Stock Option Value Calculator
Works out what your vested options would cost to exercise and the gain on paper at a share price you assume.
Share sends a link that reopens these numbers. Copy details pastes the full breakdown as a list.
The formula
cost to exercise = strike × options paper gain = max(price − strike, 0) × options
An option is a right to buy, not a duty, so it counts as zero when the share price is below the strike.
What to watch out for
Use only vested options. The share price is yours to choose, so try a low figure as well. The result is before tax and takes no account of any costs of selling.
Frequently Asked Questions
How do I work out the paper gain on my options?
Take the strike from the share price and multiply by the options. 10,000 options with a strike of 1.50 at an assumed 4.00 cost 15,000 to exercise and show a paper gain of 25,000.
What if the share price is below the strike?
The paper gain is 0, not a negative amount, because you do not have to exercise them. 1,000 options with a strike of 4.00 at 3.00 show no gain.
Is tax included?
No. Tax on options varies by country and by option type, and in some cases it can fall due on exercise, before the shares can be sold.