The SCRFD PMR foundation ratios calculator is not like other boilerplate calculators found elsewhere online

This calculator was built to help ratio feeders establish the PMR foundations needed to build a robust raw diet. It will take the vital data you input and the correct math formulation to configure the appropriate amounts of food for each foundation ratio. It is important to use nutritional requirements appropriate for the canines we domesticated, as a tool to build ratios with. Once you have a grasp on how much your dog should eat, the next step is to learn what it should eat. Adding other foods to the bowl is important for your dog to optimally thrive.

The SCRFD PMR foundation ratios calculator was built to adjust the bone ratio 

10% Bone is the Baseline Not the Rule

It has been observed “in the wild,” that dogs consume whole prey animals as small as quail and as large as deer. Yes, they do eat larger animals, such as cow and bison but deer are typically the largest animal they fully consume with the exception of antler.

We have information from both the USDA nutrition database about quail being comprised of 10% bone and also the Canada Health database computing the same information about the percentage of bone in quail. This is the baseline of bone information for undressed whole game birds.

Whole Pheasant is also in the USDA database at 14% bone and as with quail, it is the same information in the Canadian database too. 

The average of 10% and 14% = 12%

We also have information about deer. Deer is typically the largest wild/whole prey animal that is fully consumed by dogs (with the exception of antler), with data reported from the Pennsylvania State University Department of Dairy and Animal Science, and the Pennsylvania Game Commission reflecting as much as 13.8% in young deer & fawns and as low as 11.7% in adults refuse (ie, bone) percentages. 

 The average of 11.7% and 13.8%  = 12.75%

For ratio feeding, in order to give enough calcium and keep a good overall balance in a typical adult dog, it should be fed 10%-15% bone.

Bone is the most common ratio that ratio raw feeders report they are unsure if their dog is getting the correct amount of. If you are a ratio feeder and your adult dog’s stool is too loose or wet at 10%, you can adjust up to see if the issue is corrected at 12%. Too dry? Adjust down, using 10% as your baseline. Typical system adult canines are reported to do best at 12%-13% bone on a ratio diet.

Careful consideration should be paid to any known possible skeletal abnormalities that are breed specific and adjustments made accordingly.

Raw Info: Often it’s found the 5% liver ratio is too high for many dogs in terms of vitamin A contribution. Too much of this organ may be a contributing factor to loose stool. Before making adjustments to the bone (calcium), consider reducing the 5% liver first and observe following stools over the next couple of days.

How the Calculator Works

This calculator allows you to adjust your dog’s bone ratio using the 10%-15% guideline. The vital information you provide about your dog and the bone % you select, will configure the appropriate PMR ratios for you to use as the foundation to build your dog’s raw diet from.

*SCRFD does not advise ratio feeding for puppies, gestation, lactation, therapeutic cases, canine athletes, working dogs, or sled dogs.

 Visit the raw feeding puppies guide by clicking or pressing here to learn about raw feeding puppies.

Learn about appropriate nutrient levels for skeletal development in large & giant breed puppies here.

Additional Calculators:

Pounds to Kilograms Calculator (Needed for the Caloric Feeding/kCals Calculator)

Caloric Feeding/kCals Calculator

NRC Nutrient Requirements / ME Calculator for Adult Dogs


National Research Council (NRC, 2006 Edition)

Steve Brown, Retired Raw Diet Expert + Formulator

Dana Scott, Natural Rearing Labrador Breeder + Editor in Chief of Dogs Naturally Magazine

USDA Nutrition Database  

Canada Health Database

Pennsylvania State University Department of Dairy and Animal Science and the Pennsylvania Game Commission

SoCal Raw Fed Dogs Raw Feeding Survey (May 2018)