Normal Size Of Kidney Stones. Size of the stone is a major factor in whether it can pass naturally. Some conditions can affect the size of these organs a red flag for our doctor that something is amiss.
Kidney stones of less than 5mm are considered to be small. A normal sized kidney for an adult ranges between 9 and 12 centimetres which is according to some experts very similar to the size of a fist. Normal kidney size of adults when fully developed the kidneys are roughly the size of a fist.
A kidney stone is likely considered too large to pass on its own if it is larger than 5 8 mm in size.
Kidney stones of less than 5mm are considered to be small. Stones smaller than 4 millimeters mm pass on their own 80 percent of the time. 4mm size stones have 80 chances to pass through the kidneys in about a month but 5mm size stones have 60 chances of passage in about 45 days. Stones that are smaller than 4 millimeters mm pass on their own in about 30 days on an average.