Home / Calculators / Male fertility / Semen analysis interpreter
Every calculator in one place, free and with no sign-up. Results show instantly — we don't hide them behind a form. Each one explains what the number means, where the reference ranges come from, and what it cannot tell you.
A calculator sees three or four figures. A specialist sees your history, your scans, your partner's results, and how you actually responded to treatment. If you're between cycles, changing clinics, or something in your results doesn't add up, a second opinion is the fastest way to find out whether anything would be done differently.
Free first consultation. No obligation to start treatment, and it doesn't affect your care at your current clinic.
These tools provide general information and are not a diagnosis or a substitute for assessment by a qualified clinician. Reference ranges and sources are stated on each calculator. Predictive estimates describe groups of people and cannot predict an individual outcome.
A calculator sees three or four figures. A specialist sees your history, your scans, your partner's results, and how you actually responded to treatment. If you're between cycles, changing clinics, or something in your results doesn't add up, a second opinion is the fastest way to find out whether anything would be done differently.
Free first consultation. No obligation to start treatment, and it doesn't affect your care at your current clinic.
Your report against the WHO 2021 reference limits, with the context those limits need.
Compared to published rangesYour values checked against published reference limits. The source is named below; laboratory methods vary.
Each value is compared against the WHO 2021 lower reference limit. Those limits are the 5th centile of men whose partners conceived within a year, so five per cent of men with proven fertility fall below each one. A result under a limit is not a diagnosis.
Source — Reference limits from the WHO laboratory manual for the examination and processing of human semen, sixth edition (2021): volume 1.4 mL, concentration 16 million/mL, total number 39 million, total motility 42%, progressive motility 30%, normal forms 4%. These are 5th-centile values, not thresholds separating fertile from infertile men.
The bands on this page are drawn from published sources but have not yet been reviewed by our medical team, and some vary by laboratory or assay. Check against the reference range printed on your own report.
WHO lower limit 1.4
WHO lower limit 16
WHO lower limit 42
WHO lower limit 30
WHO lower limit 4
That falls in the one below band.
Your result of 0 below reference sits in the highlighted band. Bands are reference points used alongside clinical findings — not a diagnosis.
A single parameter below its limit is common and often not repeated on a second sample. Confirm with a repeat test using the same 2 to 7 day abstinence period before drawing conclusions.
Reference limits from the WHO laboratory manual for the examination and processing of human semen, sixth edition (2021): volume 1.4 mL, concentration 16 million/mL, total number 39 million, total motility 42%, progressive motility 30%, normal forms 4%. These are 5th-centile values, not thresholds separating fertile from infertile men.
Highlighted is the stage this measurement belongs to. It is a map of the process, not a schedule — timings vary by protocol and by clinic.
Not on its own. Semen parameters vary considerably in the same man between samples, which is why a confirmatory second test is standard. Incomplete collection or abstinence outside 2 to 7 days can also produce a falsely low result.
Total motile count, combining volume, concentration and motility, predicts treatment options better than any single figure. Morphology alone is the weakest predictor and is often over-interpreted.
Very little on its own. The limits are the 5th centile of men whose partners conceived naturally within a year, so some men with proven fertility sit below them. Results are read alongside your history and your partner assessment.
A calculator sees three or four figures. A specialist sees your history, your scans, your partner's results, and how you actually responded to treatment. If you're between cycles, changing clinics, or something in your results doesn't add up, a second opinion is the fastest way to find out whether anything would be done differently.
Free first consultation. No obligation to start treatment, and it doesn't affect your care at your current clinic.
Reference limits describe the sample, not the ability of sperm to fertilise an egg. A single result is rarely conclusive. Nothing here is a diagnosis or a substitute for assessment by a clinician.
A calculator gives you a number. These explain what it means, and what it does not.
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