 million Bitcoins in circulation and 200,000 are mined annually, the ratio is 100. The flow decreases by half every four years due to the halving, so the ratio grows as the stock increases and the flow shrinks.

What are the criticisms of the stock-to-flow model?

Critics argue that the stock-to-flow model is flawed because it oversimplifies Bitcoin's price drivers and has made inaccurate predictions.

Key criticisms include: it ignores demand factors, such as adoption and regulations; it assumes a direct relationship between scarcity and price, which may not hold; and it has failed to predict significant price drops. For instance, the model predicted a price of $100,000 by 2022, but Bitcoin fell short. Thus, it should be used with caution.

How does Bitcoin stock-to-flow compare to gold?

Bitcoin's stock-to-flow ratio is approaching that of gold, making it comparable in terms of scarcity.

Gold has an S2F ratio of about 60, while Bitcoin's is currently around 56. However, gold's supply increases at a steady rate, whereas Bitcoin's new supply is cut in half every four years. Over time, Bitcoin's S2F ratio will surpass gold's, making it even scarcer on a relative basis. This is why some investors view Bitcoin as a digital alternative to gold.

What is the future of Bitcoin stock-to-flow after the 2024 halving?

After the 2024 halving, Bitcoin's stock-to-flow ratio is expected to increase significantly, potentially doubling to around 112 by 2028.

The 2024 halving reduced the block reward from 6.25 to 3.125 BTC, cutting the annual flow roughly in half. With the stock continuing to grow, the ratio rises, reinforcing Bitcoin's scarcity narrative. While the model's predictions are speculative, the trend is clear: Bitcoin becomes more scarce over time, which could support its value as a store of wealth.

Final Thoughts

Bitcoin's stock-to-flow model is a fascinating tool that helps investors and enthusiasts understand the digital asset's scarcity. By comparing existing supply to new issuance, it provides a simple metric that highlights Bitcoin's deflationary nature.

However, it's not a crystal ball. The model has its critics and limitations, and price predictions should be taken with a grain of salt. For beginners, it's best to view S2F as one of many indicators, not the sole determinant of Bitcoin's future value. Always do your own research and consider multiple perspectives before making investment decisions.