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# How would I calculate amount by weight, of a powder in a liquid

I need to add .2% of a color powder to an amount of liquid.
How would I calculate the amount, in grams, of the color powder that would be required to go into 8oz of a liquid.
Thank you.

• convert ounces to grams then multiply by 0.002
Design of anti-aging creams, gels, and serums; shampoos; and therapeutic cosmetics. In-house label and box design capability.
• You need to know the specific gravity/density of the liquid to convert volume in ounces to grams and use above math.
• edited July 2017
Great.
The liquid is milk
I found a website that lists the weight of 8oz of milk as 245g.
In searching, I learned that the specific density of milk changes with temp.
So I assume I could actually just weigh the 8oz of milk and multiply that by .002...

Thank you both.
Jason
• Yes, measure out 8oz of milk and weigh it.
Chemist/Microbiologist formulating in the Organic & Naturals arena under ECOCert/Natural Products Assn/Whole Foods/National Organic Program guidelines focused skincare & haircare products.

Provides Formulation Development and Lab-Scale Contract Manufacturing Services.  See website for details www.desertinbloomcosmeticslab.com