US What if I bought bitcoin? calculator

How this calculator works

The calculation is deliberately simple and fully transparent: your hypothetical amount is divided by bitcoin's documented price on January 1 of the chosen year (giving the BTC you'd have bought), then multiplied by the current price. Historical year-start prices come from public market records; the current price refreshes live from CoinGecko when the page loads, with a dated fallback otherwise.

Why year-start prices?

Bitcoin's intra-year swings are enormous — in 2017 alone it traded between roughly $780 and $19,800. Anchoring on January 1 gives every year a consistent, documented, non-cherry-picked reference point. Treat results as representative of "bought early that year," not of any specific day.

The honest context behind the big numbers

Hindsight calculators make every early purchase look easy. Holding through the actual history was not: bitcoin fell over 80% in 2011, ~85% from the 2013 peak, ~84% from the 2017 peak, and ~77% from the 2021 peak. Most buyers who'd have realised these returns would have had to watch their holding collapse by three-quarters at least once without selling. That survivorship reality — not the multiple — is the real lesson of this page.

Why the S&P 500 comparison matters

The same money compounding in a broad index fund is the standard opportunity-cost benchmark. Bitcoin beat it dramatically from most historical start dates — with many times the volatility and drawdown depth. The comparison keeps both the upside and the risk in one frame.

Want the recurring-purchase version of this question? See the Bitcoin DCA calculator. Tax on a sale? The crypto tax calculator estimates the bill in four countries.