When do you ovulate if your cycle is 30 days?

If your menstrual cycle is 30 days, you typically ovulate 14 days before the start of your next period. Ovulation occurs when a mature egg is released from one of the ovaries. In a 30-day cycle, ovulation usually happens around day 16 (counting from the first day of your last period). However, it's important to note that ovulation can vary from person to person and cycle to cycle, so it's not an exact science.