How to Scale Down Any Recipe for One (and When Not To)
"Serves 4" might be the most annoying phrase in cooking for one. You find a recipe that looks great, then realize it wants a whole chicken, two cans of tomatoes and a family-size baking dish. Learning how to scale down a recipe for one is mostly simple math, plus a few traps that are easy to miss the first time.
Here's the math, the awkward bits (half an egg, anyone?), what changes besides the ingredients, and the recipes you shouldn't bother shrinking.
The simple math: divide by the servings
Start with the number the recipe serves and divide every ingredient by it. If a recipe serves 4 and you're cooking for one, divide everything by 4. If it serves 6, divide by 6.
Here's a worked example. Say you have a pasta recipe that serves 4:
| Ingredient | Serves 4 | Serves 1 (divide by 4) |
|---|---|---|
| Pasta | 1 lb (16 oz) | 4 oz |
| Olive oil | 4 tbsp | 1 tbsp |
| Garlic | 4 cloves | 1 clove |
| Canned tomatoes | 1 can (28 oz) | 7 oz (a scant cup) |
| Parmesan | 1 cup grated | ¼ cup |
| Salt | 1 tsp | ¼ tsp |
Some handy conversions for when the numbers get small:
- 1 cup = 16 tablespoons, so ¼ cup = 4 tablespoons.
- 1 tablespoon = 3 teaspoons, so ¼ tablespoon = ¾ teaspoon.
- 1 pound = 16 ounces, so a quarter pound = 4 ounces.
Tip: make it two servings instead of one when the math gets ugly. Divide a 4-serving recipe by 2, eat one portion tonight and have the other for lunch tomorrow. Halving is much easier than quartering, and a planned second meal isn't waste.
Weigh, don't measure, for small amounts
Tiny amounts are where measuring goes wrong. A quarter of 1½ cups of flour is ⅜ cup, which isn't a measuring cup most kitchens have (it's ¼ cup plus 2 tablespoons). A small digital kitchen scale solves this. Most switch between grams and ounces, and you just divide the weight.
If your recipe only lists cups, you can still weigh things once and write the number down. Many recipe sites list both. Grams are the easiest to divide, which is one reason many bakers prefer them.
The awkward bits: half an egg, a pinch of spice
Half an egg
Crack the egg into a small bowl and beat it well with a fork. A large egg is roughly 3 tablespoons once beaten, so half is about 1½ tablespoons. Use that, cover the rest, keep it in the fridge and cook it within a day or two, in scrambled eggs, for example.
Or skip the fuss: in forgiving recipes like meatballs, fritters or a savory pancake, using a whole egg in a scaled-down batch is usually fine. It just makes things a little more moist.
Spices, salt and heat
Divide spices and salt by the same number, but treat the result as a starting point, not a rule. Small amounts are hard to measure, and taste doesn't scale perfectly. Add a little less than the math says, taste, then add more. You can always add salt. You can't take it out.
Chili heat is the one to watch. A whole jalapeño in a four-person chili is pleasant. A whole jalapeño in a one-person version is a different evening.
Cans and packs
Recipes love whole cans and whole packs. When you scale down, you'll often have three-quarters of a can left. Before you start, decide where the rest is going: freeze leftover tomatoes or coconut milk in a small container, or pick a second recipe that uses them this week.
Pan size and cook time change too
This is the step most scaled-down recipes get wrong. The ingredients shrink, but the pan doesn't.
- Use a smaller pan. A quarter of a sauce in a big skillet spreads thin and reduces (or burns) far faster. An 8-inch skillet or a small saucepan keeps things at the right depth.
- Check stovetop cooking early. Smaller amounts of sauce, rice, onions or meat cook faster. Start checking sooner than the recipe says.
- Roasting is different. One chicken thigh takes about as long to roast as one of four chicken thighs, because each piece still needs to cook through. Time depends on the size of each piece, not the size of the batch. Use a thermometer for meat instead of the clock.
- Keep oven temperatures the same. Scaling down changes the amount, not the temperature.
- Liquids evaporate faster in small batches. If a scaled-down soup or braise looks dry, add a splash of water or broth.
What not to scale: bread, cakes, custards
Savory cooking forgives a lot. Baking doesn't. Scaling down a cake or bread by a quarter changes the pan size, how the heat moves through it and how it rises, and the results can be dense, dry or sunken.
Recipes that are tricky to shrink:
- Yeast bread: small doughs are hard to knead and rise well, and the loaf pan won't match.
- Cakes and quick breads: a cake needs the right batter depth for its pan. Cutting it to a quarter means a much smaller pan and a lot of guesswork on bake time.
- Custards, cheesecakes and soufflés: these depend on precise ratios of egg, dairy and heat.
Better options for baked things: make the full recipe and freeze most of it (cookies, muffins and bread slices freeze well), or look for recipes written for one or two, like a mug cake or a small-batch cookie recipe.
The easier route: recipes written for one
Scaling works, but it's a lot of math for a Tuesday. Recipes written for one person from the start skip all of it: the amounts fit one plate, the pan size is right and the cook times are already adjusted.
That's how 3Onions works. It plans dinners for one person, with one grocery list sized for one, so there's no dividing by four. Every recipe has 3 to 5 steps, and cook mode keeps them big on screen with the display awake. If you're tired of doing math before dinner, join the 3Onions early-access list (the iPhone app is almost here, and your first week will be free).
FAQ
How do you halve an egg?
Crack the egg into a bowl and beat it well. A large egg is about 3 tablespoons beaten, so use roughly 1½ tablespoons for half. Keep the rest covered in the fridge and cook it within a day or two.
Does cooking time change when you halve a recipe?
On the stovetop, yes: smaller amounts usually cook faster, so check early. In the oven, it depends on the size of each piece, not how many there are. One chicken thigh roasts in about the same time as four. Keep the oven temperature the same.
Can you scale down baking recipes?
Sometimes, but it's risky. Cookies and muffins scale fairly well by weight. Cakes, bread and custards are much harder because pan size, rise and bake time all change. For those, bake the full recipe and freeze the extra, or find a small-batch recipe.