AFT Calculator
Calculate the Ankle-Foot-Thigh (AFT) ratio to assess lower limb proportion in physical therapy and clinical evaluations.
Formula
AFT Ratio = Ankle ÷ Thigh circumference
- Normal ankle/thigh ratio is approximately 0.40–0.45.
- Measurements should be taken at the widest/narrowest point of each segment.
- Used in sports science and physical therapy for limb symmetry analysis.
Ankle 22 cm, Calf 36 cm, Thigh 52 cm
Inputs
- Ankle Circumference: 22 cm
- Calf Circumference: 36 cm
- Thigh Circumference: 52 cm
AFT = 22/52 = 0.423. Calf/Thigh = 36/52 = 0.692. Ankle/Calf = 22/36 = 0.611.
Frequently asked questions
What does the AFT ratio indicate?
It measures the proportionality of lower limb circumferences, used in assessing edema, muscle development, or body composition.
How should I measure circumferences?
Ankle: narrowest point above the ankle bone. Calf: widest point. Thigh: at the gluteal fold.
What is a normal value?
Ratios vary by individual; this tool is most useful for comparing bilateral symmetry (left vs right limb).
Is this a diagnostic tool?
No — this is an informational tool only. Consult a physiotherapist for clinical assessment.