option strategy calculator - Aaron Graves, PhDude Replica

Strategy

Number of contracts

1 options contract = 100 shares

Underlying price at expiration ($)

Call strike price ($)

Call premium paid ($ per share)

Put strike price ($)

Put premium paid ($ per share)

Stock purchase price ($ per share)

Short call strike price ($)

Call premium received ($ per share)

Short put strike price ($)

Put premium received ($ per share)

Long call lower strike ($)

Long call premium paid ($ per share)

Short call higher strike ($)

Short call premium received ($ per share)

Educational use only. This tool estimates expiration P/L and does not include commissions, assignment risk timing, taxes, or implied volatility changes before expiration.

What this option strategy calculator does

This calculator helps you estimate potential profit and loss at expiration for common options trades. Instead of manually building payoff diagrams every time, you can plug in your strike prices, premiums, number of contracts, and expected stock price at expiration to quickly evaluate risk and reward.

If you are comparing several options setups for the same stock, this is especially useful for seeing how breakeven levels and capped versus uncapped outcomes change from one strategy to another.

Supported strategies

Long Call: bullish, limited risk (premium paid), unlimited upside.
Long Put: bearish, limited risk (premium paid), profits when price falls.
Covered Call: hold shares and sell a call to generate income; upside is capped.
Cash-Secured Put: sell a put while setting aside cash for potential share assignment.
Bull Call Spread: bullish debit spread that reduces cost but caps upside.

How the math works

1) Long Call

P/L per share = max(S - K, 0) - Premium

You benefit if the underlying price (S) finishes above the strike (K) by more than the premium paid. Breakeven is simply strike plus premium.

2) Long Put

P/L per share = max(K - S, 0) - Premium

This gains value as the stock drops below the strike. Breakeven is strike minus premium.

3) Covered Call

P/L per share = (S - Stock Cost) + Call Premium - max(S - Call Strike, 0)

The call premium lowers your effective cost basis, but your upside is capped at the short call strike.

4) Cash-Secured Put

P/L per share = Put Premium - max(Put Strike - S, 0)

You keep premium if price stays above strike. If price falls below strike, losses grow similarly to owning stock from an effective purchase price of strike minus premium.

5) Bull Call Spread

P/L per share = max(S - K1, 0) - max(S - K2, 0) - (Long Premium - Short Premium)

This strategy buys a lower-strike call and sells a higher-strike call. It costs less than a naked long call, but max gain is limited to the strike width minus net debit.

Interpreting results like a risk manager

Estimated P/L at expiration: what your strategy could make or lose at your chosen price point.
Breakeven: the underlying price where expiration P/L is approximately zero.
Max profit: may be capped (spread, covered call) or unlimited (long call).
Max loss: use this to size positions before entering any trade.
Capital at risk: helps compare strategy efficiency and potential return.

Practical tips before placing a trade

Know whether your thesis is directional, neutral, or volatility-driven.
Use expiration that matches your expected timeline for the move.
Check liquidity (bid/ask spread and open interest) to reduce slippage.
Plan exits in advance: profit target, stop-loss, and adjustment rules.
Be aware of earnings and macro events that can move implied volatility fast.

Limitations of a static expiration calculator

This tool intentionally focuses on expiration outcomes. Real-life options pricing before expiration includes time value, changing implied volatility, and Greek exposure (delta, gamma, theta, vega). So use this calculator for scenario planning, not as a guaranteed forecast.

Bottom line

A good option strategy is not about finding a trade with the highest possible return. It is about finding the best balance of probability, risk, and payoff for your market view. Use the calculator to compare structures quickly, then pair it with disciplined position sizing and risk controls.