Scaling a recipe sounds simple until you try to halve three eggs or double a cake for a crowd. Small mistakes in amounts can change the taste, the texture, and even whether a dish cooks properly. This free scaler removes the mental maths: you enter the original servings, the servings you want, and your ingredients one per line, and the tool adjusts every amount for you. It works for everyday cooking, from soups and stews to salads and baked dishes. It is a pure cooking-maths tool, with no account and no sign-up needed.
The scaler works with a single idea, the scale factor. Divide the servings you want by the original servings, and multiply every ingredient amount by that number. A recipe for four people scaled to eight has a factor of two, so two hundred grams of flour becomes four hundred grams. A recipe for four scaled to two has a factor of one half, so the same flour becomes one hundred grams. The tool shows the factor first, so you can check it makes sense before you trust the scaled amounts.
Writing your ingredients well makes scaling much more accurate. Put one ingredient per line, and start each line with a number, such as 200 g flour or 2 eggs. Lines without a number, like salt to taste, pass through unchanged, which is correct because taste seasonings should be adjusted by tasting, not by maths. Keep units consistent within a line, and avoid mixing two amounts in one line. If your recipe lists an ingredient as one onion, the scaler treats the one as the amount and scales it like any other number.
Fractions and awkward amounts need a little judgement after scaling. Half of three eggs is one and a half eggs, which you can handle by beating one egg and adding about half of a second. Spices scale well in maths but not always in taste, so scale them, then taste and adjust. Very small amounts, like a pinch of saffron, rarely need exact scaling at all. Baking is less forgiving than cooking: when you scale a cake, keep the pan size and the baking time in mind, since a much larger cake needs longer in the oven.
Serving counts are only estimates, so think about who is actually eating. Children often eat smaller portions than adults, while hungry teenagers may eat more than one standard serving. A side dish for eight people needs fewer servings than a main dish for the same group. If you are unsure, scale slightly up rather than down, because extra food can become lunch tomorrow, while too little food cannot be fixed after cooking. The scaler helps with amounts, but your judgement about portions still matters most.
Using the tool takes less than a minute. Enter the original servings from the recipe, then the servings you want to cook for. Paste or type your ingredients into the box, one per line, each starting with a number. Press the button, and the tool lists every scaled amount in the same order. Copy the list into your notes or onto paper, and cook as normal. If an amount looks strange, check the original line for a typo, since a missing number or a doubled line is the usual cause.
Large scaling needs extra care with equipment and timing. Doubling a soup is easy, but doubling a stir-fry in a small pan will steam the food instead of frying it, so cook in two batches. A doubled stew needs a bigger pot and a little more time to reach a simmer. Seasoning should be added in stages when you scale up, because doubling salt at once can easily overshoot. Taste as you go, and remember that scaled amounts are a guide, while your eyes, nose, and taste buds make the final call.
This scaler is general cooking education, not professional culinary advice, and it cannot judge whether a recipe scales well. Some recipes, like souffles and delicate sauces, do not scale cleanly, and it is often better to make two separate batches. Yeast doughs scale well in amounts but still need normal rising times. Keep the original recipe beside you, note any changes you make, and build a personal collection of scaled recipes that worked. With practice, scaling becomes a quick habit rather than a source of kitchen stress.
Spanish version: Escalador de Recetas por Raciones – Ajusta Ingredientes a tus Comensales