# PlanB's Bitcoin Stock-to-Flow Model Explained

**Published:** 2026-08-20T18:30:49.142Z  
**Topic:** Stock To Flow  
**Sentiment:** neutral  
**Publisher:** TrendWatcher — https://www.trendwatcher.in/article/d7d4bd87-0fa6-4191-bf5c-e1621daf0a77

The Stock-to-Flow (S2F) model, popularized by anonymous analyst PlanB, links Bitcoin's price to its scarcity. Learn how it works, its predictions, and key

The Stock-to-Flow (S2F) model, an economic framework traditionally applied to commodities like gold and silver, gained prominence in crypto markets after an anonymous Dutch institutional investor known as PlanB first applied it to Bitcoin in 2019 [1, 2]. The model attempts to quantify an asset's scarcity and project its value by comparing its total existing supply (stock) to its annual production (flow) [1].

| At a glance | |
|---|---|
| Model Creator | PlanB (anonymous Dutch institutional investor) [1] |
| Core Concept | Scarcity drives value, measured by stock-to-flow ratio [1] |
| Bitcoin Application | First applied in 2019, gained popularity during 2020-2021 bull market [1, 2] |
| Key Criticism | Ignores demand, macroeconomic factors, and has statistical flaws [1, 2] |

## Understanding the Stock-to-Flow Model

The S2F ratio is calculated by dividing an asset's total existing supply (stock) by its annual production (flow) [1]. A higher ratio indicates greater scarcity, which, according to the model, correlates with higher value [1]. For Bitcoin, the stock is its total circulating supply, and the flow is the number of new bitcoins created annually through mining [1, 2]. The model suggests that as Bitcoin's supply becomes more inelastic due to programmed halvings—events every four years that reduce miner rewards and thus new supply—its S2F ratio will increase, theoretically boosting its value [1, 2].

PlanB, known on X (formerly Twitter) as @100trillionUSD, developed an enhanced version called the Stock-to-Flow Cross Asset (S2FX) model [1]. This variant incorporates "clusters" representing different developmental phases of Bitcoin and includes market capitalization in its analysis, aiming to identify price phases and forecast future trends [1]. PlanB's S2FX calculations have estimated Bitcoin prices of approximately $350,000 by early 2027 and potentially over $1,000,000 after the 2028 halving [1].

## Criticisms and Limitations

Despite its popularity, especially during the 2020-2021 bull market when Bitcoin's price closely tracked its predictions, the S2F model has faced significant criticism [1, 2]. A primary limitation is its sole focus on supply, completely disregarding demand-side factors such as market sentiment, regulatory changes, interest rates, and geopolitical events, all of which can heavily influence Bitcoin's price [1, 2]. Critics also point to statistical flaws and an over-reliance on historical data, arguing that market structures evolve and past patterns may not reliably predict future movements [1, 2].

The model's predictions have deviated significantly from Bitcoin's actual price since late 2021, with some of PlanB's original S2F forecasts proving to be far above the actual market value in certain years [1, 2]. This has led many analysts to view S2F as a complementary tool for understanding scarcity rather than a precise forecasting instrument [1].

## What to watch

*   **Bitcoin Halving Events:** Monitor the impact of future halving events, which are programmed to reduce the "flow" of new Bitcoin and increase its S2F ratio [1, 2].
*   **Market Demand Shifts:** Observe significant shifts in Bitcoin demand, as the S2F model does not account for these, and they can independently influence price [1].
*   **Macroeconomic and Regulatory Developments:** Track broader macroeconomic trends and regulatory changes, which are external factors not incorporated into the S2F model but can heavily affect Bitcoin's valuation [1].

While the Stock-to-Flow model offers a framework for understanding how scarcity might influence Bitcoin's long-term value, its inability to account for demand and external market forces means it provides an incomplete picture of price dynamics [1, 2].

## Sources
1. Finst — [Who is PlanB and what is the Stock-to-Flow model?](https://finst.com/en/learn/articles/what-is-the-stock-to-flow-model)
2. CoinGecko — [Bitcoin Stock-to-Flow (S2F) Model Explained | CoinGecko](https://www.coingecko.com/learn/bitcoin-stock-to-flow-model-explained)

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Cite as: TrendWatcher, "PlanB's Bitcoin Stock-to-Flow Model Explained", https://www.trendwatcher.in/article/d7d4bd87-0fa6-4191-bf5c-e1621daf0a77