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Calcimator

Vent Design Calculator

Calculate vent depth, width, land length, and placement for proper air evacuation in injection molds.

Inputs

mm
mm

Results

Vent Depth

0.03 mm

Vent Width10 mm
Vent Land Length1 mm
Relief Channel Depth0.63 mm
Recommended Vent Count10
Total Vent Area2 mm²
Vent Spacing50 mm
Venting Adequacy80%
How to Use This Calculator
  1. Select material type to auto-populate recommended vent depth for that resin.
  2. Enter part perimeter at the parting line (mm), nominal wall thickness (mm), and desired number of vents.
  3. Review recommended vent depth (mm), vent width (mm), land length, and relief channel depth.
  4. Compare recommended vent count to your planned count — insufficient venting causes burns and short shots.
  5. Space vents evenly around the parting line and always add vents at weld-line locations.

What each input means

Material Type
Material determines maximum vent depth to prevent flash.
Part Perimeter
Perimeter of the part at the parting line.
Nominal Wall Thickness
Nominal wall thickness to help size vent width.
Number of Vents
Planned number of parting line vents.

What each result means

Vent Depth
Maximum vent depth — exceeding this causes flash.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Material Type = 2, Part Perimeter = 400, Nominal Wall Thickness = 2.5, Number of Vents = 8 = 4 input(s) provided
  2. Calculate Vent Depth
    Vent Depth
    0.025 = 0.025
  3. Calculate Vent Width
    Vent Width
    10 = 10
  4. Calculate Vent Land Length
    Vent Land Length
    1 = 1

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