What Is Bitcoin’s Stock-to-Flow Model?

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The Bitcoin stock-to-flow model has captured widespread attention—especially due to its bold prediction of Bitcoin reaching AU$1 million per coin by 2025. Despite being a relatively new application in the digital asset space, the model has held surprising accuracy, with Bitcoin’s price closely tracking its projections for over a decade.

Originally designed for analyzing precious metals like gold and silver, the stock-to-flow framework finds renewed relevance in Bitcoin. As the world increasingly refers to Bitcoin as “digital gold,” its fixed supply cap of 21 million coins makes it uniquely suited for this scarcity-based valuation model. At its core, the concept is simple: as supply growth slows and demand increases, value rises.

This article explores the mechanics, significance, and implications of Bitcoin’s stock-to-flow model—breaking down why scarcity matters, how the model works, and what it means for Bitcoin’s future price.

Why Scarcity Drives Value

Scarcity is the foundation of value in economics. The stock-to-flow model hinges on this principle by measuring how difficult it is to increase the supply of an asset. When supply can’t easily respond to rising demand, prices naturally rise.

Consider traditional commodities. If corn prices surge, farmers plant more crops. Within a season or two, supply catches up, and prices stabilize. But precious metals like gold are different. Mining gold is slow, capital-intensive, and geographically limited. It can't be "planted" like corn.

According to economist Saifedean Ammous in The Bitcoin Standard, “It is this consistently low rate of supply of gold that is the fundamental reason it has maintained its monetary role throughout human history.”

Bitcoin was designed with this insight in mind. Satoshi Nakamoto envisioned a digital asset as scarce as gold—but with a revolutionary advantage: it can be instantly transferred across the globe via the internet. Unlike gold, Bitcoin’s supply is not only scarce—it’s mathematically guaranteed.

With a hard cap of 21 million coins, Bitcoin is the first asset in human history with a truly fixed supply. No central authority can inflate it. No government can print more. This scarcity makes Bitcoin a powerful store of value—especially in an era of digital finance and global uncertainty.

👉 Discover how digital scarcity is reshaping global finance and investment strategies.

Understanding the Stock-to-Flow Model

The stock-to-flow (S2F) ratio is a metric used to quantify an asset’s scarcity. It compares the total existing supply (stock) to the new supply produced annually (flow).

The Formula:

Stock-to-Flow = Total Existing Supply (Stock) / Annual New Production (Flow)

A higher ratio indicates greater scarcity—and historically, higher value.

Real-World Examples:

These ratios help explain why gold trades at AU$79,107 per kilogram**, while silver is priced at **AU$1,105 per kilogram.

The S2F model doesn’t just describe current value—it has predictive power. Assets with rising S2F ratios tend to appreciate as their scarcity intensifies.

Bitcoin’s Stock-to-Flow Ratio: Digital Scarcity in Action

The application of the stock-to-flow model to Bitcoin was popularized by PlanB, a pseudonymous analyst believed to be a Dutch institutional investor with deep expertise in quantitative finance. His research, published under the handle @100trillionUSD, applied historical Bitcoin price and supply data to project future valuations.

Let’s calculate Bitcoin’s current S2F ratio:

Bitcoin’s S2F ratio of 63 is already on par with gold (~66). And unlike gold, Bitcoin’s ratio is set to increase dramatically every four years.

This is due to Bitcoin halving events—pre-programmed reductions in block rewards that cut new supply in half approximately every four years:

With each halving, the flow decreases while stock remains high—causing the S2F ratio to climb. By 2140, no new Bitcoins will be mined. At that point, the flow will be zero—and the S2F ratio infinite.

This structural scarcity makes Bitcoin fundamentally different from any other asset class.

👉 See how halving events are shaping Bitcoin’s long-term scarcity and price trajectory.

Bitcoin Price Predictions Based on Stock-to-Flow

PlanB’s S2F model uses over ten years of Bitcoin price and supply data to project future valuations. While not a guarantee, the model has shown remarkable alignment with actual price movements—especially around halving cycles.

Key Predictions:

These projections are based on the idea that as Bitcoin becomes harder to produce, demand will outpace supply—driving prices upward.

However, it’s important to interpret the model with nuance. As Adam Back, CEO of Blockstream, noted:

“One should think about [PlanB's stock-to-flow] model like Moore's Law: it's just an observation and speculative projection an observed trend may continue.”

The S2F model doesn’t account for external factors like regulation, macroeconomic shifts, or technological disruptions. But it does highlight a powerful truth: Bitcoin’s value is rooted in predictable scarcity.

If adoption continues to grow—driven by institutional investment, remittance use cases, or monetary hedging—the price could follow or even exceed S2F projections.

Frequently Asked Questions (FAQ)

What is the stock-to-flow model?

The stock-to-flow model measures an asset’s scarcity by dividing its total existing supply (stock) by its annual new production (flow). A higher ratio suggests greater scarcity and potential for price appreciation.

Why is Bitcoin compared to gold?

Bitcoin is often called “digital gold” because of its limited supply (21 million coins), durability, portability, and resistance to inflation—mirroring gold’s properties but with added benefits like instant global transferability.

How does Bitcoin halving affect stock-to-flow?

Each halving reduces the number of new Bitcoins created per block by 50%, decreasing annual supply (flow). This causes the stock-to-flow ratio to rise sharply, increasing scarcity and potentially driving up price.

Is the stock-to-flow model reliable for Bitcoin?

While not foolproof, the model has accurately tracked Bitcoin’s price trends over multiple cycles. It works best as a long-term valuation framework rather than a short-term trading tool.

Can Bitcoin’s price go to zero?

Theoretically yes—if adoption fails or critical flaws emerge. But with growing institutional ownership, regulatory clarity, and integration into financial infrastructure, many analysts view Bitcoin as increasingly resilient.

Does stock-to-flow apply to other cryptocurrencies?

Most altcoins lack Bitcoin’s predictable issuance schedule and strong network effects. While some projects mimic scarcity, none match Bitcoin’s combination of decentralization, security, and fixed supply—making S2F less applicable elsewhere.

👉 Explore real-time data and analytics that power next-generation crypto investment decisions.

Final Thoughts: Scarcity as a Catalyst

The stock-to-flow model offers a compelling lens through which to view Bitcoin’s long-term potential. It transforms abstract concepts like “digital scarcity” into measurable economic indicators.

While no model can perfectly predict market behavior, the S2F framework underscores a fundamental truth: when demand grows and supply is constrained, value follows.

Bitcoin’s fixed supply, combined with increasing global adoption, positions it uniquely in the financial landscape. Whether or not it hits AU$1 million by 2025, the underlying mechanics of scarcity ensure that Bitcoin will remain a focal point for investors seeking durable value in a digital world.

As we move deeper into the era of decentralized finance, understanding models like stock-to-flow isn’t just academic—it’s essential for making informed investment decisions.

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