Thyroid Volume Calculator

The Thyroid Volume Calculator estimates Total Thyroid Volume (mL) based on the width, height, and depth of your thyroid lobes. This tool helps patients and healthcare providers quickly assess gland size and detect potential enlargement. Whether you are reviewing an ultrasound report, monitoring a known condition, or screening for goiter, this calculator offers an instant, medically-recognized estimate.

Right Lobe Measurements

Width in centimeters (0.5 - 6.0 cm)
Height in centimeters (1.0 - 8.0 cm)
Depth in centimeters (0.5 - 3.0 cm)

Left Lobe Measurements

Width in centimeters (0.5 - 6.0 cm)
Height in centimeters (1.0 - 8.0 cm)
Depth in centimeters (0.5 - 3.0 cm)

Patient Information

Age in years (5 - 100 years)

How Total Thyroid Volume Is Calculated

Volume = (π/6) × Width × Height × Depth

Where:

  • Volume = Volume of a single thyroid lobe in milliliters
  • Width, Height, Depth = Lobe dimensions in centimeters

Total Thyroid Volume represents the three-dimensional physical size of your thyroid gland measured in milliliters. Since each lobe of the thyroid closely resembles the shape of an ellipsoid, we calculate volume using the standard ellipsoid formula.

  1. Measure the width, height, and depth of the right lobe and multiply them together.
  2. Repeat the multiplication for the left lobe dimensions.
  3. Multiply both results by Pi divided by 6 (approximately 0.5236) to get the volume in mL.
  4. Add the right lobe volume and left lobe volume together for the total.

This mathematical method is recommended by the World Health Organization and provides a reliable estimate typically within a 10-15% margin of error.

What Your Total Thyroid Volume Means

Your Total Thyroid Volume score tells you if your thyroid gland is a normal size or potentially enlarged (goiter).

Normal Thyroid Size: If your result falls between 8 and 18 mL for adults (or 3-10 mL for children), your gland size is likely healthy. This suggests normal development and adequate iodine levels. In this range, you usually only need routine monitoring during regular physical exams.

Enlarged Thyroid (Goiter): Results exceeding 18 mL for adult women or 25 mL for adult men indicate enlargement. This often signals iodine deficiency or autoimmune conditions. If your result is here, schedule an appointment with your doctor to check hormone levels and rule out nodules.

Monitoring Changes: If you are treating a thyroid issue, use this tool to track volume changes over time. A decrease in volume usually means treatment is working, while growth may require adjustments.

Important: This calculator is a screening tool, not a diagnostic device. It does not account for irregular nodules or the isthmus tissue. The information provided is for educational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.

Track your volume every 6 to 12 months or as directed by your endocrinologist to catch changes early.