Inflation is newly mined coins added to circulating supply. When block rewards become zero and transaction fees are the only incentives for miners, there won't be any new coins added to circulating supply.
According to https://www.viewbase.com/inflation (In last 24 hours):
1031 BTC mined
Circulating Supply of Bitcoin is 18,504,668 BTC
% of newly mined coins(...
The currency supply of Bitcoin currently inflates at about 2.5% p.a.. However, this is what economists refer to as monetary inflation. The supply is disinflationary, because the rate of monetary inflation is decreasing over time as each block increases the supply by a smaller relative amount.
When people speculate about Bitcoin being inherently "...