Use a stock options calculator to maximize your profit potential?

A stock option is a contract that gives you the right, but not the obligation, to buy or sell a set number of shares at a fixed price on or before a set date. That fixed price is the strike. Companies hand options to staff and shareholders as part of pay, and the same instruments trade openly on exchanges.

Updated October 23, 2026

What is a stock option?

Say you work at ABC Inc. and 1,000 stock options come with your 2026 bonus. The strike is $50, so the options let you buy 1,000 ABC shares at $50 each regardless of the market price. They also carry an expiration date, here December 31, 2027, and after it they are worth nothing.

How the stock options calculator works

The stock options calculator works out what your contracts are worth now and what they would be worth at a price you expect. Feed it the current stock price, the strike, the number of contracts, the premium and your expected price at expiry, and it returns total cost, break even, profit or loss and return on the position.

Here is what goes into the fields:

Current stock price: what the share trades at today.

Strike price: the price fixed in the contract.

Number of contracts: one contract normally covers 100 shares.

Option premium: what you pay per share for the contract.

Expected price at expiry: where you think the stock lands.

Option type: call if you expect the price to rise, put if you expect it to fall.

Worked example: an ABC call option

Take the ABC options above and put them through the calculator. The inputs look like this:

Current stock price of ABC: $60.

Strike price of the options: $50.

Number of options: one contract, which covers 100 shares.

Expected price at expiry: $110.

Expiration date: December 31, 2027.

Pick “Call” as the option type and press Calculate. With these numbers the contract is already $10 per share in the money, and at an expected $110 it would be $60 per share in the money. The calculator takes that value at expiry, subtracts what the contract cost you, and shows the result in dollars and as a percentage.

The formula behind the calculator

The maths is short enough to do on paper, and knowing it lets you sanity check any calculator you use.

Intrinsic value of a call = stock price minus strike, floored at zero. For a put it is strike minus stock price, again floored at zero.

Total cost = premium per share × 100 × number of contracts.

Break even on a call = strike plus premium per share. On a put it is strike minus premium per share.

Profit or loss = (intrinsic value at expiry minus premium) × 100 × number of contracts.

Return on the option = profit or loss divided by total cost, as a percentage.

Now run the ABC numbers. The stock sits at $60 against a $50 strike, so intrinsic value today is $10 per share. Say the premium is $12: total cost is $1,200 for one contract and break even sits at $62. At the expected $110, intrinsic value becomes $60 per share, profit is ($60 minus $12) × 100, or $4,800, and the return works out at 400 percent. The same move would have paid roughly 83 percent to someone holding 100 shares outright, and that gap is why traders use options.

What results the calculator shows

The output covers several numbers at once:

Intrinsic value: the difference between the stock price and the strike, and zero when the option is out of the money.

Time value: how much the option price exceeds intrinsic value. This is what you pay for the time left until expiry, and it decays to zero on the last day.

Break even: the stock price at which you neither gain nor lose once the premium is accounted for.

Profit or loss: the value of the position at your expected price, minus what the contracts cost you.

Return on the option: that profit or loss expressed as a percentage of the premium you paid.

For the ABC call above, the output reads like this:

Intrinsic value: $10 per share, because the stock trades $10 above the $50 strike.

Time value: whatever the market charges on top of that $10. It is the part of the premium that disappears by expiry, whether the stock moves or not.

How to read the results

The numbers exist to show how the position behaves under different conditions:

Positive intrinsic value means the option is in the money, and exercising it right now would produce a gain.

Positive time value means the contract still has room to move and is worth more than intrinsic value alone.

Break even tells you where the trade turns profitable. A call needs the stock above strike plus premium by expiry, a put needs it below strike minus premium.

A positive profit figure means the trade works at your expected price. A negative one means it does not, and holding longer will not fix that.

The return percentage puts profit next to what you paid. A high number means the premium bought a lot of exposure, a low one means most of the move went into covering the cost of the contract.

The calculator earns its keep when you run several versions of the same trade:

Change one input at a time and watch what moves. Premium and expected price shift the result hardest.

Compare a call against a put on the same stock at the same strike.

Test different exits: exercising early, closing at the money, or holding all the way to expiry.

Model a hedge by pairing the option with a second contract, with the underlying shares, or with bonds.

What the calculator does not tell you

It does not price volatility, dividends or the risk of early assignment, and it is no substitute for professional advice and your own due diligence. Treat every output as one scenario, not a forecast.

FAQ

What does the stock options calculator do?

It converts option inputs into money. You give it the stock price, strike, premium, number of contracts and an expected price at expiry, and it returns intrinsic value, total cost, break even, profit or loss and the return on the premium you paid.

How is the result calculated?

Intrinsic value is stock price minus strike for a call, or strike minus stock price for a put, never below zero. Profit is intrinsic value at expiry minus the premium, multiplied by 100 shares per contract. Return is that profit divided by total cost.

What values do I need to enter?

Six: current stock price, strike price, number of contracts, premium per share, expected price at expiry and the option type. The premium is the one people skip, and leaving it out makes the profit figure look better than the trade really is.

Can I use it for crypto and forex?

Only where the instrument is a real option contract with a strike and an expiry. It does not fit spot crypto or a forex position, which have no premium and no strike. For those, a position size or profit calculator is the right tool.