Normal Liver Size in CM by Age: A Chart for All Ages

A healthy liver measures roughly 5 to 6 cm in a newborn and grows to about 14 to 16 cm in most adults, with the exact figure depending mainly on a person’s height, sex, and body surface area rather than age alone. That wide span reflects the liver’s remarkable growth curve: it nearly triples in length during the first few years of life, then slows dramatically, and eventually shrinks a bit in older age. The numbers below draw on ultrasound-based studies and CT data, so it helps to understand what the measurements actually capture and where the normal range breaks down.

How Liver Size Is Typically Measured

When a radiologist reports your liver’s length in centimeters, they almost always mean the craniocaudal (top-to-bottom) span of the right lobe measured along the midclavicular line, which is the imaginary vertical line dropped from the midpoint of the collarbone. The sonographer places the ultrasound probe longitudinally at that landmark and measures from the dome of the liver at the diaphragm down to the lower tip.¹ This single-dimension approach is not the same as measuring total liver volume, which requires CT or MRI slicing through dozens of cross-sections, but it is the most practical screening tool available. Virtually all the “normal liver size” values you will encounter in a chart are this midclavicular-line span.

One practical caveat: ultrasound tends to underestimate the craniocaudal dimension compared with CT. A study comparing both modalities found a mean difference of about 3.6 cm in the craniocaudal direction, with ultrasound reading smaller.² In children aged 1 to 12, however, CT and ultrasound liver-span measurements showed no significant difference.³ The takeaway: if you are comparing a child’s ultrasound reading against a pediatric reference chart built from ultrasound data, the numbers are reliable. If an adult’s ultrasound result is being compared against a CT-derived threshold, the discrepancy can matter.

Normal Liver Size in Children, Birth Through 18

Pediatric liver growth is fast and then slow. From birth to about age three, the right lobe grows at roughly 1 cm per year. After that, growth decelerates to about 0.33 cm per year through adolescence.⁴ A large diverse-population study found that at birth the liver measures about 4.9 to 5.5 cm, rising progressively to a maximum of about 17.2 cm by age 17 to 18.⁵

The table below shows mean values and 5th-to-95th-percentile ranges for the right lobe craniocaudal diameter, measured by ultrasound in a Central European pediatric cohort.⁴

0–1 month: mean 6.2 cm (5th–95th percentile: 5.2–8.0 cm)
1–6 months: mean 6.8 cm (5.2–8.3 cm)
6–12 months: mean 7.9 cm (5.4–10.0 cm)
1–2 years: mean 8.4 cm (6.2–10.3 cm)
2–3 years: mean 8.8 cm (7.1–10.8 cm)
3–4 years: mean 9.6 cm (8.3–11.0 cm)
4–5 years: mean 9.9 cm (8.8–11.2 cm)
5–6 years: mean 10.5 cm (8.9–12.1 cm)
6–7 years: mean 10.9 cm (9.2–13.0 cm)
7–8 years: mean 11.0 cm (9.2–12.7 cm)
8–9 years: mean 12.0 cm (9.9–14.8 cm)
9–10 years: mean 12.0 cm (10.2–13.6 cm)
10–11 years: mean 12.2 cm (10.5–13.7 cm)
11–12 years: mean 12.2 cm (10.2–14.3 cm)
12–13 years: mean 12.5 cm (10.5–14.8 cm)
13–14 years: mean 13.5 cm (11.9–15.6 cm)
14–15 years: mean 13.7 cm (11.6–15.8 cm)
15–16 years: mean 13.4 cm (9.4–15.9 cm)
16–18 years: mean 14.3 cm (12.2–16.4 cm)

Notice that the normal range within any age group spans several centimeters. A seven-year-old might have a liver measuring 9.2 cm or 12.7 cm and both are within the 5th-to-95th percentile band. That wide scatter is exactly why pediatricians increasingly prefer to plot liver size against height rather than age: height-based charts produce a tighter, more linear relationship.⁵ If your child’s report says the liver is “large for age” but the child is tall for their age, the finding may mean nothing at all.

Normal Liver Size in Adults

In healthy adults, the average midclavicular-line liver span on ultrasound is about 15 cm. A study measuring this span found the overall average at 15.0 ± 1.5 cm, with women averaging 14.9 cm and men 15.1 cm.⁶ That male-female gap is surprisingly small on ultrasound. A commonly cited “normal” cutoff of around 15 to 16 cm on ultrasound holds reasonably well for most adults, though taller people will naturally sit toward the upper end.

CT-based measurements tend to return larger numbers because of how slices capture the full liver contour. One CT study in a Saudi population reported a 5th-to-95th percentile range for the maximum craniocaudal liver span of 13.8 to 21.6 cm.⁷ Those numbers look alarmingly large if you compare them against a 15 cm ultrasound average, but the discrepancy is mostly methodological: CT and ultrasound are measuring slightly different things, as noted above. When your doctor orders an ultrasound, the comparison chart should come from ultrasound data, and when a CT is used, CT-derived norms are appropriate.

Why Height and Body Surface Area Matter More Than Age

Throughout childhood and into adulthood, body size is a stronger predictor of liver size than calendar age. The pediatric studies above found that the relationship between liver dimensions and body height was more linear than the relationship with age, because age only loosely tracks physical size (a small five-year-old and a tall five-year-old can differ by 20 cm in height).⁴ In adults, body surface area is probably the single best anthropometric predictor of liver volume.

An important related question: does obesity inflate liver size? One validation study looking at liver volume in children with overweight and obesity found that liver volume tracked body surface area, not BMI. In other words, a bigger child has a proportionally bigger liver because they have more overall body, not because they are carrying excess fat.⁸ That said, this applies to normal-organ scaling. Fatty liver disease is a separate condition that genuinely enlarges the liver beyond what body size would predict, as discussed further below.

How Sex and Aging Change Liver Size After Midlife

The small ultrasound-measured difference between adult men and women masks a more nuanced pattern in total liver weight. Autopsy data from over 700 cases showed that in men, liver weight peaks between about ages 41 and 50, then declines. In women, liver weight keeps rising until ages 51 to 60 before it, too, starts falling. Because the male liver begins shrinking earlier while the female liver is still growing, the sex-based difference in liver weight essentially disappears above age 50.⁹

After that midlife peak, both men and women gradually lose liver mass. This age-related shrinkage affects drug metabolism because the liver is responsible for processing a large share of the medications you take. A smaller liver with reduced blood flow clears drugs more slowly, which is why many medications require dose adjustments in older adults. Research has long recognized changes in liver size and hepatic blood flow as the main reason drug elimination declines with age.

Fetal Liver Size

The liver is one of the first organs a prenatal ultrasound can measure, and it grows steadily throughout pregnancy. A study tracking fetal liver length from 14 to 40 weeks of gestational age found a strong linear relationship: each additional week adds roughly 1.6 mm of liver length, starting from a predicted size of about 16 mm at 14 weeks and reaching approximately 57 mm by 40 weeks.¹⁰ Obstetricians track fetal liver size because abnormally large or small values can signal conditions like fetal anemia, infection, or metabolic disease.

How Pregnancy Temporarily Enlarges the Liver

Pregnancy increases liver size well beyond what the mother’s changing body weight alone would predict. MRI measurements showed that, on average, liver volume grew about 15% from early to late pregnancy, increasing from roughly 1,239 cm³ to about 1,421 cm³.¹¹ This expansion appears to be driven by a hormone-mediated program tied to reproductive state, not simply by general weight gain. The liver returns to its baseline size after delivery and weaning. If you are pregnant and your imaging shows a liver span a few centimeters larger than expected, this growth is likely physiological and normal.

Breathing Phase and Other Measurement Quirks

If you have ever had an abdominal ultrasound, you know the technician keeps asking you to hold your breath. That is because the diaphragm pushes the liver downward when you inhale, which changes the apparent span. Studies confirm that the intercostal measurement window widens at end-inspiration and that measurements can shift depending on respiratory phase.¹² A difference of a centimeter or two between two scans done on different days could simply reflect how deeply you breathed in.

Eating, on the other hand, barely matters. A study measuring liver volume before and after a meal found that food intake only marginally affected liver size, well within the error margin of the imaging technique.¹³ So you do not need to fast specifically to get an accurate liver-size measurement, though many ultrasound departments ask you to fast for other reasons (like better visualization of the gallbladder).

When Your Doctor Feels for Your Liver

Before imaging existed, doctors relied on palpation and percussion to estimate liver size. Many still do a quick feel during a physical exam, pressing under the right ribcage and asking you to take a deep breath. The question is how accurate this is. Research concluded that the bedside examination of the liver does not provide any accurate information about the actual volume of the organ.¹⁴ What a physical exam can detect is the character of the liver’s lower edge: whether it is smooth or irregular, soft or firm. A hard, nodular edge might suggest cirrhosis even before imaging is ordered. So the exam is still clinically useful, just not for pinning down size in centimeters.

Fatty Liver Disease and What “Too Big” Actually Means

A liver measurement that exceeds the reference range is called hepatomegaly, and it sends doctors looking for a cause. The differential is broad: infection, congestion from heart failure, blood cancers, storage diseases, and metabolic conditions can all enlarge the liver. Among the most common causes today is non-alcoholic fatty liver disease (NAFLD), which affects a large and growing share of the adult population.

A study comparing liver size in NAFLD patients and healthy controls found the NAFLD group averaged about 149 mm (14.9 cm) compared with about 135 mm (13.5 cm) in controls, a gap of roughly a centimeter and a half.¹⁵ Liver size also tracked disease severity: mild, moderate, and severe fatty liver groups averaged about 144, 154, and 159 mm respectively. Age, sex, height, BMI, and the degree of fat infiltration all independently predicted liver size in that study.¹⁵

This is relevant because many people first learn about their liver size from a routine scan ordered for some other reason, like gallstones or abdominal pain. If the report says “hepatomegaly” or “liver measures 17 cm,” the natural instinct is alarm. But context matters. A tall adult male with no fatty liver could legitimately have a 17 cm span and be perfectly healthy. A shorter woman with the same measurement might warrant blood work and follow-up imaging. The number alone does not diagnose anything; it has to be interpreted alongside your body size, your lab results, and any symptoms.

Rare Causes of Liver Enlargement in Children

In pediatrics, an unexpectedly large liver warrants a broader diagnostic search. Beyond the common culprits like infections and heart conditions, hepatomegaly in a child can point toward lysosomal storage diseases, a group of rare inherited metabolic conditions with a collective frequency of roughly 1 in 5,000 live births. These conditions cause accumulation of unprocessed materials inside cells, progressively enlarging organs like the liver and spleen. Many are now treatable with enzyme replacement therapy, so early recognition matters. If a child’s liver measurements consistently fall above the 95th percentile and there is no obvious explanation like a viral illness, clinicians will often screen for these conditions alongside more common causes.

Putting the Numbers in Perspective

Reference charts are useful as a starting point, but they are population averages, not personal thresholds. A measurement slightly above or below the range does not automatically mean something is wrong. The two variables that shift the “normal” window the most are body height (or body surface area) and the imaging modality used. If you are comparing your result to a chart, match the modality: ultrasound values against ultrasound norms, CT values against CT norms. For children, height-based percentile curves give a sharper answer than age-based tables, because two children of the same age can differ dramatically in body size.⁵ For adults, the roughly 15 cm ultrasound average is a reasonable benchmark, but your height and sex are always part of the equation. And for anyone over 50, some degree of liver shrinkage is expected, which can actually be reassuring if a scan shows a slightly smaller organ than you anticipated.

1
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Scientific Reports. Reliability and accuracy of straightforward measurements for liver volume determination in ultrasound and computed tomography compared to real volumetry
3
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PubMed Central. Normal sonographic liver and spleen dimensions in a central European pediatric population
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PubMed Central. Are body surface area based estimates of liver volume applicable to children with overweight or obesity? An in vivo validation study
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PubMed. Estimation of liver size for liver transplantation: the impact of age and gender
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PubMed. Normal length of the fetal liver from 14 to 40 weeks of gestational age
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PubMed Central. Pregnancy and weaning regulate human maternal liver size and function
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PubMed Central. Determining the ideal measurement site and respiratory condition for liver transient elastography: toward clinical practice standardization
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PubMed. Effect of food intake on liver and spleen volume: assessment with single photon emission computed tomography
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PubMed. Physical examination of the liver: is it still worth it?
15
PubMed Central. Comparison of size of the liver between patients with non-alcoholic fatty liver disease and healthy controls