Normal kidney size in adults

Last revised by Ciléin Kearns on 19 Jan 2023

Normal kidney size in adults is closely related to height, but weight, body mass index (BMI), age, and ethnicity can also influence this 4.

Kidney dimensions are typically measured sonographically and used to calculate estimated volume. MRI and CT measurements have been shown to generally correlate well with ultrasonography 5,6.

The mean average pole-to-pole length of an adult human kidney is 10-13 cm. In general, the left kidney is slightly longer than the right.

When one kidney has reduced function or is absent, the other may undergo compensatory enlargement 7.

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