1. Calculate the cost basis of your investment in the cryptocurrency you want to calculate returns for. This cost basis should include all costs associated with acquiring the cryptocurrency, including broker fees and commissions, exchange fees, and any other applicable fees.
2. Find the current price for that cryptocurrency by checking an exchange or reliable source.
3. Subtract the cost basis in Step 1 from the current price in Step 2. This will give you the return on your investment.
4. Multiply the return figure from Step 3 by 100, and then divide by the cost basis in Step 1. This will give you a percentage return on your investment.