How many IOTA are in MIOTA?

Could you please clarify the conversion ratio between IOTA and MIOTA? I'm wondering precisely how many individual IOTA tokens constitute one MIOTA. This is important for accurate calculations when dealing with transactions and valuations in the IOTA ecosystem. Could you provide a concise explanation of the conversion rate, or perhaps point me to a reliable resource where I can find this information? Thank you for your assistance in this matter.