Restaurant prep par levels calculator

Calculate prep quantities [name,total requirement,additional need] and ingredient lines needing replenishment with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

Use prep quantities [name,total requirement,additional need] and ingredient lines needing replenishment to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Ingredients [name,units per serving,usable stock units]; enter JSON
[["Flour",0.1,2],["Egg",1,15]]
Forecast servings (count)
30
Reserve fraction
0.1
Prep quantities [name,total requirement,additional need] (JSON)
[["Flour",3.3,1.3],["Egg",33,18]]
Ingredient lines needing replenishment (count)
2

Try another scenario

Ingredients [name,units per serving,usable stock units]; enter JSON
[["Flour",0.12,3],["Egg",1,12]]
Forecast servings (count)
40
Reserve fraction
0.2
Prep quantities [name,total requirement,additional need] (JSON)
[["Flour",5.76,2.76],["Egg",48,36]]
Ingredient lines needing replenishment (count)
2
Calculation method

Calculation method

Prep quantities [name,total requirement,additional need] (JSON)

Requirement=units per serving×forecast×(1+reserve); additional=max(0,requirement−usable stock).

Ingredient lines needing replenishment (count)

Count requirements above usable stock.

Symbols and units
a
Ingredients [name,units per serving,usable stock units]; enter JSON
b
Forecast servings (count)
c
Reserve fraction

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Assumptions & limits

Assumptions & limits

  • One recipe ingredient per row and scalar reserve policy; no recipe substitution. Supported limits: All numeric inputs and computed intermediates must remain finite. Supported numeric input magnitude is zero or 1e-12 through 1e12 in absolute value; reject values outside this bounded range. All lists/JSON record tables are limited to 100 records unless a stricter bound is stated; reject malformed record arity and wrong member types. All numeric values must be finite. Lists contain at most 100 records; required lists must be nonempty. Rates, probabilities and fractions are entered as fractions, not percentages; fractions must be between 0 and 1. Use a single consistent user-selected currency for all amounts; no exchange-rate conversion.
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