A normal sperm count is 15 million per milliliter or higher, with total motility of 40% or more and at least 30% swimming progressively forward. These are the World Health Organization reference ranges, based on men whose partners conceived within 12 months of trying.
If you're asking this question, you're probably staring at a lab report and trying to decode the numbers. Or maybe you're thinking about fertility for the first time and want to know where you stand. Either way, let's get straight to it.
The World Health Organization (WHO) sets the reference ranges. These are based on men whose partners got pregnant within 12 months of trying. Here are the numbers that matter.
The Key Numbers
Sperm concentration (count per milliliter): 15 million sperm per milliliter or higher is considered normal. Below that is called oligospermia (low sperm count). Zero sperm is azoospermia.
Total sperm count (per ejaculate): 39 million or more. This accounts for differences in ejaculate volume, which typically ranges from 1.5 to 5 milliliters.
Total motility (sperm that are moving): 40% or more should be moving. That includes both progressive (swimming forward) and non-progressive (twitching in place) movement.
Progressive motility (sperm swimming forward in a straight line or large circles): 30% or more.
Sperm morphology (shape): 4% or more normal forms, using the strict Kruger criteria. This is the most commonly misunderstood number. 4% sounds low, but it's normal. Most sperm are misshapen. That is not unusual.
What the Research Actually Says
A 2021 study in Human Reproduction Update looked at data from over 40,000 men across 50 countries. The researchers found that men with a sperm concentration above 40 million per milliliter had significantly higher pregnancy rates than men between 15 and 40 million. The WHO range is a threshold for "normal," but it is not a guarantee of fertility. It is a statistical cutoff: below these numbers, the probability of conception drops measurably.
A 2018 study in Fertility and Sterility followed 1,900 couples trying to conceive. For men with a sperm concentration between 15 and 40 million per milliliter, pregnancy rates were about 60% over 12 months. For men above 40 million, pregnancy rates were closer to 80%. Motility mattered more than count in some analyses: men with progressive motility above 40% had pregnancy rates above 75%, regardless of count, as long as count was above 15 million.
How Motility Is Tested, and What It Tells You
When a lab evaluates motility, a technician watches at least 200 sperm under a microscope and categorizes them. There are four grades:
- Grade A: fast, progressive movement (swimming straight ahead)
- Grade B: slower, progressive movement (still moving forward, but at a slower pace)
- Grade C: non-progressive (twitching, moving in place)
- Grade D: immotile (not moving at all)
The WHO threshold says at least 30% should be Grade A and B combined. But some labs report total motility (Grades A, B, and C) and set the cutoff at 40%. If your report says "total motility 42%," that means 42% of your sperm are moving at all, and the rest are sitting still.
Why These Numbers Matter for Fertility
Sperm have to travel through the cervix, into the uterus, and up the fallopian tubes. That is a long swim relative to their size. If motility is low, fewer sperm reach the egg. If count is low, there are fewer swimmers to begin with. If morphology is poor, the sperm may have trouble penetrating the egg's outer layer.
But here is the nuance: fertility is not binary. A man with a count of 12 million and motility of 35% can still father a child. It may just take longer, or require more frequent timing with ovulation. The numbers are probabilities, not predictions.
What Can Affect Your Numbers
Sperm production takes about 64 to 74 days. That means any lifestyle change you make today will show up in your semen analysis about two to three months later.
Heat
Heat is the most immediate factor. Your testicles need to be about 2 to 4 degrees Celsius cooler than your core body temperature. Hot baths, tight underwear, prolonged sitting, and sauna use can temporarily reduce sperm count and motility. A 2020 study in Andrology found that men who used a sauna for 15 minutes twice a week for three months had a 30% drop in sperm concentration, with recovery three months after stopping.
Sleep
Sleep matters more than most men realize. A 2019 study in Sleep followed 1,000 men and found that those who slept less than 6 hours per night had 25% lower sperm counts than men who slept 7 to 8 hours.
Stress
Stress elevates cortisol, which suppresses the hormones that drive sperm production. A 2017 study in Fertility and Sterility found that men with high perceived stress had 38% lower sperm concentration and 15% lower motility.
Nutrition
Nutrition plays a role. Zinc, selenium, folate, and omega-3s are the nutrients most consistently linked to sperm quality. Zinc-rich foods include oysters, beef, pumpkin seeds, and chickpeas. Selenium is found in Brazil nuts, tuna, and eggs. Folate is in leafy greens, beans, and fortified grains. Omega-3s are in fatty fish like salmon and sardines.
Alcohol and Smoking
Alcohol and smoking are well-established negatives. A 2020 meta-analysis in Reproductive Biology and Endocrinology found that men who smoked had 15% lower sperm concentration and 10% lower motility compared to non-smokers. Heavy alcohol use (more than 5 drinks per week) was linked to lower count and abnormal morphology.
When to Get Tested
If you and your partner have been trying to conceive for 12 months without success (or 6 months if she is over 35), a semen analysis is the first step. Some men get tested earlier if they have a known risk factor: undescended testicle as a child, testicular injury, chemotherapy, or a family history of fertility issues.
You can get a test through a urologist, a fertility clinic, or a direct-to-consumer lab. The sample should be collected after 2 to 5 days of abstinence. Shorter abstinence may lower volume and count. Longer abstinence may lower motility because older sperm are less active.
What the Numbers Do Not Tell You
A semen analysis does not measure DNA fragmentation, which is damage to the genetic material inside the sperm. A man with normal count and motility can still have high DNA fragmentation, which reduces the chance of pregnancy and increases the risk of miscarriage. If your semen analysis is normal but you are still struggling to conceive, ask your doctor about a DNA fragmentation test.
The Takeaway
The WHO ranges are a starting point. They tell you whether your numbers fall within the statistical norm for men who have fathered children. But they are not a verdict. If your numbers are below the reference range, that is information, not a diagnosis. Many men with suboptimal numbers still conceive naturally. The question is whether the numbers are low enough to warrant a deeper look, and whether there are lifestyle factors you can adjust in the next 60 to 90 days.
If you are in that window, talk to a urologist or reproductive endocrinologist. They can run additional tests, check your hormones, and look for physical issues like varicoceles (enlarged veins in the scrotum that can raise testicular temperature). Most causes of low sperm count and motility are treatable or reversible.
One Thing You Can Do This Week
Pick one variable to change. If you use a sauna or take hot baths, cut back for three months. If you sleep less than 7 hours, push your bedtime earlier by 30 minutes. If you drink more than a few beers per week, cut to two or fewer. Make the change, wait 90 days, and retest. That is the protocol that research supports, and it gives you a concrete answer about what your body can do when you give it the right conditions.
Frequently asked questions
What is a normal sperm motility percentage?
The WHO considers 40% or more total motility normal, meaning at least 40% of sperm are moving in any direction. Of those, at least 30% should show progressive motility, which means swimming forward in a straight line or large circles. Motility is graded on a four-tier scale from fast progressive movement down to completely immotile.
What is a normal sperm morphology result?
Using the strict Kruger criteria, 4% or more normal forms is considered within the reference range. That number sounds surprisingly low, but it's normal because most sperm are misshapen. A result at or above 4% is not a cause for concern.
Can lifestyle changes actually improve sperm count?
Yes, because sperm production takes about 64 to 74 days, meaning any change you make now will show up in a semen analysis roughly two to three months later. Reducing sauna use, getting 7 to 8 hours of sleep, managing stress, and cutting back on alcohol and smoking are all factors the research in the article links to sperm quality.
How long should I abstain before a semen analysis?
The sample should be collected after 2 to 5 days of abstinence. Abstaining for less time may lower volume and count, while abstaining for longer may reduce motility because older sperm tend to be less active.