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Mashed-Potato Servings & Recipe Mass Planner

Scale mashed-potato portions by mass or estimated cup volume, using an explicit 210 g-per-cup assumption and an 80/20 potato-to-liquid mass split.

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Enter the known values in the units shown. Results update as you type.
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Four portions of 210 g require 840 g total. Under the retained 80/20 recipe model, that is 672 g potatoes and 168 g added liquid.

Total mass = portion mass × serving equivalents; model volume = mass / 210 g per cup; potatoes = 80% and liquid = 20% of total mass

Enter these known values and leave the other values blank.

The retained estimate is 210 g of prepared mash per cup. Packing, potato type and recipe can change actual density.
Cup and tablespoon outputs use US recipe measures, with 16 tablespoons per cup. The density estimate remains approximate even though their unit ratio is exact.
The recipe allocates 80% of the modeled mass to potatoes and 20% to added liquid by mass. It does not account for peel loss, cooking-water changes, evaporation or separate butter and seasoning additions.
Serving equivalents may be fractional for scaling. All portions and quantities must be positive. Liquid output is a mass; it is not automatically the same numerical volume for every ingredient.

No. It is the potato share of the recipe model. Add your own allowance for peels, trimming, preparation losses and leftovers.

Bookify makes the recipe-volume convention explicit with exactly 16 US tablespoons per US cup, retaining the approximate 210 g-per-cup food density.