Short answer: Use level cups and spoons for foods you can scoop or pour (1 cup of cooked rice is about 158 g and 205 kcal), your palm or everyday objects for shaped foods like meat or fruit, and measure calorie-dense foods such as oil, nuts and nut butter at least once. Then calibrate your eye: measure your usual bowl, glass and spoon once and reuse those numbers.
You don’t need a kitchen scale to log food reasonably well. You need a few reference amounts you trust, and the habit of using the same bowls, glasses and spoons. This guide gives you those references – cups, spoons, slices, hand sizes and everyday objects – with grams and calories for common foods, plus a short routine to train your eye.
One definition first. A serving is a standard amount, such as the serving size on a label; a portion is what you actually eat. They are often different, so always log your portion. For the bigger picture, see how to count calories accurately.
Household measures: cups, spoons, bowls and slices
For US nutrition labels, a teaspoon means 5 ml, a tablespoon 15 ml and a cup 240 ml. Those are volumes, so the weight depends on the food and on how you fill the measure:
- Level, not heaped. A level spoon or cup is repeatable; a heaped one isn’t. Some guides use heaped spoons on purpose: the NHS counts 3 heaped tablespoons of cooked carrots, peas or sweetcorn as one 80 g vegetable portion.
- Loose vs packed. USDA lists a cup of cooked spaghetti at 124 g loosely filled and 151 g packed – about 195 vs 240 kcal from the same cup.
- Shape matters. A cup of cooked penne weighs about 107 g, less than a cup of spaghetti.
- Slices vary. USDA lists slices of white bread from 15 g (very thin) to 30 g (large).
- Bowls and glasses aren’t standard. Fill yours once with water from a measuring jug and note how much each holds.
| Food and measure | Weight | Energy |
|---|---|---|
| Cooked white rice, 1 cup | 158 g | 205 kcal |
| Cooked spaghetti, 1 cup, loose | 124 g | 195 kcal |
| Cooked lentils, 1 cup | 198 g | 230 kcal |
| Cooked chickpeas, 1 cup | 164 g | 270 kcal |
| Cooked couscous, 1 cup | 157 g | 175 kcal |
| Rolled oats, dry, ½ cup | 40 g | 155 kcal |
| Pita bread, 17 cm (6½ in) | 60 g | 165 kcal |
| Corn tortilla, 15 cm (6 in) | 26 g | 60 kcal |
| Egg, large | 50 g | 70 kcal |
| Banana, medium | 118 g | 105 kcal |
| Medjool date, 1 | 24 g | 65 kcal |
| Cheddar, 1 slice | 28 g (1 oz) | 115 kcal |
| Plain whole-milk yogurt, 1 cup | 245 g | 150 kcal |
| Olive oil, 1 tbsp | 13.5 g | 120 kcal |
| Peanut butter, 1 tbsp | 16 g | 95 kcal |
Measuring sets from different countries are not always identical, so check the volume printed on yours. Packaged foods are easier: the label gives you the weight, and our guide on how to read a nutrition label explains serving sizes.
The hand and everyday-object guide
With no measuring cups around, your hand and familiar objects work as rough references. These comparisons come from MedlinePlus, the US National Library of Medicine’s consumer health service:
| Food | Amount | Roughly the size of |
|---|---|---|
| Meat or poultry | 1 serving | The palm of your hand or a deck of cards |
| Cooked rice or pasta | 80 g (½ cup) | A rounded handful or a tennis ball |
| Chopped raw fruit or vegetables | 90 g (1 cup) | A woman’s fist or a baseball |
| Apple or orange | 1 medium | A tennis ball |
| Nuts or dried fruit | 35 g (¼ cup) | A golf ball or a small handful |
| Peanut butter | 32 g (2 tbsp) | A ping-pong ball |
| Cheese | 1 serving | A pair of dice |
| Baked potato | 1 medium | A computer mouse |
The limits of the hand method
Treat it as a rough guide. Hands differ in size, and research shows the limits. In a 2016 study, 67 adults estimated 42 pre-weighed foods and drinks. Using a fist to size shapeless foods such as rice and breakfast cereal was usually off by more than half, and misjudged foods tended to be overestimated. Shaped foods did better when people measured length, width and height in finger widths: 80% of those estimates were within 25% of the true weight. Cups, by contrast, did poorly for solid shaped foods.
The takeaway: use cups and spoons for foods you scoop or pour, your palm or dimensions for shaped foods like a fillet or a slice of cake, and don’t trust a fist for a pile of rice or cereal.
Calorie-dense foods worth measuring once
A portion error matters in proportion to how much energy the food packs per gram. Misjudging cooked broccoli by 50 g shifts your total by under 20 kcal; misjudging almonds by 50 g shifts it by about 290 kcal. Put your measuring effort into the dense foods:
- Oils and fats. A teaspoon of oil is about 40 kcal, a tablespoon about 120 kcal. Pour into a spoon, not straight from the bottle into the pan.
- Nuts, seeds and nut butters. A level tablespoon of peanut butter is about 95 kcal, so level the spoon rather than scooping a mound from the jar.
- Cheese. A 28 g (1 oz) slice of cheddar is about 115 kcal, and grated cheese is easy to over-pour.
- Grains and cereals. Rice, pasta, couscous, oats and granola – the shapeless foods that are hardest to eyeball.
- Dried fruit and drinks. Dates, raisins, juice and alcohol. Measure your usual glass once.
Once really can mean once: measure your usual serving, note it, and reuse it. Recheck every so often, because habits drift.
Calibrate your eye in a week
- Day 1: measure your containers. Fill your everyday bowl, mug and glass with water from a measuring jug and note what each holds when filled the way you usually fill it.
- Days 2–3: serve, then check. Serve your usual rice or pasta by eye, then tip it into a measuring cup.
- Day 4: the oil test. Pour what you think is a tablespoon of oil into a cup, then check it with a real tablespoon.
- Days 5–7: guess first. Write down a guess before each measurement. You’ll soon see whether you tend to guess high or low.
- Keep reference photos. Photograph a measured portion on your usual plate as a visual benchmark.
Example: say you think you serve 1 cup of cooked rice. In the measuring cup it turns out to be 1½ cups – about 235 g and 310 kcal instead of 205 kcal. Next time, serve less or log 1½ cups. Either is fine; what matters is that the log matches the plate.
Estimating portions when eating out
- Break the plate into parts: protein (palm), starch (cups), vegetables, and sauce or dressing (spoons).
- Compare with your reference photos and measured home portions.
- Ask for dressings and sauces on the side, so you can see how much you use.
- For shared dishes, estimate the whole dish, then log your share.
- MedlinePlus suggests splitting a main dish or setting half aside before you start.
How Portiva helps
Portiva lets you log portions the way you serve them – bowls, cups, spoons and slices as well as grams – with dishes from kitchens around the world. When you log by photo or live camera scan, every item shows its estimated portion and you can change it before saving. If something would change the calories a lot, such as the portion size, the oil in the pan or a sauce, Portiva asks one short question instead of guessing. Read more about what a photo can and can’t tell about portions.
Frequently asked questions
How can I measure food without a scale?
Use level measuring cups and spoons for foods you can scoop or pour, such as rice, oats, yogurt and oil. Use your palm or a deck of cards as a guide for a serving of meat, and count foods that come in units, like eggs, slices or pieces of fruit. Measure your usual bowls and glasses once with water so you know how much they hold.
How many grams is a cup of cooked rice?
According to USDA FoodData Central, 1 cup (240 ml) of cooked long-grain white rice weighs about 158 g and has about 205 kcal. Half a cup, about 80 g, is roughly the size of a tennis ball or a rounded handful. Pressing rice into the cup adds weight, so fill it loosely and level it off for a consistent measure.
What does a portion of meat look like?
MedlinePlus compares one serving of meat or poultry to the palm of your hand or a deck of cards. That is a reference amount for logging, not a target for everyone: how much protein you need depends on your body size, age, activity and goals. Our guide on how much protein you need per day explains how to work it out.
How many grams is a tablespoon?
A tablespoon is a volume – 15 ml on US nutrition labels – so its weight depends on the food. Using USDA values, a level tablespoon of olive oil weighs about 13.5 g (120 kcal), peanut butter about 16 g (95 kcal) and honey about 21 g (65 kcal). Level the spoon when you measure, because heaped spoons vary a lot.
Is the hand portion method accurate?
It is a rough guide. In a 2016 study of 67 adults, using a fist to size shapeless foods such as rice and cereal was usually off by more than half, while measuring shaped foods in finger widths was much closer. Hands are useful when nothing else is available, but for calorie-dense or shapeless foods, a measuring cup or spoon is the better choice.
Sources
- Portion size, MedlinePlus, U.S. National Library of Medicine (reviewed 2024).
- 5 A Day portion sizes, NHS (2022).
- FoodData Central (SR Legacy data), U.S. Department of Agriculture, Agricultural Research Service (2018).
- 21 CFR 101.9 – Nutrition labeling of food, U.S. Government Publishing Office (2025).
- Accuracy of hands v. household measures as portion size estimation aids, Gibson AA et al., Journal of Nutritional Science (2016).