A historical-price scenario, not an account valuation
Select a cryptocurrency, a past date and a positive dollar amount. The tool requires that date's closing quote and a reference quote from the provider. It assumes the entire amount could have bought fractional units at the close, with no fees. An exchange execution or wallet balance may be different.
Reproduce the arithmetic
Modeled units = amount / purchase close. Scenario value = units × reference quote. Profit or loss = scenario value − amount. ROI = profit or loss / amount × 100%. With an illustrative $1,000 amount, $40,000 close and $50,000 reference, modeled quantity is 0.025 units, value is $1,250 and gross ROI is 25%. These invented inputs do not describe a historical trade.
Read the dates before the return
A missing exact-date close produces an error. A provider quote dated before the purchase is also rejected. The quote date comes from its timestamp, not the time you click Calculate. If that timestamp is missing, the price comparison remains a scenario but no holding interval or annualized return is reported.
For intervals of at least 365 days, annualized return = ((value / amount)365/days − 1) × 100%. A 50% total gain over 730 days gives about 22.47% per year under this convention. It is a mathematical equivalent rate, not an expected future return. The page withholds annualization for shorter intervals.
Compare against your actual records
The model excludes fees, spread, tax, staking income, added purchases, withdrawals and token changes. ROI and the endpoint price change coincide here because there are no intermediate cash flows. Neither measures the worst loss during the interval or whether you could have executed at the displayed prices.
Do not infer that the available symbol list covers all past assets or that a longer holding period removes risk. A retrospective endpoint comparison cannot establish an investment recommendation or validate a trading rule.