Employee Stock Option Value Calculator

Estimate the value of employee stock options at various exit valuations, accounting for strike price, vesting, dilution, and the spread between grant and exit.

📈 Equity📐 Option value = (exit price per share − strike price) × vested shares💼 Business

Number of options granted

Strike price per share

Total shares outstanding (fully diluted)

Exit valuation

Percent vested (%)

Expected future dilution (%)

Please enter valid values.

Formula & Reference

Variable	Symbol	Formula	Units
Employee Stock Option Value Calculator	—	Option value = (exit price per share − strike price) × vested shares	currency

Step-by-Step Examples

Example 1

Meaningful Exit

20,000 options, strike 1.20, 12M shares, 180M exit, 50% vested, 25% future dilution.

Diluted shares = 12M × 1.25 = 15M
Price per share = 180M / 15M = 12.00
Vested options = 10,000
Spread = 12.00 − 1.20 = 10.80
Gross = 10,000 × 10.80 = 108,000

✓ 108,000 gross, before tax

Example 2

Underwater Options

20,000 options, strike 4.50, 12M shares, 40M exit, 100% vested, 25% dilution.

Diluted shares = 15M
Price per share = 40M / 15M = 2.67
Strike 4.50 exceeds 2.67
Options are underwater and worth nothing

✓ 0 — underwater

Example 3

Dilution Impact

Same grant, exit 180M, but 60% future dilution instead of 25%.

Diluted shares = 12M × 1.60 = 19.2M
Price per share = 180M / 19.2M = 9.375
Spread = 8.175, gross = 81,750
Additional dilution cost roughly 26,000

✓ 81,750 — dilution matters

Real-World Applications

💼

Offer Evaluation

Translating an option grant into a value range at plausible exit valuations makes an offer comparable against cash compensation.

📉

Dilution Awareness

Future funding rounds dilute existing holders, and modelling this prevents overestimating a grant's worth.

💰

Exercise Planning

Knowing the exercise cost in advance matters, since exercising can require substantial cash before any liquidity event.

📊

Scenario Modelling

Running several exit valuations gives a realistic range rather than a single optimistic figure.

Common Mistakes to Avoid

⚠️

Ignoring liquidation preferences

Preferred shareholders are typically paid first. In a modest exit, preferences can absorb most or all proceeds, leaving common shares and options worth far less than a simple per-share calculation suggests.

⚠️

Forgetting tax entirely

Option exercise and sale carry tax consequences that vary substantially by option type and jurisdiction, and can consume a large share of the gross figure.

⚠️

Assuming no further dilution

Most companies raise additional rounds before exit. Modelling zero dilution systematically overstates the outcome.

Frequently Asked Questions

How do I value employee stock options? ▾

Estimate the exit price per share by dividing exit valuation by fully diluted shares, subtract the strike price, and multiply by vested options.

What does underwater mean? ▾

The strike price exceeds the current or exit share price, so exercising would cost more than the shares are worth. The options have no value in that scenario.

What is a liquidation preference? ▾

A right allowing preferred investors to be repaid before common shareholders. In smaller exits it can absorb most proceeds, leaving little for option holders.

How much dilution should I assume? ▾

It depends on how many rounds remain before exit. Assuming 20 to 50% cumulative future dilution is common for early-stage grants, but it varies widely.

Do I have to pay to exercise options? ▾

Yes, the strike price multiplied by the options exercised, plus any tax due at exercise. This can be a substantial cash requirement before any liquidity exists.