Serving Size Converter
Your recipe fills one cup; you want to fill another. Pick both from the cupboard and get the same coffee, resized.
Cups and mugs
Your recipe for the standard cup
For the travel mug
That's 1.96× your recipe, still at 1:16.7.
How it works
This converter helps you keep the same coffee strength when you move between cup sizes, mugs, travel tumblers, or recipe formats.
- Preserve brew ratio when changing serving volume.
- Label cup sizes in millilitres or fluid ounces, whichever your mugs are sold in.
- Use preset mug sizes for common home and travel cups.
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Enter the original recipe that already works
Use the coffee, water, and serving size from a brew you actually like.
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Select the new target cup size
Use a preset or type the exact volume for your mug or brewer.
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Brew the converted recipe and confirm taste
The result should preserve strength, but you may still need a minor grind adjustment if the brewer geometry changes.
Questions
Can I just add more water to stretch a recipe?
You can, but doing so without increasing coffee will make the cup weaker. A proper conversion keeps the ratio consistent.
Why does the same recipe taste different in a larger mug?
Larger servings can cool differently and sometimes change your perception of sweetness, acidity, and body, even when the ratio stays the same.
Can I see cup sizes in fluid ounces?
Yes. Switch the units to fl oz and the cups are labelled in fluid ounces. You still type cup sizes in millilitres, and the coffee and water amounts stay in grams.
Should I also change brew time when serving size changes?
Sometimes. If the conversion changes brewer geometry or batch size meaningfully, time and grind may also need small adjustments even when the ratio stays fixed.