Amniotic Fluid Index Calculator
Reviewed by Hamza Gujjar, Algorithm Architect & Software Developer
Last updated: July 27, 2026
Disclaimer: This calculator is provided for informational and educational purposes only and does not constitute financial, medical, legal, or other professional advice. Always consult a qualified professional before making decisions based on these results.
Reading an ultrasound fluid assessment
Amniotic Fluid Index is measured by ultrasound, summing the deepest vertical fluid pocket in each of four uterine quadrants into one combined figure used to screen for abnormally low or high amniotic fluid levels.
Worked example
For an AFI of 12 cm:
Result = 12.0 cm (Normal range)
| AFI | Classification |
|---|---|
| Below 5 cm | Oligohydramnios (low fluid) |
| 5-24 cm | Normal range |
| Above 24 cm | Polyhydramnios (high fluid) |
Both abnormally low and high fluid levels warrant further clinical evaluation, since either can be associated with a range of underlying conditions depending on gestational age and overall clinical picture. This is an informational tool only, not a substitute for evaluation by a qualified healthcare provider.