Share Incentive Plan Calculator

Calculate the potential value of your employee stock options

Input Details

Results

Current Value

Total Value

$1,000

Gain Over Exercise

+$1,000

Projected Exit Value

Total Value

$10,000

Gain Over Exercise

+$9,000

Ownership

Equity Percentage

0.01%

Fully Diluted

0.01%

Vesting Schedule

0%
0 shares vested 1,000 shares remaining

Equity compensation is one of the most powerful — and most misunderstood — components of a job offer or employment package. Stock options, restricted shares, and share incentive plans can represent a significant portion of your total compensation, yet most employees have no clear way to translate a grant letter into actual projected value. The Share Incentive Plan Calculator bridges that gap by turning your equity details into concrete numbers: what your options are worth today, what they could be worth at exit, how your ownership stake compares across the whole company, and how your shares unlock over time through vesting.

The core value calculation for stock options is straightforward. The intrinsic value — what your options are worth if exercised right now — is simply the difference between the current share price and your strike price, multiplied by the number of vested shares:

Current Value = (Current Share Price − Strike Price) × Vested Shares

If the current share price is below your strike price, the options are said to be “underwater” and have no immediate exercise value, though they may still gain value as the company grows. The projected exit value follows the same logic but uses your expected future share price instead:

Exit Value = (Expected Exit Share Price − Strike Price) × Total Shares Granted

Your ownership stake — before and after accounting for dilution — is calculated as:

Equity Percentage = Shares Granted ÷ Total Company Shares × 100

This figure matters because raw share counts mean very little without knowing what fraction of the company they represent. 10,000 shares in a company with 100 million outstanding shares is a very different proposition from 10,000 shares in a company with 5 million outstanding shares.

Vesting is the mechanism by which you earn your shares over time rather than receiving them all at once. The most common structure is a four-year vesting period with a one-year cliff, meaning no shares vest at all during the first twelve months, then 25% vest at the cliff date, with the remainder vesting monthly or quarterly over the following three years. The calculator models your specific vesting schedule — including cliff length and vesting frequency — and shows you exactly how many shares have vested to date, how many remain unvested, and a visual timeline of when each tranche becomes yours.

The Advanced Analysis tab extends this further by modelling three growth scenarios — conservative, moderate, and aggressive — using annual share price growth rates you set yourself. These are projected forward across a time horizon of up to ten years, giving you a range of possible outcomes rather than a single point estimate. This is particularly useful when evaluating an offer from an early-stage company where future share price is highly uncertain and the difference between a 10% and 50% annual growth assumption has enormous implications for eventual payout.

The calculator also surfaces the key tax considerations that affect how much of your equity gain you actually keep. Incentive Stock Options (ISOs) and Non-qualified Stock Options (NSOs) are taxed very differently: ISOs may qualify for long-term capital gains treatment if you meet specific holding period requirements after exercise, while NSOs are taxed as ordinary income at the point of exercise on the spread between the strike price and fair market value. Exercising ISOs can also trigger Alternative Minimum Tax (AMT) if the spread is large, which catches many employees off guard. For restricted stock, filing an 83(b) election within 30 days of your grant date locks in the tax obligation at the grant value rather than the typically higher vested value — a decision with potentially significant long-term tax savings that cannot be undone after the window closes.

To use the calculator, enter the number of options or shares granted, your strike price, the current share price, your expected exit share price, the vesting period length, the cliff period in months, your vesting frequency, and the total number of company shares outstanding. Click Calculate to see your current value, projected exit value, gain over exercise price, ownership percentage, and vesting progress. Switch to the Advanced Analysis tab to adjust growth scenario sliders and projection years, then click Update Projections to see how different growth trajectories affect your potential outcome.

This tool is most valuable when you are comparing job offers that include equity components alongside salary, when you are deciding whether and when to exercise options ahead of a liquidity event, when you want to understand how a new funding round and associated dilution affects the real value of your existing grant, or simply when you want a clear and honest picture of what your equity package is actually worth at this moment in time.

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