Brewing calculation
Recipe Scaling & Split Calculator
Scale a known coffee-and-water recipe to a new water mass, then see the equivalent share for each serving.
Base recipe
What it calculates
The scale factor is target water divided by base water. That same factor is applied to the dry coffee mass, preserving the recipe’s input ratio.
Limit
Scaling does not promise the same flow rate, temperature loss or cup result at a larger batch. Confirm your brewer capacity and tune the next brew from observation.
How to use it
- Enter the coffee dose and water amount from the recipe you want to keep as a reference.
- Choose either a scaling factor or a target number of servings.
- Use the calculated amounts as a starting recipe, then verify that your brewer can hold the batch.
- Record the result and adjust after tasting rather than assuming a larger batch will behave identically.
When this helps
Use it to make a transparent first draft for two cups, a carafe or a smaller practice brew. The tool preserves the stated masses proportionally; it does not alter grind, pouring pattern, contact time or brewer capacity for you.
Frequently asked questions
It multiplies both the coffee dose and water amount by the same number, preserving the original input ratio.
Not necessarily. A different bed depth, flow rate, temperature loss and brewer geometry can change a brew. Treat the calculation as a measured starting point.
Yes. A fractional target simply creates a proportional recipe. Use a scale that can measure the resulting amounts appropriately.
No. Check the brewer maker’s stated capacity and leave room for the coffee bed and your pouring workflow.
Related tools
- Coffee to Water Ratio Calculator — set or inspect the underlying ratio.
- Brewing Equipment Size Guide — check stated capacity before scaling.
- Brew Log — compare scaled-batch observations.