You can judge portions well enough without weighing anything, because you carry the measuring tools with you. Your palm, your fist, your thumb and a standard plate will get you close on most meals, and close is enough for most people most of the time.
Why it is worth learning
People underestimate how much they eat. Not by a little, and not because they are lying to themselves on purpose. It happens because a serving of rice looks like whatever the bowl makes it look like, and because the second handful of nuts never really registers.
That gap is enough to stall a diet on its own. If your intake is 300 calories a day above what you think it is, you can do everything else right and still go nowhere. Learning what a portion looks like fixes the problem at the source, and it keeps working on days when you cannot be bothered to log anything.
Your hands are the fastest tool
Hands scale roughly with body size, which is a useful accident. A bigger person has bigger hands and generally needs more food.
A palm of protein, meaning meat or fish about the thickness of your palm, comes to roughly 3 to 4 ounces. A cupped hand of rice, oats or pasta is about half a cup cooked. A fist of vegetables is around a cup. A thumb of fat, so oil, butter or nut butter, is close to a tablespoon.
Build a plate from that: one or two palms of protein, one or two cupped hands of carbs, a fist or two of vegetables, a thumb of fat. It takes no equipment and about two seconds.
Household objects, if you prefer objects
Some people find it easier to picture familiar things than parts of their own hand.
A tennis ball is about a cup. A deck of cards is close to a 3 ounce serving of meat. A golf ball is roughly two tablespoons, which covers nut butter and most dressings. A standard light bulb is about half a cup.
Measuring cups still beat all of this for anything you pour, and they cost almost nothing. Keeping one in the rice jar removes an entire category of guesswork.
The plate method
If counting anything at all sounds tedious, use the plate instead. Half of it goes to vegetables and fruit. A quarter goes to protein. The last quarter goes to grains or starch. Fat comes in through cooking and dressings, which is where it tends to hide anyway.
This works because it controls proportions rather than amounts, and for a lot of people the proportions are the actual problem. It does not work as well with mixed dishes, so a curry or a stir fry needs the hand method.
Adjust for what you did that day
Portions should not be identical on a rest day and after a two hour session. Add a cupped hand or two of carbs around hard training, and drop back on the days you barely move.
The rest of your food can stay the same. Protein and vegetables do not need to move much, and keeping them constant makes the whole thing simpler to run. If you want the underlying numbers, our activity factors show how much your daily total shifts between a sedentary day and a heavy one.
Learn to notice when you are full
Eyeballing portions works better when you are also paying some attention to your appetite. Eat slowly enough that fullness has time to register, and stop at satisfied rather than at finished.
That is not a substitute for portion sizes. Hunger is unreliable when you are stressed, short on sleep or eating something engineered to be moreish. But used alongside the hand method it catches the meals where your eyes were bigger than your requirements.
When to use a scale anyway
Buy one, use it for two weeks, then put it away. Weigh the five or six foods you eat most often and check your guesses against it.
Almost everyone is badly wrong about at least one thing, usually oil, cheese, peanut butter or cereal. Once you have recalibrated on those, your estimates will carry you the rest of the way, and you will not need the scale again until the next time you suspect yourself. If you are logging alongside this, our guide to tracking calories accurately covers the rest of the pitfalls.