normal size of thyroid lobe
1 The normal size of the thyroid gland in adults is 4 to 4.8 cm x 1.0 to 1.8 cm x 0.8 to1.6 cm. 2  Its normal weight ranges between 15-25 grams.3  The weight of this gland grows heavier in women. 4  It escalates up to 50% during the early part of the menstrual cycle.imension & Weight Of Thyroid Gland. 1  The normal size of the thyroid gland in adults is 4 to 4.8 cm x 1.0 to 1.8 cm x 0.8 to1.6 cm.