Prosthetic Socket Sizing Calculator

Calculate prosthetic socket dimensions including circumference reduction, length, wall thickness, and material recommendation based on activity level.

Inputs

Residual Limb Circumference (cm)

Residual Limb Length (cm)

Activity Level

Socket Type

Tab to move between fields

Results

Socket Circumference

33.3 cm

≈ 4 credit cards

Socket Length18 cm

Wall Thickness4 mm

Circumference Reduction5%

Recommended Material2

How to Use This Calculator

Measure the residual limb circumference in cm at the most distal point.
Measure the residual limb length in cm from the anatomical reference point.
Select the patient's activity level (K-level 1–4).
Choose the socket type (transtibial, transfemoral, etc.).
Review the recommended socket dimensions as a starting fit reference — confirm with a certified prosthetist.

How the result changes with Residual Limb Circumference (cm)

Residual Limb Circumference (cm)	Socket Circumference
17	16.2 cm
35	33.3 cm
56	53.2 cm
73	69.4 cm

What each input means

Residual Limb Circumference (cm): Measured circumference at the widest point of the residual limb.
Residual Limb Length (cm): Length from the end of the limb to the joint crease.
Activity Level: 1 = low (household), 2 = moderate (community), 3 = high (athletic/occupational).
Socket Type: 1 = PTB (patellar tendon bearing), 2 = TSB (total surface bearing), 3 = suction.

What each result means

Recommended Material: 1 = thermoplastic, 2 = carbon fiber, 3 = advanced composite.

How this is calculated

Worked example, using the default values

Identify Input Parameters
4 parameters
Residual Limb Circumference (cm) = 35, Residual Limb Length (cm) = 20, Activity Level = 2, Socket Type = 2 = 4 input(s) provided
Calculate Socket Circumference
Socket Circumference
33.3 = 33.3
Calculate Socket Length
Socket Length
18 = 18
Calculate Wall Thickness
Wall Thickness
4 = 4