Amniotic Fluid Index (AFI)
Amniotic Fluid Index: the sum of the deepest vertical fluid pocket in each of the four uterine quadrants (cm); under 5 cm oligohydramnios, over 24 cm polyhydramnios.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Quadrant 1 pocket depth
- 1 cm
- Quadrant 2 pocket depth
- 1 cm
- Quadrant 3 pocket depth
- 1 cm
- Quadrant 4 pocket depth
- 1 cm
Result: AFI 4.0 cm: oligohydramnios (below 5 cm).
The tool opens with these values already filled in. Replace them with your own.
What the result means
- < 5 cm
- Oligohydramnios.
- 5 to 8 cm
- Low-normal.
- > 24 cm
- Polyhydramnios (some references use > 25 cm).
What you enter
- Quadrant 1 pocket depth
- Quadrant 2 pocket depth
- Quadrant 3 pocket depth
- Quadrant 4 pocket depth
How this is calculated
Moore TR, Cayle JE. The amniotic fluid index in normal human pregnancy. Am J Obstet Gynecol. 1990;162(5):1168-1173. Oligohydramnios < 5 cm, polyhydramnios > 24 cm (ACOG thresholds). Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.