Formula: Coins = Amount invested ÷ Buy price Current value = Coins × Current price Profit = Current value − Amount invested Return % = ((Current price − Buy price) ÷ Buy price) × 100. Your coin quantity is fixed at the moment of purchase, so all later movement shows up in the value line. Because profit is proportional to that fixed quantity, the percentage return equals the percentage change in the coin price — the amount invested scales the dollar result but not the percentage. Fees and spread are excluded.