FreeByte

Stock option value calculator

Paper value of a grant.

Built and reviewed by Dovanic, Founder and editor, FreeByteLast reviewed: 2026-08-18
$
$
50%
35%

Value after tax

$19,500

Gross spread

$30,000

With these inputs, value after tax comes to $19,500. Gross spread works out to $30,000.

Vested options
4,000
Cost to exercise
$18,000
Unvested value
$30,000

What moves the number · Value after tax

Input−10%Now+10%
Options granted$17,550$19,500$21,450
Strike price$20,670$19,500$18,330
Current share price$16,380$19,500$22,620
Vested$17,550$19,500$21,450
Tax on exercise$20,550$19,500$18,450

Solve for an input

Whatmakesequal

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Paper value of a grant.

A worked example

Starting figures

Options granted
8,000
Strike price
$4.50
Current share price
$12
Vested
50%
Tax on exercise
35%

What it returns

Value after tax
$19,500
Gross spread
$30,000
Vested options
4,000
Cost to exercise
$18,000
Unvested value
$30,000

How to read the results

With the defaults above, value after tax works out at $19,500.

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