Enter the sprue area, runner area, and total gate area into the calculator to determine the gating ratio.

Gating Ratio Formula

The following equation is used to calculate the Gating Ratio.

GR = 1 : AR/AS : AG/AS
  • Where GR is the 3-term grating ratio
  • AS is the sprue area
  • Ar is the runner area
  • Ag is the gate area

What is a Gating Ratio?

Definition:

A gating ratio is a term used to describe the relative cross-sectional areas of components of a gating system.

How to Calculate Gating Ratio?

Example Problem:

The following example outlines the steps and information needed to calculate the Gating Ratio.

First, determine the area of the spue. In this case, this is 10ft^2.

Next, determine the area of the runner. In this example, this is 20ft^2.

Next, determine the area of the gate. This is 40ft^2.

Finally, calculate the gating ratio using the formula above:

GR = 1 : AR/AS : AG/AS

GR = 1 : 20/10 : 40/10

GR = 1 : 2 : 4