Skip to main content
Calcimator

Silicone Mold Calculator

Calculate the volume of silicone rubber needed to make a mold by subtracting the master object volume from the mold box volume.

Inputs

in
in
in
cu in

Results

Silicone Needed (with 5% overage)

94.24 oz

≈ 24 sticks of butter

Silicone (exact)89.75 oz
Silicone (gallons)0.7 gal
Silicone Weight7.22 lbs
Box Volume192 cu in
Silicone Volume162 cu in
Master Displacement15.6%
Wall OkYes
How to Use This Calculator
  1. Enter the internal dimensions of your mold box (length, width, and height) in inches.
  2. Enter the approximate volume of the master object you are molding in cubic inches.
  3. Read the silicone needed in ounces with 5% overage — this accounts for the space not displaced by the master.
  4. Use the silicone gallons output when ordering by volume from a supplier.
  5. Compare the estimated cost output against your budget before purchasing silicone.

How the result changes with Mold Box Length

Mold Box LengthSilicone Needed (with 5% overage)
5.762.13 oz
17219.88 oz
32429.29 oz
43582.87 oz

What each input means

Mold Box Length
Interior length of the mold box. Add at least 0.5 inches on each side beyond the master object.
Mold Box Width
Interior width of the mold box. Ensure at least 0.5 inches of silicone wall thickness on all sides.
Mold Box Height
Interior height of the mold box. Should be at least 0.5 inches taller than the master object.
Master Object Volume
Volume of the master object being molded. You can estimate this by water displacement or by approximating the shape dimensions.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Mold Box Length = 8, Mold Box Width = 6, Mold Box Height = 4, Master Object Volume = 30 = 4 input(s) provided
  2. Calculate Silicone Needed
    Silicone Needed
    94.24 = 94.24
  3. Calculate Silicone
    Silicone
    89.75 = 89.75
  4. Calculate Silicone
    Silicone
    0.701 = 0.701

Related Calculators

The questions that sit next to this one — chosen by subject, including calculators filed under a different category.

Resin & Epoxy

Epoxy Volume Calculator

Calculate the exact amount of resin and hardener needed for a rectangular mold based on dimensions and mix ratio.

Resin & Epoxy

Pressure Pot Sizing Calculator

Determine the minimum pressure pot diameter, height, and PSI needed for bubble-free resin castings based on your largest mold size.

Sculpture

Mold Making Calculator (Sculpture) Calculator

Estimate silicone rubber volume, mother mold materials, and cost for sculpture mold making.

Resin & Epoxy

Embedment Calculator

Calculate the net resin needed after accounting for the volume displaced by embedded objects like flowers, coins, or wood pieces.

More in Crafts, Hobbies & Games.