Reduce or Enlarge a Master Formula
Reduce or enlarge a master formula to a wanted yield, or to a wanted quantity of one ingredient.
Open the tool → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Master formula, one ingredient per line
- Hydrocortisone, 1, g Glycerin, 5, g White petrolatum, qs, g
- Yield of the master formula
- 100
- Unit of the yield
- g
- Yield wanted
- 30
Result: Factor 0.3: 3 ingredients scaled to 30 g.
The tool opens with these values already filled in. Replace them with your own.
What you enter
- Master formula, one ingredient per line: name, quantity, unit (the quantity may be "qs"; the unit may be "parts")
- Yield of the master formula (not needed for a formula in parts)
- Unit of the yield
- Yield wanted (give this, or one ingredient and its wanted quantity)
- Or: the ingredient to scale by, as written in the formula
- Quantity of that ingredient wanted, in its own unit
How this is calculated
Citation
Arithmetic identity (proportion): every quantity × wanted yield ÷ master yield. A formula in parts becomes fractions of the total; a qs line is the yield less everything else when the units agree.
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.