Cosmetic, Personal Care, and HI&I In-Bottle Formulation Cost Calculator

Converting Package Size from Volume to Weight

Topic:

If you’re current package fill is in mL or fl oz, you need convert the packaging size to weight (ounces) [Tip: use the mL value]. To convert, take the density (Density = mass/volume) of your formula (g/ml or g/cm^{3}) and multiply by 0.0353 — the result is your converted package size to ounces.

Example #1:

Your current/target package size is 100 mL

Use a beaker with progressive volume readings (i.e. 20 mL, 100 mL, 200 mL, etc) and place the beaker on a gram scale, once the beaker has been placed on the scale “tare” the scale [this will zero out the weight as if nothing is currently on the scale]

Begin pouring your liquid finished formulation into the beaker until you reach a level volume reading (20 mL, 100 mL, or 200 mL – doesn’t matter, just make sure the liquid lines up with a number). Let’s say you stopped filling at 20 mL

Once you’ve reached the 20 mL level, record the “grams” reading on the scale – let’s say it read 16.6 grams

This gram number is your “numerator” and the 20 mL you poured to is your “denominator”

16.6 grams / 20 mL = .83 g/ml (density) [Remember: Mass / Volume = Density]

Now, take that density value (.83 g/ml) and multiply it by your current/target package size – ours in this example was 100 mL

.83 g/mL x 100 mL = 83 grams (the mL’s go away/cancel out)

Now convert your grams value to ounces [ 1 Gram = 0.0353 oz]

83 grams x 0.0353 = 2.93 ounces

Success! For this formula, you now know that 100 mL also equals 2.93 ounces (weight) and you can plug this into the calculator

Example #2:

Your current/target package size is 500 mL

Put your lab beaker on the scale first and then tare the reading (zero out the scale)

You pour your finished formulation into the beaker and stop filling at 100 mL

Once poured to 100 mL, the gram value was 69.76

69.76 grams / 100 mL = .6976 g/ml (density)

Now, we do Density x Package Size

.6976 g/mL x 500 mL = 348.80 grams

Now convert your gram value to ounces [1 Gram = 0.0353 oz]

348.80 grams x 0.0353 = 12.31 ounces

Success! For this formula, you now know that 500 mL also equals 12.31 ounces (weight) and you can plug this into the calculator