Bitcoin Price Prediction 2021-2025: How Accurate Was the S2F Model?

When PlanB, a prominent crypto analyst, published his Bitcoin price predictions back in 2020, few could have imagined how closely they would align with actual market performance. The BTC price prediction for 2021-2025 was bold: Bitcoin would climb to around $100,000 by the 2024 halving event. Today, with Bitcoin trading at $70.81K in March 2026, we can now evaluate whether these forecasts proved accurate and what drove Bitcoin’s remarkable trajectory over the past half decade.

Understanding the Stock-to-Flow Model Behind Bitcoin’s Price Prediction

PlanB’s analysis applied a Stock-to-Flow (S2F) model—originally used for precious metals like gold and silver—to Bitcoin’s supply dynamics. This model calculates the ratio of existing supply to annual production. According to the S2F framework, Bitcoin’s scarcity would drive its value higher over time, especially around halving events when block rewards decrease by 50%.

The model projected specific price targets: $14,000 by end of 2020, $26,000 by end of 2021, $35,000 by end of 2022, and $50,000 by end of 2023. The Bitcoin price prediction suggested that by the 2024 halving, BTC could surge approximately 10 times from its May 2020 levels, reaching near $100,000.

Halving Events and Their Historical Impact on Bitcoin’s Price

Bitcoin halving events occur roughly every four years, cutting the network’s new coin issuance in half. The third halving took place on May 12, 2020, following a pattern established by two previous halvings. Historical analysis showed that each prior halving triggered significant bull markets within 12-24 months.

This historical precedent formed the foundation of the BTC price prediction models. If the pattern held true, the 2020 halving would set the stage for sustained price appreciation throughout 2021-2023, culminating in another major price discovery phase by 2024-2025.

Validating the Forecast: Bitcoin Exceeded Initial Price Predictions

The S2F-based Bitcoin price prediction proved remarkably prescient. Bitcoin not only reached the $100,000 target during the 2024 halving period but surpassed it, eventually hitting a record high of $126.08K. This exceeded even the most optimistic initial projections.

Throughout 2021-2023, Bitcoin tracked closely with predicted ranges, validating the model’s predictive power. The correlation between halving cycles and price appreciation demonstrated that the scarcity-driven framework captured fundamental market dynamics. Analysts who incorporated BTC price prediction models into their strategies benefited from understanding these cyclical patterns.

Current Market Position and Lessons for Future Bitcoin Analysis

As Bitcoin trades around $70.81K in mid-2026, the market has consolidated after its 2024-2025 peaks. The initial S2F model’s accuracy provides valuable insights: mathematical frameworks grounded in supply fundamentals can explain Bitcoin’s long-term price behavior, even if short-term volatility remains unpredictable.

The success of this Bitcoin price prediction framework demonstrates why institutional and sophisticated investors increasingly view BTC through the lens of halving cycles and scarcity economics, treating it as digital gold rather than speculative assets. Future Bitcoin price movements will likely continue orbiting around these fundamental supply-side dynamics.