2 Samuel 14:26

And when he cut the hair of his head—he shaved it every year because his hair got so heavy—he would weigh it out to be two hundred shekels, according to the royal standard.

Note 200 shekels is approximately 5 pounds or 2.3 kilograms of hair.

BSB · Berean Standard Bible
And when he polled his head, (for it was at every year’s end that he polled it: because the hair was heavy on him, therefore he polled it:) he weighed the hair of his head at two hundred shekels after the king’s weight.
KJV · King James Version
When he cut the hair of his head (now it was at every year’s end that he cut it; because it was heavy on him, therefore he cut it), he weighed the hair of his head at two hundred shekels, after the king’s weight.

Note A shekel is about 10 grams or about 0.35 ounces, so 200 shekels is about 2 kilograms or about 4.4 pounds.

WEB · World English Bible
And when he cut the hair of his head (now it was at every year’s end that he cut it; because it was heavy on him, therefore he cut it); he weighed the hair of his head at two hundred shekels, after the king’s weight.
ASV · American Standard Version

Related passages

From the Treasury of Scripture Knowledge, grouped by the word they explain.

when he polled
2 Samuel 18:9; Isaiah 3:24; 1 Corinthians 11:14
two hundred shekels
If the shekel be allowed to mean the common shekel, the amount will be utterly incredible; for Josephus says that "two hundred shekels make five {minæ:}" and the {mina,} he says, "weighs two pounds and a half;" which calculation makes Absalom's hair weigh twelve pounds and a half! But it is probable that the king's shekel was that which Epiphanius and Hesychius say was the fourth part of an ounce, half a {stater,} or two drachms: the whole amount, therefore, of the 200 shekels is about 50 ounces, which make 4 lb. 2 oz. troy weight, or 3 lb. 2 oz. avoirdupois. This need not be accounted incredible, especially as abundance of oil and ointment was used by the ancients in dressing their heads. Josephus informs us, that the Jews also put gold dust in their hair.
Genesis 23:16; Leviticus 19:36; Ezekiel 45:9–14