Stock Options Calculator - Exercise Cost and Value

A strike price, also known as a grant price, is the fixed price per share at which you have the legal right to purchase company stock. For example, if your strike price is $2.00, you can buy shares for $2.00 each, regardless of how high the market price rises in the future.

Option value is calculated by subtracting your strike price from the current market price per share, then multiplying that result by the number of vested options you own. This result is your "gross spread" or pre-tax intrinsic value. Platform fees and taxes then reduce this to a net value.

ISOs (Incentive Stock Options) are tax-advantaged grants for employees that may qualify for capital gains rates. NSOs (Non-Qualified Stock Options) are more common and are taxed as ordinary income upon exercise. NSOs are also subject to payroll taxes (FICA), whereas ISOs are generally exempt from them.

In 2026, NSO spreads are taxed as ordinary income at exercise. ISOs are not taxed at exercise for regular income tax purposes, but the spread is included in the Alternative Minimum Tax (AMT) calculation. Both types are subject to capital gains tax on any growth that occurs after the exercise date.

Options are "underwater" or "out of the money" when the current market share price is lower than your strike price. In this scenario, the options have zero intrinsic value because it would be cheaper to buy shares on the open market than to exercise your options.

Generally, no. Employee stock options are non-transferable. To realize the value, you must first "exercise" them (buy the shares) and then sell the shares on the stock market. Some companies offer "cashless exercises" where the broker sells enough shares to cover the exercise cost and taxes automatically.

A vesting schedule is the timeframe over which you earn the right to exercise your options. A common schedule is "4-year vesting with a 1-year cliff," meaning you earn zero options for the first year, 25% at the one-year mark, and the remainder monthly over the next three years.

On a grant of 20,000 options, a $1.00 increase in the market share price adds exactly $20,000 to your pre-tax intrinsic value. Because your strike price remains fixed, every dollar of market growth translates directly into a dollar of additional profit per share.

This calculator does not model: (1) complex vesting schedules or "cliffs"; (2) the specific rules of Alternative Minimum Tax (AMT); (3) state-specific tax variations; (4) lock-up periods following an IPO; or (5) the expiration dates of your grants, which typically occur 10 years after the grant date.

Early exercise can be beneficial if your company allows it, as it starts the clock for long-term capital gains and may minimize AMT. However, it requires an upfront cash payment for shares that may never become liquid or have any value. It is a high-risk, high-reward financial strategy.