Recipe scaler
Scale a recipe to a different batch size and keep every concentration the same.
The batch the numbers below belong to.
Scaling works downwards too.
Components
For 25 mL · ×2.5
Supplement
2.3% of the batch
Medium, to make up
Bringing the batch to volume
Your stock must be 10.87 mg/mL for that to come out right. Unchanged by the scaling.
amount_new = amount_old × (batch_new ÷ batch_old)- Amount concentration, the ratio scaling preserves — IUPAC Compendium of Chemical Terminology (the Gold Book), 2019
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Every concentration is preserved because both the component and the batch scale by the same factor. This assumes the components add to the volume — if your recipe means “make up to” rather than “add to”, the medium figure above is the one to use.
About this tool
You have a recipe that makes one volume and you need a different one. Enter what the recipe is written for, enter the batch you actually want, and every component scales by the same factor — so 230 µL of a supplement in 10 mL of medium becomes 575 µL in 25 mL, at the same final concentration. Handles as many components as the recipe has, works down as well as up, and tells you how much medium to make up with.
Related tools
- Dilution calculator — Work out how much stock and diluent to combine for a target concentration.
- Molarity calculator — Convert between mass, molar concentration and volume for a solution.
- Serial dilution calculator — Plan a dilution series and get the transfer volume for every step.
Science last reviewed .