You can find an estimate of your number of podcast subscribers in your playlist, program or organization analytics. Your subscribers will be shown in the "podcast subscribers" section.
It is technically not possible to get a 100% accurate and exact number of podcast subscribers due to various factors including but not limited to shared IPs and server-side feed processing.
Our methodology counts the number of unique IP addresses that downloads the RSS feed in the selected time period, and we filter out downloads that we do not believe to be people subscribing. You can read more about our filtering methodology here.