Evaluate semen analysis results against WHO reference ranges — assess volume, concentration, motility, morphology, and more
💡 Tip: Leave any field blank to exclude it from the assessment.
| Parameter | Your Value | Reference | Status |
|---|
Reference values represent WHO lower reference limits for fertile men. Values below these do not necessarily indicate infertility.
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A semen analysis is a laboratory assessment of a single ejaculated sample. It measures several parameters that together describe sperm production and function: how much fluid was produced, how many sperm are present, how well they move, and how many have normal shape. Labs typically report these numbers after 2 to 5 days of abstinence, examined within an hour of collection. The test isn’t a fertility diagnosis on its own, it’s one data point among several, and abnormal results are usually repeated before any clinical conclusion is drawn.
A semen analysis produces six to ten numbers on a lab report, and each one means something different. Volume isn’t the same as concentration. Total motility isn’t the same as progressive motility. Morphology is assessed under strict criteria that changed between 2010 and 2021. Reading the report line by line without a reference frame is hard.
This calculator gives you that frame. It checks each parameter against the WHO reference limits, flags any that fall below, and groups them into a plain-language verdict. When a pattern of low parameters shows up together, it names the condition: oligozoospermia for low concentration, asthenozoospermia for low motility, teratozoospermia for abnormal morphology. Those are clinical terms, not diagnoses, and only a fertility specialist can interpret them in context.
How to Use the Sperm Analysis Calculator
Pick your WHO reference standard from the dropdown at the top.
Enter semen volume and choose your unit from the dropdown.
Add sperm concentration. Unit options cover M/mL, M/µL, cells/mL, and cells/µL.
Type total motility, progressive motility, morphology, and vitality as percentages.
Expand the advanced panel to add total count, pH, WBC, or liquefaction time if your report includes them.
Leave any field blank to exclude it from the assessment.
Read the verdict box for the overall assessment.
Toggle the Detailed Assessment tab for a row-by-row breakdown with reference ranges and status badges.
Formula: Status = comparison of each parameter against the WHO reference limit for that parameter
Every parameter uses one of two comparison rules. Most are lower limits, where higher is better:
Formula (lower limit): Normal if value ≥ reference. Borderline if value is between 85% and 100% of reference. Below if under 85%.
Two parameters are upper limits, where higher is worse:
Formula (upper limit): Normal if value < reference. Borderline if value is between 1× and 1.5× reference. Below if over 1.5× reference.
The tool supports unit conversion across every field. Volume handles mL, µL, cc, litres, and fluid ounces. Concentration and WBC handle millions per millilitre, millions per microlitre, cells per millilitre, and cells per microlitre. Total count handles million, billion, thousand, and raw cells. Liquefaction handles minutes, seconds, and hours. Every value is normalised to the base unit before assessment.
The overall verdict uses the count of abnormal parameters. Zero abnormal or borderline parameters reads as normal. All borderline reads as mildly reduced. One abnormal reads as a single abnormality. Two abnormal reads as multiple. Three or more reads as significant. Condition patterns are detected by scanning the abnormal flags: azoospermia for zero concentration, oligozoospermia for low concentration, asthenozoospermia for low motility, teratozoospermia for low morphology.
Say your lab report shows the following numbers under WHO 2021 standards:
Volume: 2.2 mL (reference 1.4 mL)
Concentration: 28 M/mL (reference 16 M/mL)
Total motility: 45% (reference 42%)
Progressive motility: 32% (reference 30%)
Morphology: 3% (reference 4%)
Vitality: 62% (reference 54%)
Run through the assessment:
Volume: 2.2 ≥ 1.4 → normal
Concentration: 28 ≥ 16 → normal
Total motility: 45 ≥ 42 → normal
Progressive motility: 32 ≥ 30 → normal
Morphology: 3 < 4 → below 85% of reference? No, 3 is 75% of 4 → abnormal
Vitality: 62 ≥ 54 → normal
Five of six parameters are normal. One is abnormal, so the verdict reads “Single Abnormality Detected.” The pattern detector flags teratozoospermia, since only the morphology parameter fell below reference. The recommendation in that case is usually a repeat analysis after two to four weeks, since morphology can vary between samples and one abnormal parameter on one test doesn’t confirm a problem.
If you switch the same numbers to WHO 2010 standards, nothing changes for morphology (reference 4% in both editions). But if total motility were 41%, WHO 2021 would flag it as borderline and WHO 2010 would flag it as normal, since the 2010 reference for total motility is 40%.
Under WHO 2021 standards, normal sperm concentration is at least 16 million per millilitre, and total sperm count is at least 39 million. Under WHO 2010, the concentration threshold is 15 million per millilitre.
Total motility below 42% (WHO 2021) or 40% (WHO 2010) is considered low. Progressive motility has a separate cutoff of 30% or 32%. Low motility can reduce the number of sperm reaching the egg, but many men with low motility still conceive.
Normal morphology below 4% is the WHO threshold for both 2010 and 2021 editions. Only 4% of sperm need to look normal for the sample to meet reference. Morphology is assessed under strict Kruger criteria.
The 2021 edition slightly adjusted several limits. Volume dropped from 1.5 to 1.4 mL, concentration rose from 15 to 16 M/mL, total motility rose from 40% to 42%, and vitality dropped from 58% to 54%.
Oligozoospermia means low sperm concentration, below the WHO reference limit. Severity is graded from mild (10–15 M/mL) to very severe (under 1 M/mL).
Asthenozoospermia means low sperm motility. It’s defined as total motility below 42% or progressive motility below 30% under WHO 2021 standards.
Azoospermia means no sperm are present in the ejaculate. It always warrants a specialist referral and is usually evaluated with a repeat analysis, hormone testing, and sometimes genetic screening.
Abstain from ejaculation for 2 to 5 days before the test. Shorter reduces count, longer increases dead sperm. Avoid alcohol, saunas, and hot tubs for a week beforehand. Collect at the lab when possible.
Yes. The WHO reference limits represent the lower end of the range observed in fertile men, and about 5% of fertile men fall below them. Many borderline results still result in natural conception.
Yes. Semen parameters vary significantly between samples due to stress, illness, timing, and other factors. Two or three samples spaced two to four weeks apart give a more reliable picture than a single test.
Progressive motility counts only sperm moving in a forward direction. It’s a stricter measure than total motility, which counts any movement. Progressive motility has its own WHO reference of 30% (2021) or 32% (2010).
The calculator interprets the numbers your lab reports. Accuracy depends on the lab’s analysis quality, not the calculator. Home test kits vary widely in reliability and often assess only concentration, not motility or morphology.
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