Cooking For One Calculator
| Ingredient type | 4 to 1 rule | Why |
|---|---|---|
| Liquids, pasta, rice | divide exactly | they divide honestly |
| Eggs | beat, measure by volume | half an egg is 2 tablespoons |
| Dry spices, aromatics | round UP | taste and add; floor is real |
| Liquids for braising | round DOWN | smaller pans evaporate less |
| Leavening (baking) | scale gently, ~85% | chemistry is not linear |
Scaling a recipe down is division with judgment: divide everything by the factor, then apply the rounding rules - the egg becomes a beaten half-egg saved for tomorrow's scramble, dry spices round up because you can taste and add, and liquids round down because they do not come back.
Bottom line: a four-serving recipe for one is a quarter of everything except the pan heat (unchanged), the seasoning (three-quarters to start), and the cooking time (two-thirds, checked early) - the three adjustments that make halved and quartered food taste like cooking instead of leftovers.
The honest part: some things refuse to divide - a whole cabbage, half a can of coconut milk, one chicken thigh package of four - and the solo cook's real skill is the follow-up meal. The refrigerator shelf of half-ingredients is not a failure of scaling; it is next Tuesday's dinner already started.
How to use
- Enter the recipe's original servings and the number you are cooking for - 4 to 1, 6 to 2, anything the division needs.
- Apply the rounding rules where the calculator flags them: eggs beaten and halved, spices rounded up, liquids rounded down, leavening scaled gently.
- Cut the cooking time to two-thirds and check early - smaller volumes in the same pan cook faster than linear scaling suggests.
Frequently asked questions
How do I halve an egg in a recipe?
Beat the egg until uniform, then measure half by volume - about two tablespoons - and refrigerate the rest for tomorrow's scramble or fried rice. The alternative that skips the measuring cup: use one small egg instead of one large, or for baking where the egg matters, weigh it, because grams halve more honestly than shells do.
Do I halve cooking time when I halve a recipe?
No - cut it to about two-thirds and start checking early: a single chicken breast reaches temperature in the same oven that took an hour for four, in maybe 35 minutes, because the oven's heat does not know the recipe changed. Pan size matters too - the halved recipe in the original pan spreads thinner and cooks even faster.
Should I halve the spices when scaling down?
Round the aromatics and ground spices up: a recipe calling for a teaspoon of cumin across four servings wants a full teaspoon for two people, because spice perception does not divide linearly and the smallest measurable amount is a real floor. Salt divides honestly; chili flakes absolutely do not.
Is it cheaper to cook for one or meal prep?
Meal prep wins the ingredient arithmetic - bulk proteins and shared components price a third less per plate - but the solo cook who hates eating Thursday's chili on Monday throws half of it away, and disposal is a cost too. The honest hybrid: cook for two, eat one, and freeze the second portion before the first bite makes it boring.