Pet Food Portion Calculator

How this is calculated

⛔ THIS TOOL DOES NOT TELL YOU HOW MUCH TO FEED YOUR ANIMAL, AND IT SHOULD NOT. How much a pet should eat depends on its species, breed, age, neutering status, activity, body condition and any medical conditions it has, and the food's own calorie density varies enormously between products. The two authorities are the FEEDING GUIDE ON YOUR PARTICULAR FOOD and YOUR VET - and the vet outranks the label, especially for a growing, pregnant, elderly, overweight or unwell animal. Anything else, including this page, is arithmetic applied to their numbers. What this tool does is the part that genuinely is arithmetic, and it is the part that goes wrong: splitting a daily amount into meals, accounting for treats, converting between scoops and grams, and working out when the bag runs out. ⚠️ TREATS COME OUT OF THE DAILY TOTAL, NOT ON TOP OF IT. This is the single most common way a carefully-portioned pet gets overfed. Training treats, chews, dental sticks and the food used to hide a tablet all carry calories, and if the measured meals stay the same size the animal is simply eating more than the guide intended. The usual veterinary advice is to keep treats to a modest share of the daily intake and to reduce the meals accordingly - this tool does that subtraction, using whatever share you set. ⚠️ A SCOOP IS NOT A UNIT OF WEIGHT. Feeding guides are written in grams; scoops and cups are volume. How much a scoop holds depends on the kibble's size, shape and density, so the same scoop of two different foods can differ by a large margin, and switching foods while keeping the scoop is a real way to change the portion without meaning to. WEIGH ONE LEVEL SCOOP OF YOUR ACTUAL FOOD ON A KITCHEN SCALE and enter that here - it takes one minute and stays correct until you change food. A scale is also simply more accurate: for a small animal, being one scoop out is a substantial fraction of a day's intake. MEASURE, THEN CHECK THE ANIMAL, NOT THE OTHER WAY ROUND. A feeding guide is a starting point calculated for an average animal, and yours is not average. The thing to watch is body condition over weeks, and to adjust with your vet if the animal is gaining or losing when it should not be. The arithmetic here makes the portion CONSISTENT, which is what makes any adjustment meaningful - if the portion drifts week to week you cannot tell whether a change did anything. CHANGE FOOD GRADUALLY. If you are switching products, the daily gram figure will usually change because the new food's calorie density is different - read the new guide rather than carrying the old number across.

Common questions

How much should I actually feed my pet?

This tool will not tell you, and you should be wary of any that does. The right amount depends on species, breed, age, whether the animal is neutered, how active it is, its current body condition and any medical conditions - and on the calorie density of the specific food, which varies enormously between products. The two authorities are the feeding guide printed on YOUR bag and your vet, and the vet outranks the label, particularly for a growing, pregnant, elderly, overweight or unwell animal. What this page does is the arithmetic that follows once you have their number.

Why are treats subtracted instead of added?

Because they are food. Training treats, chews, dental sticks and the piece of cheese used to hide a tablet all carry calories, and if the measured meals stay the same size while treats go in on top, the animal is eating more than the feeding guide intended. That is the single most common way a carefully-portioned pet still gains weight, and it is invisible precisely because the meals are being measured so carefully. The usual veterinary advice is to keep treats to a modest share of daily intake and reduce the meals to match, which is what the subtraction here does.

Why does it ask me to weigh a scoop?

Because a scoop is a measure of volume and a feeding guide is written in weight, and the two only line up for one particular food. How much a scoop holds depends on the kibble's size, shape and density, so the same scoop filled with two different products can hold noticeably different amounts. That makes switching foods while keeping the scoop a quiet way to change the portion. Weighing one level scoop of your actual food takes a minute and stays correct until you change product - and for a small animal, being one scoop out is a large fraction of a day's intake.

Is the treat allowance in grams of treats?

No - it is in food-equivalent grams, meaning the amount of ordinary food whose place the treats are taking. Most treats are considerably more calorie-dense than complete food, so the actual weight of treats matching that allowance is usually smaller, sometimes much smaller. Treat packaging generally states calories, and if you want to be precise the comparison to make is calorie for calorie rather than gram for gram. Read the figure here as a generous ceiling rather than a target.

Why reorder a week early?

So a delayed delivery never forces a sudden change of food. Running out means an emergency trip for whatever the nearest shop stocks, and an abrupt switch is a common cause of digestive upset - which is both unpleasant for the animal and entirely avoidable. A week of buffer costs nothing beyond storing one bag slightly earlier than you otherwise would, and it also means a supplier being out of stock is a mild inconvenience rather than a problem you have to solve that evening.

My pet is gaining weight on the guide amount. What now?

That is a conversation with your vet rather than an adjustment to make from a website. Feeding guides are calculated for an average animal and yours is not average - neutered animals in particular often need meaningfully less than the label suggests. What this tool contributes is CONSISTENCY: if the portion is the same every day, then a change you and your vet make can actually be measured, whereas a portion that drifts week to week makes it impossible to tell whether anything you tried had an effect.

Does this work for cats as well as dogs?

Yes - the arithmetic is the same for any animal whose food comes with a feeding guide in grams, and the tool holds no species-specific assumptions at all. Two things matter more for cats in practice: portions are smaller, so scoop imprecision is a much bigger proportion of the total and a scale matters more; and cats are usually fed more meals a day, which the meals field handles. Water intake, which matters a great deal for cats on dry food, is outside anything this page can help with.

Take it further with AI

Copy this into ChatGPT or Claude with your own numbers filled in. It hands over the figures this calculator worked out, so the answer is built on real arithmetic instead of a guess.

I used the Pet Food Portion Calculator at https://www.bfcbrilliance.com/tools/pet-food-portion-calculator.

What I entered:
- Daily amount from your food's feeding guide (g): ___
- Meals per day (meals): ___
- Share of the daily intake given as treats (%): ___
- Weight of one level scoop of your food (g): ___
- Bag size (kg): ___
- Days you are planning for (days): ___

What it calculated:
- Food per meal: ___
- Food per day, after treats: ___
- Treat allowance per day: ___
- Scoops per meal: ___
- Days a bag lasts: ___

Use those figures as given — they are already worked out, so please don't recalculate or estimate your own. Help me turn them into a plan: what to buy or do, in what order, roughly what it should cost, and the mistakes people most often make with this job.

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