Fees on both sides — the part most crypto calculators skip
Exchanges take a cut twice: once when you buy (you receive slightly fewer coins than your money would suggest) and once when you sell (you keep slightly less than coins × price). At 0.5% per side, a coin that returns to your exact purchase price leaves you about 1% underwater. This calculator applies both fees where they actually occur, so profit, ROI, and — most importantly — your break-even price reflect what lands in your account, not the chart.
Amount invested vs coin quantity
Most people remember “I put in $1,000 when it was $30,000,” not “I hold 0.03316 BTC” — so the default mode starts from the amount invested and derives your coin quantity after the buy fee, to eight decimal places. If you track holdings by quantity (from your wallet or exchange balance), switch modes and the calculator works from coins instead. Either way, the × multiple tells the story crypto natives care about: 1.49× means every dollar in became $1.49 out, after all fees.
Planning trades that haven’t happened yet
Enter the current price as the sell price to mark a position to market, or a hypothetical target to see what an exit there would pay after fees. The break-even figure is the discipline check: any sell below it is a realized loss no matter what the chart says. Averaging into a coin across several buys? Get your blended entry first with the average cost calculator — the math is identical for crypto — or project a recurring investment plan with the investment growth calculator.