How is inflation/deflation calculated?

Question

How is inflation/deflation calculated?

In: Economics

Answer 1

If I buy a apple today, and its 1.00$

then I buy a apple 365 days from now, and its 3.00$

I can reasonably say, the price of apple inflated by 200%

Now I compare the price of milk and bread, and they all seem to go up by 200%.

Using these data points, I can make the reasonable assumption that “everything has been inflated by 200%, its time to become a comrade”