Reagent Scaling Calculator
Scale laboratory recipe component amounts from an original final volume to a new target volume while preserving component ratios.
Scale a laboratory reagent recipe
Scale up or down a multi-component recipe by final batch volume while preserving component ratios.
| Reagent | Original amount | Scaled amount |
|---|
How the Reagent Scaling Calculator works
Recipe scaling uses a single factor: target final volume ÷ original final volume. Every component amount is multiplied by that factor, preserving the recipe proportions. This is useful for buffers, media and reagent mixtures whose validated formulation is already known.
How to use this reagent scaling calculator
Enter the original and target final volumes, then list reagent names and original amounts in matching line order. Keep each reagent’s unit exactly as used in the source recipe—for example grams stay grams and millilitres stay millilitres. The calculator scales numbers but does not convert between unlike units.
How to interpret the result
The unlisted make-up volume is target minus the scaled sum only when all listed amounts are compatible volume units. It can be useful for recipes that list several liquid additions and then say “bring to final volume,” but it should be ignored when rows mix masses, volumes and concentrations.
Assumptions and limitations
Some laboratory formulations do not scale perfectly because pH adjustment, solubility, heat transfer or reaction chemistry changes with batch size. Stock solutions may also be prepared by concentration rather than direct proportional mass. Follow the validated SOP and use this tool only for the proportional part of the recipe.
Practical example and workflow
A 100 mL validated recipe scaled to 250 mL has a factor of 2.5. An 80 mL component becomes 200 mL, a 5-unit component becomes 12.5 units and so on. The transparent row table is easier to audit than manually multiplying each line in a notebook.