Covered Call Calculator
Selling calls against coins you hold: premium now, upside capped at the strike. This shows the payoff at any expiry price and the exact cost of the cap.
Results (live)
Estimates only, not financial advice. All math runs in your browser; nothing you type leaves this page.
How it works
P&L = min(expiry, strike) − spot + premium
max profit = strike − spot + premium
Worked example
Holding BTC at $65k, selling a $72k call for $1,800: at $70k expiry you make $6,800. At $85k you still make only $8,800; the $13k above strike belonged to the buyer.
FAQ
When do covered calls hurt?
In face-melting rallies, where the cap forfeits the move that pays for years of premiums. Sellers eat well until the one candle that feeds buyers.
What strike should I sell?
Further strikes pay less but cap later. Many sellers use 10-20% out-of-the-money monthlies and accept assignment cheerfully as 'selling the top I said I'd sell.'
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Estimates only, not financial, tax or investment advice. Verify numbers against your exchange or a professional before acting.