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Scaling up a formula from 100g to 2,000g
Posted by scelce on December 11, 2018 at 7:03 pmI’m new to cosmetic formulating and I was wondering if I have a formula at 100g and wanted to scale up to 2,000g, do I just multiply the ingredients by 2,000?
vjay replied 5 years, 2 months ago 10 Members · 13 Replies 
13 Replies

Let’s say that I’m using a broad spectrum preservative at 1%, I would just multiply that by 20 and use 20% in the 2,000 g batch?

Your formula should be for 100% not for 100 gr. Use MS Excel.

@scelce noooo 1% means “1 part for every 100 parts”. 1% stays 1% no matter what batch size, it doesn’t become 20% when you scale up. That’s the beauty of percents!
For a 100 gram scale, 1% of 100 is 1.
For a 2,000g scale, there are 20 groups of 100 (20*100=2000), so you multiply by 20. 1% of 2,000 is 20. 
@scelce
If you’re planning to make 100 gram batches and you want these to become 2 kilogram batches (2000 gram), you multiply the weights by 20 (20 x 100 gram = 2000 gram.)
But a better way is to calculate straight from the percentages of your formula. 1% of a preservative blend in a 100 gram batch can be calculated as follows:
Total is 100% = 100 grams. 100/100 * 1 = 1 gram.
 1% of a preservative blend in a 2000 gram batch:
Total is 100% = 2000 gram. 2000/100 * 1 = 20 grams.

Here is a video posted by @Perry that will give you a comprehensive review of wt./wt.% notation. https://chemistscorner.com/usefulformulatingspreadsheet/The link to the Excel Template he uses was also posted; https://chemistscorner.com/wpcontent/uploads/Formula%20template.xlsUsing this notation ensures accuracy in the scaleup and over time becomes much easier.


Doreen said:@em88
Or thisscelce said:Let’s say that I’m using a broad spectrum preservative at 1%, I would just multiply that by 20 and use 20% in the 2,000 g batch?@scelce
Are our previous explanations helpful for you? Can we help you any further with the calculation of weight/percentages?Indeed!
@scelce post your formula here and we will calculate it for you in grams for a 2000 g (2kg) batch. IMO this is a mandatory request, before you harm yourself/

Formulation wise you need to multiply by 20 but for process wise you need to monitor that how much time is require for heating and cooling , at how much RPM you need to emulsify your product, etc…, based on your experiance you need to modify your process.
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