Free options calculators

By Jeffery He, who builds PutFinder in public (X · GitHub).

Free calculators that do arithmetic on the numbers you type. Each runs entirely in your browser — no live market data, no ranking, no recommendation. PutFinder itself is a rules-based cash-secured-put screener; these tools share the same descriptive posture.

The calculators

Cash-secured put calculator →

Enter strike, premium, price, days and contracts to get capital secured, static return, annualized yield, breakeven and downside buffer. Arithmetic on your inputs, not a return prediction.

cash secured put calculator · CSP calculator · put selling return

Covered call calculator →

Enter cost basis, call strike, premium, days and contracts to get premium collected, static (if-unchanged) return, if-called return, annualized yield, breakeven and max gain if called. The other leg of the wheel. Arithmetic on your inputs, not a forecast.

covered call calculator · if-called return · covered call breakeven

From a tool to the screener

The calculators work out the arithmetic for a single contract you type. PutFinder itself scans the full option chain across a curated universe of liquid US stocks every trading day and ranks cash-secured-put setups on a premium-vs-risk basis. See how a cash-secured put screener works, read the scoring methodology, compare cash-secured put vs covered call, or look at today's ranked screen.

Last updated July 16, 2026.