PERIMON - Free cycle calendar

PERIMON is a reliable cycle calendar that provides women between 18 and 45 years of age with valuable insights into their menstrual cycle. This software has been providing quality service since 1996 and is effortless to use. By just entering your menstruation date and checking your cervical mucus if required, you can optimise your cycle calendar.

What makes PERIMON stand out from other menstrual calendars is its ability to calculate your actual cycle length and ovulation date to provide optimised forecasts. Additionally, PERIMON is designed with safety at its core. While other menstrual calendars may only show statistical fertility values or designate too many days as infertile by default, PERIMON's fertility analysis relies on individual cycle data and has a wide safety reserve for cycle irregularities.

As with any contraception method, it's essential to ask if PERIMON is safe enough for your needs. PERIMON operates with caution, and if you use it only with the rhythm method, we estimate the Pearl index by comparison to 3.8 or better. If you additionally examine your mucus or cervix on the days in question, which is easy to do, safety will increase up to 1.0. Whenever there is uncertainty, PERIMON leans towards safety.

One of the drawbacks of PERIMON is that it designates at most 10.5 days per cycle as infertile and requires approximately 3-8 cycles before it starts with prediction. However, this is a limitation of the rhythm method that can be extended by combining PERIMON with cervical mucus observation, as we recommend.

Overall, PERIMON is an excellent cycle calendar that provides reliable forecasts and increased safety for women who seek contraception or conceiving aid. Additionally, an online version of PERIMON is available at www.perimon.com for added convenience.