You boil a whole packet of spaghetti for two people and end up with a bowl big enough for six. Or you boil too little, and the sauce has nothing to cling to. Pasta changes size so much in the pot that it is hard to judge by eye.
This dry to cooked pasta converter tells you what to expect. Enter the dry weight and see the cooked weight and volume, or start with the cooked amount a recipe needs and see how much dry pasta to measure out.
How to use the Dry to Cooked Pasta Converter#
- Pick the direction. Choose dry to cooked or cooked to dry.
- Enter the amount. Type the weight of dry pasta, or the cooked amount you need.
- Choose the unit. Grams and ounces work for both. Cups are available for cooked pasta.
- Choose how done. Al dente absorbs less water than soft pasta.
- Read the result. You get weight, an estimate in cups, the water absorbed and the number of servings.
Why pasta gets heavier#
Dry pasta is mostly starch and protein, with about 10 percent water. Boiling lets the starch absorb water and swell, and cooked pasta is around 60 percent water or more. The dry matter does not change. The extra weight is all water, which is why the cooked weight is roughly twice the dry weight and sometimes a little more.
The USDA nutrient database shows the effect in the calories. Dry spaghetti has roughly 370 calories per 100 grams and cooked spaghetti has about 158. That is a ratio of about 2.35, which is the figure the calculator uses for tender pasta.
The formula#
Cooked weight equals dry weight times a yield factor. For al dente pasta the factor is about 2.1, for tender pasta about 2.35 and for soft pasta about 2.6. To go the other way, divide the cooked weight by the same factor. For volume the calculator uses 140 grams per cup of cooked pasta, the weight the USDA lists for a cup of cooked spaghetti and other cut pasta shapes.
For example, 200 grams of dry pasta cooked until tender gives 470 grams, which is around 3.4 cups. Of that weight, 270 grams is absorbed water.
How much pasta per person?#
Dietary advice in the United States treats about 2 ounces of dry pasta, 56 grams, as a standard portion, which makes about 1 cup of cooked pasta. A main course serving for a hungry adult is often twice that. For long pasta, the usual trick is to hold the dry bundle in a loop made with your thumb and finger. A bundle about as wide as a US quarter is roughly 2 ounces.
| Dry pasta | Cooked weight (tender) | Cooked cups |
|---|---|---|
| 56 g (2 oz) | 132 g | 0.9 cups |
| 100 g (3.5 oz) | 235 g | 1.7 cups |
| 200 g (7 oz) | 470 g | 3.4 cups |
| 250 g (9 oz) | 588 g | 4.2 cups |
| 454 g (1 lb) | 1,067 g | 7.6 cups |
What changes the result#
Cooking time matters most. Pasta cooked a minute or two past the packet time takes up more water and weighs more. Shape matters a little too, since thin shapes cook faster and thick ones, like rigatoni, can stay firmer at the centre. Whole wheat and gluten free pasta behave differently again, and some gluten free brands absorb more water. The calculator gives a good estimate for standard wheat pasta, and the yield factor is the setting to change if your results come out different.
Cup figures for cooked pasta are rough, because the shape and how tightly it is packed change the weight in the cup. Use grams when you can.
Planning leftovers#
Cooked pasta keeps for three to five days in the fridge, and it will keep absorbing sauce. If you plan to reheat it, undercook it slightly, in the al dente setting, so it does not turn soft. Cook only what you need by reading the cooked amount from this converter, and save a mug of the cooking water, since the starch in it helps sauces cling.
Cooking pasta well#
Use a large pot with plenty of boiling water so the pasta moves freely and does not stick together. Add salt once the water boils, since pasta absorbs it as it cooks, and stir during the first minute. Start tasting a minute or two before the packet time. Pasta that you will finish in a hot sauce should come out slightly firm, because it carries on cooking in the pan. Reserve a cup of the cooking water before you drain. Do not rinse pasta that will be served hot, because the surface starch helps the sauce cling.
Frequently asked questions#
By weight, about 2 to 2.5 times. By volume, short pasta roughly doubles.
About 60 grams, or just over 2 ounces, makes a cup of cooked pasta.
Plan on 56 to 100 grams, or 2 to 3.5 ounces, depending on whether it is a side dish or a main course.
On a packet it means dry. Nutrition labels list dry weight unless they say cooked. Cooked pasta has fewer calories per gram.
No. A cup of dry pasta makes about two cups cooked, depending on the shape.
It was probably cooked longer or rinsed in a way that held extra water. Choose the soft setting.
Sources and further reading#
- USDA FoodData Central. Food composition and household measure weights.
- MyPlate: Grains. US guidance on pasta portions.
- Omni Calculator: Dry to Cooked Pasta Converter. Cross-check of the cooked to dry ratios.