Scale ingredients for a crowd

Start with a recipe and a known yield

Use a recipe with a clear serving count and ingredient amounts. Keep the original method beside your working list. If the author gives a pan size, number of pieces or measured finished yield, record it too. A vague "feeds a crowd" label does not give enough information for a precise multiplier.

Choose the target yield after you review the whole potluck menu. A dish among several options may need a different target from the main course. Confirm that decision with the host before buying ingredients. PotluckTime’s scaler changes ingredient quantities; it does not validate a recipe or decide whether the target servings fit the event.

Calculate the multiplier

Divide the target servings by the original servings. A recipe that serves four, scaled to ten, has a multiplier of 2.5. A line containing 200 g becomes 500 g because 200 × 2.5 = 500. This is an arithmetic example, not a published or tested recipe. Use the same calculation for the other measured ingredient amounts.

Keep the original units while calculating. Do not assume that a cup of one ingredient has the same weight as a cup of another, or that two countries use identical measuring cups. If you need a conversion, use an ingredient-specific source and the recipe’s measurement system. Changing quantity and changing units at once makes a shopping list harder to check.

Review each line before you shop

Check the output against the original ingredient list. Text such as "to taste", a quantity range or an unclear amount needs a manual decision. The tool keeps unrecognised lines for you to review instead of assigning a guessed number. Do not treat unchanged text as confirmation that the amount fits the larger batch.

For countable ingredients, distinguish the calculated amount from the amount to purchase. If arithmetic produces part of an item, look for instructions in the original recipe before deciding how to measure it. Buying a whole package does not mean adding the whole package. Keep optional toppings and separate sauces on their own lines so they are not forgotten.

• Compare every scaled line with the original.
• Resolve ranges, informal amounts and partial items by hand.
• Keep original units unless you have checked a suitable conversion.
• Separate the quantity to use from the package size to buy.

Treat the cooking method as a separate decision

An ingredient multiplier is not a cooking-time multiplier. It also does not establish a new oven temperature, pan depth or safe storage schedule. If you have not verified a larger method, consider repeat batches in the original equipment. If the original batch serves six and you need ten, two original batches may work better than an improvised oversized pan.

Follow the recipe’s method and the appropriate official food-safety guidance for the food you prepare. USDA guidance explains the use of a food thermometer for safe cooking and reheating; a scaled shopping list cannot replace that check. Record your changes, and avoid calling the adapted recipe tested until you have verified its results.