This might be a very easy thing but still
For example:
The price rises from $2500 to $3000, this in an increase of 1.15%.
So should I do 1.15*(the bitcoin amount I have now at the price of 2500) ?
If I understand you very well, you are saying, you bought a bitcoin at price let said for example $2500 and the value has grow to $3000, should you sell it you make profit of 1.5%? If this is what you mean then you are right if you converts your bitcoin to dollar that same day. If you did not sell it? you may even sell at lost if btc/usd pull back below your purchased price because of price fluctuations.