Employee Stock Option Calculator
Vested value, spread and exercise cost.
Enter your values
Enter the options granted you are working with.
Enter the percent vested in %.
Enter the strike price in $.
Enter the current share price in $.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Paper gain
- $52,000.00
- Vested options
- 10,000
- Exercise cost
- $12,000.00
- Value if fully vested
- $104,000.00
Quick answer
Option value is the spread between current share price and strike price on vested shares.
Gain = vested × (price − strike)
At a glance
| What it does | Vested value, spread and exercise cost. |
|---|---|
| Category | Business |
| Inputs needed | Options granted, Percent vested, Strike price, Current share price |
| Main output | Paper gain |
| Formula | Gain = vested × (price − strike) |
| Cost | Free — no sign-up, no download |
How to use the Employee Stock Option Calculator
- 1Enter options granted and the percentage vested.
- 2Enter your strike price.
- 3Enter the current or expected share price.
Inputs explained
- Options granted
- Enter the options granted you are working with.
- Percent vested(%)
- Enter the percent vested in %.
- Strike price($)
- Enter the strike price in $.
- Current share price($)
- Enter the current share price in $.
Worked example
Using the values the calculator loads with:
Inputs
- Options granted20000
- Percent vested50 %
- Strike price1.2 $
- Current share price6.4 $
Results
- Paper gain$52,000.00
- Vested options10,000
- Exercise cost$12,000.00
- Value if fully vested$104,000.00
Frequently asked questions
Do I owe tax on exercise?
Often yes on the spread — check whether your grant is ISO or NSO equivalent.
What if the price is below strike?
The options are underwater and worth nothing today.
What do I need to enter into the Employee Stock Option Calculator?
Just 4 values: options granted, percent vested, strike price, current share price. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Employee Stock Option Calculator work out the answer?
Option value is the spread between current share price and strike price on vested shares. It applies the formula Gain = vested × (price − strike) and shows the working so you can check each step by hand.
Is the Employee Stock Option Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.