Packing packed lunches can feel like guesswork. What is enough for growing children without wasting food? This guide lays out five simple portion rules to help children get the energy and nutrients they need at each age.
Find out how to match portions to your child's development stage, build balanced packed lunches, use simple visual cues, and adjust portions for activity, appetite and preferences. Try practical examples and quick tips to cut food waste, ease mealtime stress and keep little ones energised throughout the day.
1. Prioritise portion sizes for growth and energy
A handy trick is to use simple visual cues to size portions by age and appetite: a palm-sized portion of protein, a cupped hand of carbohydrates, a fist of vegetables and a thumb-sized amount of concentrated fats. Halve those cues for younger children, and as appetite or activity increase match an adult palm. Combine carbohydrates with protein and a little fat to keep energy steady through the school day; for example, a wholegrain sandwich or wrap with a protein and a small pot of hummus or avocado, or fruit paired with yoghurt or a boiled egg to slow the release of glucose. For small eaters or growth spurts, add compact, nutrient-dense extras such as a sprinkle of seeds, grated cheese, lentils folded into sauces, or a small pot of nut butter or full-fat yoghurt when extra energy is needed.
Scale portions to your child’s activity and growth rather than the clock. On very active days or during growth spurts, offer a little extra carbohydrate and protein, or tuck a second portable snack into their packed lunch if they prefer grazing. Let them ask for a second helping when they are still hungry and use leftovers to cut down on waste. Watch how long their energy lasts at school to spot patterns, and make small adjustments across a week instead of reacting to a single day. These simple habits help you fine-tune portions so lunches reliably meet changing energy and growth needs.
Plan weekly lunches to balance portions and snacks.
2. Match portion sizes to your child's age and appetite
Try the palm, fist and thumb method to gauge portions: a child’s palm for protein, a closed fist for starchy carbohydrate and a thumb for fats. For toddlers aim for about half a palm, half a fist and a thumb; for young children one palm, one fist and one thumb; and older children and teens can increase to around one to one-and-a-half palms, one to two fists and up to two thumbs. These simple visual measures let carers adjust portions quickly without weighing food and show growth when you check progress over time. Pack protein into a palm-sized compartment, starchy foods into a fist-sized space, and use small pots for spreads and yoghurt. Colour-code or label sections so teachers or childminders can check the balance at a glance. On sporty or busy back to school days, add an extra fist of carbohydrate or an extra palm of protein; on quieter days reduce starchy portions and fill the box with veg.
Make portions concrete with one-line examples: - Toddlers: half a sandwich or a few small crackers, a spoonful of mashed avocado, a couple of soft veg pieces and a teaspoon of full-fat yoghurt. - Young children: one sandwich or a small wrap, a handful of carrot batons and grapes, a small pot of yoghurt and a boiled egg or a portion of cheese. - Older children: a larger sandwich or a pot of pasta, two portions of fruit or veg, a yoghurt or cottage cheese pot and a denser snack such as a flapjack or a nut-free seed mix. - Teens: a substantial sandwich or a portion of rice or pasta, two to three portions of fruit or veg, a larger protein portion and a calorie-dense snack if very active. Track appetite over a week and adjust portions gradually if a child regularly returns food or asks for more. Rotate proteins and swap fruits and veg to keep meals interesting, split portions for fussy eaters, and offer one new item alongside two familiar ones to broaden tastes while keeping waste low.
Plan weekly bento-style lunches quickly with our printable
3. Assemble a balanced, colourful lunchbox the kids will love
Try simple visual cues that grow with your child to guide portions: a palm-sized portion of protein, a fist-sized portion of starchy carbohydrate, a cupped-hand of vegetables or fruit, and a thumb-sized spoon of healthy fat. Aim to include at least one colourful vegetable or fruit every day and vary textures to help acceptance. Fibre from raw or cooked veg, grated courgette or whole fruit steadies energy and supports digestion, which can help concentration at school. Add a source of protein or calcium to every lunchbox, such as yoghurt, a hard-boiled egg, cold cooked chicken, beans or a portion of cheese, because protein helps maintain focus between meals and reduces mid-afternoon hunger.
Include a small portion of healthy fat to support brain development and help absorb vitamins, for example mashed avocado, a spoonful of hummus or a sprinkle of seeds. If schools restrict nuts, try seeds or seed butters instead. Make the packed lunch easy to eat and inviting by cutting food into bite-sized pieces for little ones, using separate compartments or silicone pots to keep flavours apart, and swapping dips to nudge more veg on to the plate. Let your child help with packing and use simple visual measures to scale portions as they grow, which helps avoid overfilling or underfeeding and makes it more likely they will eat what you pack.
Download a weekly planner to map balanced, compartmented lunches.
4. Use visual cues to portion and pack lunches
A handy trick is to use your child's own hand to size portions: a palmful for protein, a cupped hand for starchy foods, a fist for fruit and veg, and a thumb for fats. That way portions scale naturally as they grow, so you can skip the scales. Turn the method into household comparisons to make it easier at busy mornings — for example, a fist-sized apple is one portion of fruit, a handful of pasta or rice makes a starchy portion, and a palm-sized slice of cheese or cooked meat counts as protein. Use clear compartment boxes or colour-coded lids to give each food group its own space; this helps children recognise a balanced lunch and stops one item dominating the lunchbox.
Pop a laminated photo card inside the lunchbox lid showing an age-appropriate packed lunch, and invite your child to match what you pack to the picture. It takes the guesswork out of decisions and speeds up the routine. Mark fill lines or use removable dot stickers on reusable containers to show small, medium and large portions for different ages, so you can adjust servings as appetites change. At the end of the day, check what comes home and use that to fine-tune portions, moving the marks after a few days if needed. These little visual cues and simple tools shave time off packing, keep portioning consistent as children grow, and make it easier for you and your child to spot if a lunch is missing something, whether that is a piece of fruit, a starchy item or a source of protein.
Pack balanced, temperature-controlled meals with a four-compartment set.
5. Tailor portions to your child's activity, appetite and preferences
Try a hand-size visual guide to scale portions for packed lunches and snacks. For toddlers, pack about half a palm of protein, a small fist of carbohydrate and a couple of tablespoons of veg. For primary-age children, aim for one palm of protein, one fist of carbohydrate and a small handful of veg. For secondary pupils, increase to one and a half palms of protein, a larger fist of carbohydrate and a generous handful of veg, and add an extra cupped handful snack on high-activity days. Match portions to planned activity by swapping rather than simply adding food. On PE or after-school club days, boost carbohydrate portions with an extra sandwich half, a pasta salad or a banana to top up energy. On quieter days, favour slightly smaller carbohydrate portions and increase vegetables, protein and healthy fats to support concentration and steady energy. Use appetite cues instead of rigid rules. Offer build-your-own components in consistent small serving sizes so children learn to stop when comfortably satisfied, and pack a small separate snack so hungry children can help themselves. Check leftovers regularly to learn each child’s typical intake and adjust future portions accordingly.
Try packing one familiar favourite, one small portion of something new, and one neutral item such as bread or yoghurt. To help new foods land, vary texture and presentation: grate courgette or carrot into sandwiches, offer dips with chopped veg, or toss together a mixed salad. Keep a simple note of what you see coming home uneaten, signs of low energy, or requests for extra food. Use those observations to adjust portion sizes, change how you pack items, and refine which snacks you send. If activity levels rise, share your notes with teachers or coaches so the lunchbox matches the day’s needs.
A well packed lunch balances energy and nutrients with a few simple, repeatable rules, so children eat enough without creating unnecessary waste. Practical tools such as hand-sized portion guides and a weekly look through leftovers help you tweak portions as your child grows, on busier days, or when their appetite changes.
Use these five simple headings to guide what you pack each day: prioritise portion sizes, match portions to age, assemble balanced lunch boxes, use visual cues, and adjust for activity. Try the steps with your child, involve them in decisions, and tweak portions across a week to reduce waste and keep them energised and focused.