Male Fertility Calculator

This calculator's default values represent a semen analysis that already clears every WHO 2021 reference threshold -- the lower reference limits published in the World Health Organization's Laboratory Manual for the Examination and Processing of Human Semen, 6th edition (2021): 1.4 mL volume, 16 million/mL concentration, 42% total motility, 30% progressive motility, and 4% normal morphology -- so Fertility index starts at its 100-point ceiling and doesn't move until one of the six parameter inputs (volume, concentration, total count, motility, progressive motility, morphology) drops far enough to fall below its own reference value -- each parameter's contribution is capped the moment it reaches the WHO minimum, so exceeding that minimum by a little or a lot scores identically. What actually pulls the index down from a fully-normal profile are the lifestyle multipliers: smoking cuts it 15%, a varicocele diagnosis cuts it 20%, a BMI of 30+ cuts it 10% (35+ cuts 20%), and age 40+ applies a further age-tiered reduction -- all applied as multipliers after the six parameters are summed, so they scale down an already-capped score rather than adding to it.

Total motile sperm count (TMSC) is calculated independently as volume x concentration x motility%, and is the number most directly tied to IUI/IVF treatment pathway recommendations. This tool applies WHO 2021 lower reference limits (5th percentile values) to a single semen analysis; real fertility assessment requires multiple samples and a physician's interpretation, since a single abnormal parameter does not diagnose infertility.