The raw dog food calculator above performs one specific piece of arithmetic. Raw feeding models do not dose food in kilocalories; they dose it as a percentage of the dog's body weight, and then they divide that daily mass into fixed fractions of muscle meat, raw edible bone, organ and, in the BARF variant, plant material. Enter a weight and a percentage and the tool returns the grams each fraction works out to, per day and per meal. That is the entire function of the page.
Arb Digital builds free calculators that show their working, and part of showing the working is being honest about what a model can and cannot tell you. This one cannot tell you whether a raw diet is appropriate for your dog, whether the resulting ration is nutritionally complete, or whether the food is microbiologically safe. Those are veterinary questions with a real evidence base behind them, and that evidence currently points away from raw feeding. The AVMA position and the US Food and Drug Administration's guidance on the risks of raw pet food diets are both worth reading in full before you use any number this page produces.
What This Raw Dog Food Calculator Does
It converts a body weight and a percentage into a daily mass, then splits that mass by four percentages. Nothing more. The default 2.5 percent and the 70/10/10/10 split are the figures most commonly quoted in raw-feeding literature, reproduced here so you can see what they imply in grams, not because this page endorses them.
The split percentages are editable. Choosing "custom" unlocks all four boxes so you can enter a different convention, and the tool reports the sum so you can see immediately if it does not come to 100. It will not quietly renormalise your numbers, because a split that does not add up is usually a transcription error you want to see rather than have corrected behind your back.
One boundary worth stating plainly. Our pet calorie calculator works in kilocalories and estimates a daily energy requirement from metabolic body weight. That is a different quantity computed a different way. This page does not estimate energy at all — it applies a percentage rule. If you want an energy figure, use the calorie tool; if you want to see what a raw model's percentage rule produces in grams, use this one.
The Veterinary Position, Stated Plainly
Raw feeding is a contested topic, and it is not contested evenly. Major veterinary organisations have published positions against it. The AVMA policy discourages feeding raw or undercooked animal-sourced protein to dogs and cats on the grounds of risk to both animal and human health, listing pathogens including Salmonella, Campylobacter, Listeria monocytogenes and pathogenic Escherichia coli. The FDA's literacy article reports that in its own sampling programme, raw pet food was more likely to be contaminated with disease-causing bacteria than other pet food types, and states that not feeding a raw diet is the single most effective way to avoid that exposure.
There is a second, separate risk that gets far less attention than pathogens: nutritional imbalance. A ration built from percentages is not a nutrient profile. Calcium-to-phosphorus ratio, vitamin D, vitamin A, iodine, zinc, copper, taurine and essential fatty acids are all quantities that a 70/10/10/10 split does not control. Too little bone and the calcium runs short; too much liver and vitamin A accumulates toward toxicity. Neither error announces itself for months.
The only person who can resolve that for a specific animal is a board-certified veterinary nutritionist — a veterinarian with specialist training in formulating diets, who can build a ration against published nutrient requirements and check it against the individual dog's age, condition and medical history. A percentage rule cannot do that, and neither can this page. If you are considering any home-prepared diet, cooked or raw, that referral is the step that actually addresses the problem.
How to Use It
- Enter the dog's current body weight in kilograms or pounds. Use the weight from a scale, not an estimate — the whole ration scales directly off this number.
- Set the daily percentage. The 2 to 3 percent range is what raw-feeding guides publish for weight-stable adults. Puppies, working dogs and dogs on a weight plan are all outside what a single percentage can represent.
- Pick a split model or choose custom and type your own four percentages. Watch the sum reported under the hero figure.
- Set meals per day to see the per-meal mass rather than only the daily total.
- Take the output to a veterinarian before it becomes a feeding plan. The numbers describe a model; only a clinician who has examined the dog can say anything about the dog.
The Formula and How It Is Calculated
The daily mass is D = W × p, where W is body weight in grams and p is the chosen percentage expressed as a fraction. For a 20 kg dog at 2.5 percent: 20,000 g × 0.025 = 500 g per day. Each component is then Cₓ = D × fₓ, where f is that component's fraction of the split. On the default BARF split that gives 350 g muscle meat, 50 g raw edible bone, 50 g organ and 50 g plant. Divided across two meals, each meal is 250 g with the same internal proportions.
Organ is split further because the conventions treat liver separately. Raw-feeding guides usually call for half the organ fraction to be liver and half to be another secreting organ such as kidney or spleen. In the worked example that is 25 g of liver and 25 g of other organ per day. The tool shows this breakdown under the hero line, since it is the fraction most often misread — "organ" in these models does not mean heart, which is treated as muscle meat.
Pound inputs are converted at 1 lb = 453.59237 g before any of this runs, so switching units changes only the displayed inputs and not the underlying arithmetic.
Why a Percentage of Body Weight Is a Weak Dosing Rule
Energy requirement does not scale with body mass. It scales roughly with metabolic body weight, conventionally body mass raised to the power 0.75. That exponent is the reason a 40 kg dog does not need twice the energy of a 20 kg dog — it needs closer to 1.7 times as much. A flat percentage rule assumes the exponent is 1.0, which means it systematically overshoots for large dogs and undershoots for small ones relative to any energy-based estimate.
The practical consequence is that the same 2.5 percent figure that keeps a 10 kg terrier steady will tend to overfeed a 45 kg dog on the same rule. Raw-feeding guides paper over this by suggesting the percentage be adjusted downward for large breeds and upward for small ones, which is really an admission that the percentage is a stand-in for an exponent it cannot represent. If you want to see how differently the two approaches behave, run the same dog through this page and through our pet calorie calculator and compare.
Fat content is the other missing variable. A gram of fat carries roughly twice the energy of a gram of protein, so two rations of identical mass can differ by a third or more in energy depending on how fatty the muscle meat is. A mass-based rule has no way to see that. This is why body condition, not the calculator, is what the model ultimately gets adjusted against — our pet body condition calculator covers how that nine-point scoring works.
Puppies, Seniors and Why the Percentage Changes
Growing dogs are the case where a single percentage is least defensible. A puppy's energy requirement per kilogram is far higher than an adult's and falls as it approaches mature size, so raw-feeding guides quote figures anywhere from 5 to 10 percent of current body weight for young puppies, stepping down through growth. Some guides instead dose against expected adult weight rather than current weight, which produces a completely different number from the same dog.
That ambiguity matters more for large breeds than small ones. Rapid growth and calcium excess are both implicated in developmental orthopaedic problems in large-breed puppies, and a bone fraction set by percentage rather than by measured calcium content is not controlling for either. If you are trying to work out where a puppy is heading, our puppy adult weight calculator handles the growth projection separately.
At the other end, older dogs commonly need less energy while keeping protein intake up, which a single percentage cannot express because it moves every fraction together. Reducing the percentage cuts protein at exactly the point in life when muscle maintenance matters most. This is a structural limitation of proportional dosing, not a tuning problem.
What the Split Percentages Do and Do Not Control
The bone fraction is the model's proxy for calcium. Raw edible bone is roughly one third mineral by mass, but the actual figure depends heavily on which bone: a chicken wing, a duck neck and a beef rib carry very different bone-to-flesh ratios. Two rations that both say "10 percent bone" can differ substantially in delivered calcium, and the calcium-to-phosphorus ratio — the quantity that actually matters — is not represented in the model at all.
The organ fraction is the model's proxy for micronutrients, and liver dominates it. Liver is dense in vitamin A, copper and B vitamins, which is why the convention caps it at half the organ share. Exceeding that is the classic error in home-prepared raw rations, and vitamin A accumulates rather than clearing, so the consequence builds slowly.
The plant fraction in BARF-style splits is where vegetables, fruit and sometimes seeds or supplements sit. It is the most variable part of the model between published guides, and it is the part with the least agreement about what it is for. Prey-model raw drops it entirely and redistributes the mass to muscle meat, which is why the two presets in this tool give different muscle figures for the same dog.
Reading the Output Honestly
The number in the hero box is a model output, not a prescription. Three questions decide whether it means anything for a particular dog: does the dog have a medical condition that changes its requirements, is the ration nutritionally complete against published requirements, and can this food be handled safely in this household. The calculator answers none of them.
Finally, cost. Raw rations are typically more expensive per kilogram than complete prepared diets, and the ongoing cost of a large dog on a mass-based rule is easy to underestimate until you multiply the daily figure by 365. Our pet insurance calculator and dog life expectancy calculator are useful for framing the horizon over which that cost runs.
Arb Digital publishes hundreds of free calculators across biology, chemistry, maths and finance — no sign-up, no limits. If something you need is missing, tell us and we will look at building it.
Browse All Free Tools Suggest a ToolCommon Mistakes to Avoid
- Treating a calculator output as a diet plan — the arithmetic is trivial; the nutritional adequacy and food safety questions it does not touch are the hard parts, and both belong with a veterinarian.
- Counting heart as organ — in these models heart is muscle meat. Counting it as organ displaces liver and other secreting organs and changes the micronutrient picture entirely.
- Exceeding half the organ fraction as liver — vitamin A accumulates rather than clearing, so the consequence of a long-running excess is delayed and easy to miss.
- Applying one percentage across every size of dog — energy scales with roughly the 0.75 power of body mass, so a flat percentage overshoots for large dogs and undershoots for small ones.
- Assuming that handling precautions remove the pathogen risk — the FDA's guidance is explicit that avoiding raw diets, not handling them carefully, is the measure that actually reduces exposure.
Related Free Tools From Arb Digital
Estimate a daily energy requirement in kilocalories with the pet calorie calculator, score condition on the nine-point scale with the pet body condition calculator, project a growing dog's mature size with the puppy adult weight calculator, and convert years with the dog age calculator. For sizing a crate to a measured dog, the dog crate size calculator does that job. The full free online tools hub lists everything else, and the Arb Digital blog covers how we build them.
Frequently Asked Questions
No. It shows what a raw or BARF feeding model computes from a body weight and a set of split percentages. Major veterinary bodies including the AVMA advise against feeding raw or undercooked animal protein to dogs, and the FDA reports higher rates of bacterial contamination in raw pet food than in other pet food types.
Most quote 2 to 3 percent of current body weight per day for a weight-stable adult dog, with higher figures for puppies. These are rules of thumb from raw-feeding literature rather than measured energy requirements, and they assume energy scales linearly with body mass, which it does not.
BARF splits the ration as roughly 70 percent muscle meat, 10 percent raw edible bone, 10 percent organ and 10 percent plant material. Prey model raw omits the plant fraction and uses roughly 80 percent muscle meat with the same bone and organ shares.
Liver is very dense in vitamin A and copper. Vitamin A accumulates in the body rather than clearing quickly, so a ration that runs consistently high in liver builds toward excess over months. The convention limits liver to half the organ share for that reason.
No. A split by mass does not control calcium-to-phosphorus ratio, vitamin D, iodine, zinc, copper or essential fatty acids. Only a formulation checked against published nutrient requirements does that, which is work for a board-certified veterinary nutritionist.
A board-certified veterinary nutritionist. That is a veterinarian with specialist training in diet formulation who can build a ration against nutrient requirements and check it against the individual animal's age, body condition and medical history. No calculator can substitute for that assessment.
Yes. Switch the unit selector to pounds and the weight is converted at 1 pound to 453.59237 grams before the ration is computed. All component outputs are shown in grams regardless of the input unit.
Because they are shares of one daily mass. If they sum to anything else the components will not reconstruct the total. The tool reports the sum rather than rescaling silently, so a typo shows up instead of being absorbed into the answer.
This calculator is provided for education and general reference only. It is not veterinary advice and is not a recommendation to feed a raw diet. Feeding decisions for an individual animal should be made with a veterinarian, and diet formulation with a board-certified veterinary nutritionist.
