How much salt in a pool 7650 gallons?

I assume you have a salt chlorinator. If you don't there would be no practical reason to add salt to your pool. To determine how much salt to add you must first check the manufacturer of the salt system. A typical level would be around 3000 ppm. The next thing to know would be your gallonage which you have stated to be 1185 gallons. That is a very small pool. A small spa will easily hold 600 gallons, and I have worked on several large spas that would easily hold more than 1185 gallons.

Could it be 11850 gallons?

Double check your gallonage and contact the manufacturer of the salt system. Not all systems run the same salt levels.