How This Calculator Works
Most free calculators feed your dog a flat percentage of body weight. This one uses the same calorie-based method as veterinary nutritionists. It starts from your dog's Resting Energy Requirement (RER), the NRC 2006 formula RER = 70 × kg0.75, then multiplies by a life-stage and activity factor to reach the Metabolic Energy Requirement (MER), the calories your dog actually burns per day. Those calories are converted to a daily food weight and split into PMR or BARF component amounts. Note: this tool tells you how much to feed, not whether your specific ingredients are NRC 2006 complete. See our dog daily calorie guide for the full method.
Why This Calculator Is Different
Most free raw calculators stop at a percentage rule. Here is how the NRC 2006 approach compares. Every difference below is a verifiable feature, not a claim. Unlike percentage-based calculators, this is the only free raw dog food calculator that uses NRC 2006 metabolic scaling, covers adult, puppy and senior dogs, applies a senior sarcopenia floor, and shows its formula on-screen.
| Feature | This calculator | Typical free calculators |
|---|---|---|
| Energy method | NRC 2006 metabolic (RER = 70 × kg0.75) | % of body weight |
| Life stages | Adult, puppy & senior | Usually adult only |
| Senior sarcopenia floor | Yes (1.4 × RER anchor) | Not addressed |
| Diet models | PMR and BARF | One or none |
| Formula shown on-screen | Yes | No |
This calculator
- Method: NRC 2006 metabolic scaling (RER = 70 × kg0.75)
- Life stages: adult, puppy & senior
- Senior support: sarcopenia floor (1.4 × RER anchor)
- Diet models: PMR and BARF
- Transparency: formula shown on-screen
Typical free calculators
- Method: % of body weight
- Life stages: usually adult only
- Senior support: not addressed
- Diet models: one or none
- Transparency: formula not shown
NRC 2006 Factors Used by This Calculator
Every multiplier below is applied exactly as shown, the same NRC 2006 metabolic factors a veterinary nutritionist uses. Daily energy = RER × the life-stage and activity factor, where RER = 70 × kg0.75. Food weight = daily kcal ÷ 1.5 kcal/g.
| Life stage | Setting | Factor applied |
|---|---|---|
| Adult | Inactive / weight-loss | 95 × kg0.75 |
| Light (occasional walks) | 110 × kg0.75 | |
| Moderate / active | 130 × kg0.75 | |
| Sporting / working | 160 × kg0.75 | |
| High-intensity working | 200 × kg0.75 | |
| Adult goal modifier | Lose weight | × 0.8 |
| Maintain | × 1.0 | |
| Gain weight | × 1.1 | |
| Senior | Low activity | 1.35 × RER |
| Medium activity | 1.57 × RER | |
| High activity | 1.85 × RER | |
| Very high activity | 2.28 × RER | |
| Senior floor | Sarcopenia anchor (minimum) | 1.4 × RER |
| Puppy | Under 4 months | 3.0 × RER |
| 4 months to maturity | 2.0 × RER | |
| Food density | Raw diet energy density | 1.5 kcal/g |
PMR or BARF: Which Diet Model?
PMR (Prey Model Raw) is 80% muscle meat, 10% raw meaty bone, 5% liver, and 5% other secreting organ, with no plants. BARF (Biologically Appropriate Raw Food) shifts to 70/10/5/5 and adds 10% vegetables and fruit. Both are supported here; the right choice comes down to personal preference and how your dog tolerates plant matter. For a full breakdown read BARF vs PMR.
How Much Raw Food Does a Puppy Need?
Puppies burn far more energy per kilo than adults. This calculator uses simplified NRC age brackets so you don't need to estimate adult weight:
| Age | NRC factor | Approx. % body weight |
|---|---|---|
| Under 4 months | 3.0 × RER | ~8–10% |
| 4 months to maturity | 2.0 × RER | ~3–5% |
Large and giant breeds should sit at the conservative end to protect joint and bone development. Puppy estimates vary with breed size and growth rate, so confirm with your vet. More detail: raw feeding puppies.
Raw Feeding for Senior Dogs: What Changes?
Senior dogs are not simply fed less. NRC 2006 sets a floor of 1.4 × RER to prevent sarcopenia, the age-related muscle loss. Drop below it and an older dog loses lean mass even while gaining fat. This calculator applies that anchor automatically, so a senior result is never under-fed. Most free calculators don't address seniors at all. See raw feeding for senior dogs.
Methodology & Disclaimer
Calorie math follows NRC 2006, Nutrient Requirements of Dogs and Cats (National Academies Press, catalog 10668), using metabolic scaling (RER = 70 × kg0.75) rather than a flat percentage of body weight. Food weight assumes a typical raw diet density of ~1.5 kcal/g; actual density ranges 1.3–1.8 kcal/g with fat content, so treat grams as an estimate. This tool provides feeding amount estimates only, not a nutritional completeness analysis. Individual dogs vary: monitor body condition, energy, and coat quality and adjust accordingly. For full NRC micronutrient compliance (calcium-to-phosphorus balance and all 43 NRC nutrients), use the Raw & Well app. Background reading: calcium:phosphorus ratio and percentage vs metabolic feeding.
Frequently Asked Questions
How much raw food should I feed my dog per day?
A 25kg moderately active adult dog needs roughly 1,450 kcal/day, which at a typical raw diet density (~1.5 kcal/g) works out to about 950–1,000g of raw food per day. Smaller, older or less active dogs need less; this calculator gives the exact figure for your dog instead of a generic percentage of body weight.
Is the 2–3% body weight rule accurate for raw feeding?
It's a rough starting estimate. The NRC 2006 Kleiber formula (RER = 70 × kg^0.75) is more accurate because it accounts for metabolic scaling: larger dogs need proportionally less food per kg than smaller dogs. This calculator uses the NRC formula, not the percentage rule.
What is the difference between PMR and BARF raw feeding?
PMR (Prey Model Raw) uses 80% muscle meat, 10% raw meaty bone, 5% liver, 5% other organ. BARF (Biologically Appropriate Raw Food) adjusts to 70/10/5/5 and adds 10% vegetables and fruit. Both are supported in this calculator.
How much raw food does a puppy need?
Puppies under 4 months need approximately 3× their Resting Energy Requirement per day. From 4 months to maturity they need approximately 2× RER. Puppies need significantly more food relative to body weight than adult dogs to support growth.
How much raw food does a senior dog need?
Senior dogs need at minimum 1.4× their RER per day. This floor prevents muscle loss (sarcopenia). More active seniors may need up to 2.28× RER. Do not reduce senior dog food below this floor even if they seem less hungry.
Does this calculator tell me if my raw diet is nutritionally complete?
No. This calculator tells you how much to feed (daily grams and ratios). Whether your specific ingredients meet NRC 2006 targets for calcium, phosphorus, and 40+ other nutrients (43 in total) requires a full micronutrient analysis, available in the Raw & Well app.
What is NRC 2006 and why does it matter for raw feeding?
NRC 2006 refers to "Nutrient Requirements of Dogs and Cats" published by the National Academies Press in 2006. It is the primary scientific reference for canine nutritional requirements used by veterinary nutritionists. The calorie formula and nutrient reference amounts in this calculator are sourced from NRC 2006.
How do I convert my dog's daily calories to grams of raw food?
Divide daily kcal by the energy density of your raw diet. A typical raw diet provides approximately 1.5 kcal per gram (range: 1.3–1.8 kcal/g depending on fat content). A dog needing 900 kcal/day needs approximately 600g of raw food. This calculator applies the 1.5 kcal/g estimate automatically.
The free calculator tells you how much. The app tells you if it's enough.
Check your raw diet against all 43 NRC nutrients, freeSources & References
- National Research Council. Nutrient Requirements of Dogs and Cats (2006). National Academies Press. Catalog 10668: the source of the resting energy formula (RER = 70 × kg0.75) and the NRC nutrient reference values used throughout this tool.
- Dillitzer, N., Becker, N., & Kienzle, E. (2011). Intake of minerals, trace elements and vitamins in bone and raw food rations in adult dogs. British Journal of Nutrition, 106(S1), S190–S192. DOI: peer-reviewed evidence that home-formulated raw diets frequently miss micronutrients, which is why a completeness check matters.
This calculator provides general feeding estimates based on NRC 2006 energy formulas and is not a substitute for individualised veterinary advice. Always monitor your dog's body condition and consult your veterinarian for medical or dietary concerns.