How to Calculate Options Profit by Hand

The most common error in options trading is treating a call option's profit as simply the underlying price minus the strike price, which is why you must learn how to calculate options profit correctly. That calculation ignores the premium you paid for the option itself, and it misses the max(0, …) floor that prevents an out-of-the-money option from showing a negative intrinsic value. Honest profit math starts with the premium as a sunk cost that must be recovered by price movement, not as a fee you can ignore. You calculate options profit by hand, step by step, using the same formulas a broker's P&L statement uses at expiration. You do this to verify your broker's numbers, not to estimate future gains.

Gather these six items from your trade ticket. Without every one, the calculation will be wrong.

Option type and position. A call gives the right to buy; a put gives the right to sell. A long position means you bought the option; a short position means you sold it. These two choices produce four distinct profit formulas.

Strike price. The fixed price per share at which you can buy (call) or sell (put). This is known at entry and does not change.

Premium. The cost per share you paid (long) or received (short). This is the maximum loss for a long position and the maximum gain for a short position, before commissions.

Number of contracts. Each standard options contract represents 100 shares. One contract on a stock with a $100 strike covers 100 shares at $100 each.

Commission per contract. The fee your broker charges per contract. Even a small commission can turn a marginal profit into a loss, especially on low-premium options.

Underlying price at expiration. The settlement price of the underlying contract on the expiration date. This is the only variable you do not know at entry.

The intrinsic value is what the option is worth if exercised immediately at expiration. It is always non-negative because the holder will not exercise an option that is out-of-the-money.

For a call: intrinsic value = max(0, underlying price, strike price).

For a put: intrinsic value = max(0, strike price, underlying price).

The max(0, …) function is not optional. Without it, an option that expires worthless would show a negative intrinsic value, which overstates the loss. The OCC 'Characteristics and Risks of Standardized Options' document defines this floor as a property of the contract itself, not a modelling choice.

Once you have the intrinsic value, the profit per share depends on whether you are long or short.

Long positions (bought the option): profit per share = intrinsic value, premium paid. The premium is a cost, so it reduces profit. If the intrinsic value is zero, the profit per share is negative, equal to the premium paid.

Short positions (sold the option): profit per share = premium received, intrinsic value. The premium is revenue, so it adds to profit. If the intrinsic value is zero, the profit per share is positive, equal to the premium received. If the intrinsic value exceeds the premium, the profit per share becomes negative, the short seller loses more than the premium collected.

This asymmetry is why short positions have theoretically unlimited loss. A short call can lose far more than the premium if the underlying price rises sharply.

Each contract represents 100 shares, so multiply the per-share profit by 100 to get the gross profit per contract. Then multiply by the number of contracts if you traded more than one. Finally, subtract the commission per contract times the number of contracts.

The order matters: commission is a fixed cost per contract, not a per-share cost. A common mistake is to treat the premium as a per-contract figure when it is actually per share. A $3 premium per share on one contract costs $300, not $3.

If you closed the position before expiration, profit = exit premium, entry premium. The intrinsic value at expiration never enters the calculation because you never reached expiration. For early exercise of an American option, the profit calculation differs; the OCC early exercise material covers those rules.

In-the-Money Long Call

Setup: You buy one call on stock XYZ with a strike price of $100 per share. You pay a premium of $3 per share ($300 per contract) and a $5 commission. The underlying price at expiration is $110.

Intrinsic value: max(0, $110 - $100) = $10 per share.
Profit per share: $10 - $3 = $7 per share.
Per contract: $7 × 100 = $700.
Subtract commission: $700 - $5 = $695 net profit.

Out-of-the-Money Long Call

Same setup, but the underlying price at expiration is $95. Intrinsic value: max(0, $95 - $100) = $0 per share.
Profit per share: $0 - $3 = -$3 per share.
Per contract: -$3 × 100 = -$300.
Subtract commission: -$300 - $5 = -$305 net loss.

Notice the loss equals the premium plus commission, not the strike price minus the underlying price. The max(0, …) floor prevents the loss from being larger than the premium.

In-the-Money Long Put

Setup: You buy one put on stock ABC with a strike price of $50 per share. You pay a premium of $2 per share ($200 per contract) and a $3 commission. The underlying price at expiration is $45.

Intrinsic value: max(0, $50 - $45) = $5 per share.
Profit per share: $5 - $2 = $3 per share.
Per contract: $3 × 100 = $300.
Subtract commission: $300 - $3 = $297 net profit.

Out-of-the-Money Long Put

Same setup, but the underlying price at expiration is $55. Intrinsic value: max(0, $50 - $55) = $0 per share.
Profit per share: $0 - $2 = -$2 per share.
Per contract: -$2 × 100 = -$200.
Subtract commission: -$200 - $3 = -$203 net loss.

In-the-Money Short Call

Setup: You sell one call on stock DEF with a strike price of $80 per share. You receive a premium of $2 per share ($200 per contract) and pay a $2 commission. The underlying price at expiration is $90.

Intrinsic value: max(0, $90 - $80) = $10 per share.
Profit per share: $2 - $10 = -$8 per share.
Per contract: -$8 × 100 = -$800.
Subtract commission: -$800 - $2 = -$802 net loss.

The loss is far larger than the premium because the short seller is obligated to deliver the underlying at $80 when it is worth $90.

Out-of-the-Money Short Call

Same setup, but the underlying price at expiration is $75. Intrinsic value: max(0, $75 - $80) = $0 per share.
Profit per share: $2 - $0 = $2 per share.
Per contract: $2 × 100 = $200.
Subtract commission: $200 - $2 = $198 net profit.

The short seller keeps the full premium when the option expires worthless.

In-the-Money Short Put

Setup: You sell one put on stock GHI with a strike price of $60 per share. You receive a premium of $2.50 per share ($250 per contract) and pay a $4 commission. The underlying price at expiration is $55.

Intrinsic value: max(0, $60 - $55) = $5 per share.
Profit per share: $2.50 - $5 = -$2.50 per share.
Per contract: -$2.50 × 100 = -$250.
Subtract commission: -$250 - $4 = -$254 net loss.

Out-of-the-Money Short Put

Same setup, but the underlying price at expiration is $65. Intrinsic value: max(0, $60 - $65) = $0 per share.
Profit per share: $2.50 - $0 = $2.50 per share.
Per contract: $2.50 × 100 = $250.
Subtract commission: $250 - $4 = $246 net profit.

If you close an options trade before expiration, the profit formula changes. Profit = exit premium, entry premium, minus commissions on both legs. The intrinsic value at expiration never enters because you never reached expiration.

For example, you buy a long call for a $3 premium per share. Later, before expiration, you sell the same call for a $4 premium per share. Profit per share = $4, $3 = $1. Multiply by 100 and subtract commissions. This works for short positions too: sell at a $2 premium, buy back at $1.50, profit per share = $2, $1.50 = $0.50.

The Cboe Options Institute strategy pages cover the mechanics of closing positions before expiration, including the bid-ask spread that can eat into the difference.

• Forgetting the multiplier. Options are priced per share, but each contract covers 100 shares. A $3 premium per share is $300 per contract, not $3. Failing to multiply by 100 understates profit or loss by a factor of 100.
• Using the wrong intrinsic value formula. Calls use (underlying, strike); puts use (strike, underlying). Swapping them produces a negative intrinsic value that makes no economic sense.
• Confusing long and short positions. Long positions subtract the premium; short positions add it. A trader who treats a short call like a long call will expect profit where there is loss and vice versa.
• Ignoring commissions on both legs. For a trade opened and closed before expiration, commission applies at entry and at exit. Failing to subtract both can turn a small profit into a loss.
• Treating the premium as a per-contract figure. The premium is always per share. If a broker quotes a $3 premium, it is $3 per share, meaning $300 per contract. This mistake alone causes errors of 100x.
• Neglecting the number of contracts. Multiply the per-contract result by the total number of contracts. Trading two contracts doubles both profit and loss.