Custard Ratio Calculator Formula

Understand the math behind the custard ratio calculator. Each variable explained with a worked example.

Use the Custard Ratio Calculator

Formulas Used

Total Dairy

total_dairy = servings * serving_ml

Whole Eggs Needed

whole_eggs = ceil(servings * serving_ml / (120 * custard_style))

Dairy (cups)

dairy_cups = servings * serving_ml / 240

Sugar (approx)

sugar = servings * serving_ml * 0.08

Variables

VariableDescriptionDefault
servingsNumber of Servings6
serving_mlVolume per Serving(mL)150
custard_styleCustard Style1
total_mlDerived value= servings * serving_mlcalculated

How It Works

How to Calculate Custard Ratios

Formula

Eggs = ceil(Total Dairy / (120 mL x Style Factor))

Style Factors

  • Standard baked custard: 1 whole egg per 120 mL of dairy (milk, cream, or a blend)
  • Rich creme brulee: 1 egg per 90 mL (denser, uses more yolks)
  • Light quiche: 1 egg per 180 mL (more liquid, softer set)

    • Using a higher proportion of yolks to whites produces a richer, silkier custard. Many creme brulee recipes use yolks only.

    Sugar

    For sweet custards, about 8% of the total dairy weight in sugar is a balanced starting point.

    Worked Example

    6 servings of 150 mL standard baked custard.

    servings = 6serving_ml = 150custard_style = 1
    1. 01Total dairy = 6 x 150 = 900 mL
    2. 02Eggs = ceil(900 / 120) = ceil(7.5) = 8 eggs
    3. 03Dairy in cups = 900 / 240 = 3.75 cups
    4. 04Sugar = 900 x 0.08 = 72 g (about 1/3 cup)

    Ready to run the numbers?

    Open Custard Ratio Calculator