How would I value a capital loss of a share?

Hi there, does anybody know how I would value a capital of a share?
For example: If my shares were valued at $10.00 per share, and they fell to only $1.00, how much capital value would I have lost? $9? or is it more complicated then that.

Does capital value have anything to do with my total value of shares (in this example it is $65million)?

I'm confused, does anybody have a simple way of explaining this?

 

You lost $9.

 

And 90%

But once you're at $1 you will need it to increase 900% just to get back to your $10 starting point

Happened to a semi-retiree I knew with income funds, LPT's etc

 

There are losses and then there's this guy

Chinese Billionaire Loses $27 Billion In World's Biggest Wealth Drop

Pinduoduo Inc's Colin Huang's fortune has dropped by over $27 billion, according to the Bloomberg Billionaires Index, after the companys stock plunged as China cracked down on its internet giants.

Colin Huang, the founder of Chinese e-commerce platform Pinduoduo Inc, has lost more wealth this year than anyone else in the world.

 

Capital loss / gain =
( Purchase price per share - selling price per share ) x number of shares sold =
Purchase price - selling price

This all becomes more complicated with share splits etc.

https://www.finder.com.au/capital-gains-tax-calculator