The first thing to figure out is how much fragrance to use in your product. This depends on three factors:
1) The maximum amount of scent the product base will accept.
2) The maximum IFRA skin safe level.
3) The amount of fragrance that smells good in your product.
You will look at these three maximum guidelines and use the LOWEST percentage.
Confused? Watch this short video for more information:
Determining Fragrance Oil Amounts.Next, multiple the percentage times the total weight of your product.
For example if you will use 3% for 16 ounces of products. Multiply .03 times 16. This equals 0.48 so you would add 0.48 ounces to your product.
For more information, watch this short video:
Calculating Fragrance Oil Amounts.