BitcoinNow.io

If you had invested in Bitcoin

Pick an amount and a date. The result is computed from daily closing prices stored with this page, so it works without an API key and keeps working when the price feed is rate-limited.

LOADING SRC COINGECKO UPD   BTC NOW  

 
     

The same amount, three ways
Comparison of Bitcoin, gold and the S&P 500
AssetValue now MultipleAnnualised

What that buys
 

 

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Every result has its own link. Opening it runs the same calculation.

Past performance is not a prediction. Bitcoin has lost more than 70% of its value from a high more than once, and a date a few weeks either side of the one you picked can change this number completely. This is arithmetic on two prices. It ignores exchange fees, spreads and any tax you would owe, and it is not financial advice.
Questions
How far back can this go?

To 1 January 2013, the first day in the price history stored with this page. Earlier dates, including Bitcoin Pizza Day in May 2010, are outside the data and the calculator will say so rather than estimate a price.

Where do the numbers come from?

Bitcoin uses Bitstamp daily closes. Gold uses the LBMA Gold Price PM fix. The S&P 500 figure is the total return index, meaning dividends are reinvested. Each source and its as-of date is printed under the comparison table.

How is the annualised return worked out?

It is the compound annual growth rate: divide the value now by the amount invested, raise that to the power of 365 divided by the number of days held, then subtract 1. It answers what steady yearly rate would have produced the same result.

Why is the comparison in US dollars when I picked euros?

The gold and S&P histories stored here are quoted in dollars, and converting them with today's exchange rate would misstate what they were worth on your purchase date. The Bitcoin figure uses your currency; the comparison stays in dollars and says so.