Meal Prep Recipe Scaler

What the scaler does

Most recipes serve four. Most meal preppers want five, ten or fourteen portions. The scaler multiplies every ingredient by the same factor, which is your target servings divided by the recipe's servings. It also adds up the protein you enter for each ingredient, so you can see total protein and protein per container.

You can rename ingredients, change quantities, add rows and use any unit you like, as long as you're consistent. The scaled column uses the same unit as the original.

Worked example

The default recipe serves four:

Scaled to 10 servings, the factor is 10 ÷ 4 = 2.5:

Total protein is 575 g, or 57.5 g per serving. If that's more than you want per container, you can scale to 12 servings instead. You'll get about 47.9 g each with the same shopping list.

The protein figures for these defaults come from typical reference values: about 19 g per 100 g of raw boneless chicken thigh, 24 g per 100 g of dry lentils and 10 g per 100 g of plain Greek yogurt. Use your own labels for accuracy.

Getting good results from big batches

Weigh, don't guess

Volume measures like cups and spoons scale badly. A kitchen scale makes scaled recipes repeatable.

Divide the batch evenly

After cooking, weigh the whole pot and divide by the number of servings. Then weigh each container to that amount. This is the only way to make "protein per container" true in practice.

Mind food safety

Cool cooked food quickly and refrigerate it. Most food safety agencies suggest eating refrigerated cooked leftovers within a few days, and freezing anything you won't reach in time. Check your own country's food safety guidance.

Batch the base, vary the topping

Ten identical lunches get boring. Cook a scaled base of protein and grain, then vary the sauces and vegetables across the week.

How to use the scaler, step by step

1. Enter how many servings the original recipe makes.
2. Enter how many servings you want.
3. Type each ingredient, its quantity and its protein in grams. Find protein on labels or in a database such as USDA FoodData Central.
4. Add rows for every ingredient that contributes protein. You can skip spices and minor items, or include them with zero protein to scale them too.
5. Read the scale factor, scaled quantities, total protein and protein per serving.
6. Shop and cook using the scaled column.

Scale factors at a glance

Worked example: a tofu stir-fry for the week

A made-up recipe serves 2. You want 7 portions, one per day. The factor is 7 ÷ 2 = 3.5. Protein values are approximate: about 17 g per 100 g of firm tofu, 2.7 g per 100 g of cooked rice, 11 g per 100 g of shelled edamame and 2 g per 100 g of mixed vegetables.

Total protein is about 352.1 g, or 50.3 g per portion. Adding 100 g more tofu per original recipe (350 g more in the scaled batch) would add about 59.5 g of protein, or about 8.5 g per portion.

Ingredients that don't scale neatly

Most ingredients scale in a straight line, but a few need judgement:

The scaler shows the exact maths. These notes are about cooking practice, which is always a little more flexible.

Worked example: scaling down for one

A made-up chili recipe serves 6 and you cook for one, with leftovers for one more day. Scale to 2 servings: the factor is 2 ÷ 6 = 0.333.

The tomatoes don't scale neatly to tin sizes. Using a full tin and cooking it down a little longer is easier than measuring two-thirds of a tin, and it only changes the protein figure slightly, since tomatoes add little protein. Enter the practical amounts back into the scaler so the totals match what you cooked.

Scaling for different appetites

Not everyone in a household eats the same portion. One approach is to scale for "portion units" instead of people. If one person eats one and a half normal portions, count them as 1.5 servings. For three people with appetites of 1, 1 and 1.5 portions, eating twice a day for three days:

servings = (1 + 1 + 1.5) × 2 meals × 3 days = 21

Then divide the cooked batch by weight into 21 equal units, and give each person their share. The protein per unit tells everyone how much they're getting.

Using the scaler for trail food

The scaler is just as handy for backpacking. Scale a dehydrated dinner or a breakfast mix to the number of trail days, then weigh it into bags. Use dry weights for anything you'll rehydrate on the trail, because that's what you carry. For trail-specific calorie and weight targets, start with the backpacking food weight calculator and the trail meal planner.

Keeping a recipe log

Once a scaled recipe works, write it down with the scaled amounts, the final cooked weight, the portion weight and the protein per portion. Next time, you can skip the maths and shop straight from the log.

Checking your scaled batch

After cooking a scaled recipe, run three quick checks:

If you don't know the empty pot's weight, weigh it once and write it on a piece of tape on the handle. It saves guessing every week. Do the same for your largest mixing bowl and your favourite containers, so a quick weigh tells you exactly how much food is inside without emptying anything. It's a small habit that makes portioning quick and accurate every time.

Scaling and cooking equipment

Big batches need big equipment. A recipe scaled from 4 to 14 servings has 3.5 times the volume, which may not fit a standard pot or a single oven tray. Overcrowded trays steam instead of roasting, and overfilled pots cook unevenly. When the scaled amounts look large, split the batch across two pots or trays, or cook in two sessions. The scaler's numbers stay the same; only the cooking method changes.

Slow cookers, pressure cookers and large sheet pans make batch cooking easier, but check their maximum fill lines. Pressure cookers in particular have a safe maximum, often marked inside the pot, that shouldn't be exceeded.

Freezing scaled batches

Freezing lets you scale bigger without eating the same meal every day. Most cooked grain, bean and meat dishes freeze well, though textures can change: rice can dry slightly, and creamy yogurt sauces can split, so add those fresh after reheating. Freeze portions flat in bags or in individual containers so they thaw evenly. Label each with the dish, the date and the protein per portion from the scaler. Many food safety agencies advise thawing in the fridge rather than on the counter, and reheating until the food is steaming hot all the way through.

Planning containers

Before scaling, think about how you'll store the batch:

• Number of containers: match your scaled servings.
• Container size: a portion of a grain-and-protein bowl often needs about a 700 ml to 1 litre container.
• Fridge vs freezer: split the batch into portions you'll eat within a few days and portions to freeze.
• Labelling: write the date and the protein per serving on the lid.

Unit tips

The scaler works with any unit, but mixing units in one row causes errors. Common fixes:

• Convert cups and spoons to grams once, and use grams from then on.
• For eggs, use the number of eggs as the quantity and the protein per egg (about 6 g for a large egg) times that number.
• For tins, use the drained weight if you're draining them.

Common mistakes

1. Raw vs cooked weights. If the recipe gives raw chicken, use raw protein values.
2. Forgetting to scale sauces. They're part of the meal and often add protein, such as yogurt or peanut sauces.
3. Skipping the final weigh. Uneven portions make the "per container" figure meaningless.
4. Scaling too far. A 14-portion batch may not fit your pot or your fridge. Cook in two batches.
5. Keeping food too long. Freeze what you won't eat within a few days.

Glossary

• Scale factor: target servings divided by original servings.
• Serving / portion: one container's worth of the finished dish.
• Batch: the full scaled quantity cooked at once.

Related tools

• Protein cost calculator: find the cheapest protein for the batch.
• Protein density calculator: check protein per calorie for each ingredient.
• Trail meal planner: plan trail meals with the same per-portion approach.

Improving protein per serving

If your per-serving figure is low, you have three main options:

1. Raise the protein ingredients. Scale chicken or lentils while keeping everything else the same.
2. Swap in protein-dense sides, such as Greek yogurt sauces, edamame or cottage cheese.
3. Lower the servings count. Each container gets more food, and more protein with it.

To compare the cost of these changes, use the protein cost calculator. For complete weekly plans, see our 7-day high-protein meal prep plan.

Scaling down, too

The scaler works in both directions. If you cook for one, a four-serving recipe scaled to two gives a factor of 0.5. Small amounts can get awkward, like half an egg or a quarter of an onion. In those cases, round to something practical and accept that the protein figure is approximate. Writing the rounded amounts back into the table updates the totals, so your record matches what you actually cooked.