Batch cooking helper

Recipe Leftover Portion Calculator

Work out exactly how many portions a batch recipe yields, and how many leftover portions remain after some has already been served.

—Total portions
—Already served
—Remaining leftovers
Tip: cool leftovers before sealing them up, store them in an airtight container, and label the container with the date so you know how long it's been in the fridge or freezer.

Calculated on your device. Nothing is saved or uploaded.

Why calculate leftover portions

Plan meals ahead

Know exactly how many lunches or dinners a batch recipe will stretch to before you start cooking.

Reduce food waste

Portioning leftovers accurately means less guessing about how much to save, freeze or give away.

Works either way

Whether your recipe states servings or you just know the total weight or volume, both paths give a clear number.

How to use the calculator

  1. Pick a modeServings and scale factor, or total batch amount and portion size.
  2. Enter your numbersFill in the recipe's stated servings and how much you scaled it, or the batch total and portion size.
  3. Add what's been servedOptionally enter how many portions are already gone.
  4. Read the resultSee total portions and exactly how many leftover portions remain.

About the calculation

Recipes are written in two common ways: some simply state a serving count like "serves 6," while others just tell you the total weight or volume the batch produces, such as a 3 kilogram pot of stew. This calculator supports both. In servings mode, it multiplies the recipe's stated servings by whatever scale factor you applied — 2 for doubling, 0.5 for halving, or any custom multiplier — to get total portions. In batch mode, it divides the total batch amount by your desired portion size and rounds down, since a partial portion below your chosen size doesn't count as a full one. Either way, if you tell it how many portions have already been eaten or served, it subtracts that from the total to show how many leftover portions remain, never going below zero. The portion size field is guarded against zero or blank entries, since dividing by zero has no meaningful answer, and the calculator will ask you for a valid number instead of showing an error.

2 calculation modes

Servings and scale factor, or total batch amount and portion size — pick whichever matches your recipe.

Zero-safe math

Guards against a zero or missing portion size so you never see NaN or a broken result.

Remaining, not just total

Subtracts already-served portions so you know exactly what's left for later.

Recipe leftover portion calculator FAQ

Which mode should I use?

Use servings and scale factor when your recipe already states a serving count, like "serves 6," and you scaled it up or down. Use total batch amount and portion size when you know the total weight or volume produced, like a 3000 g batch of chili, and want it split into fixed portions.

What does the scale factor mean?

It's the multiplier you applied to the original recipe. Doubling a recipe is a scale factor of 2, halving it is 0.5, and leaving it unchanged is 1.

What happens if I enter a portion size of zero?

The calculator will ask you to enter a portion size greater than zero instead of showing an error or an incorrect number, since dividing by zero has no valid answer.

How is "remaining portions" calculated?

It's the total portions your batch makes minus however many portions you say have already been served or eaten, floored at zero so it never shows a negative number.

Does this tool tell me exactly how long leftovers last?

No. It only estimates portion counts. For how long specific foods stay good, follow your local food safety guidance, since that depends on the dish, temperature and storage method.

Try other kitchen tools

More free cooking tools from My Panda Toolbox.

COSTRecipe Cost CalculatorWork out cost per serving and menu price. SCLERecipe ScalerScale ingredient amounts up or down. PNTYPantry Expiration TrackerTrack pantry items and get expiry reminders. MEALWeekly Meal PlannerPlan meals for the week ahead.