Dog Food Nutrition Calculator
Dry Matter Calculator for Dog Food
Use this dry matter calculator to convert dog food label values from as-fed to dry matter basis in seconds. If you want to calculate dry matter for protein, fat, fiber, or estimated carbohydrates, this tool helps you compare foods more fairly by removing the effect of moisture. It is especially useful when comparing dry kibble, canned food, fresh food, and other diets with very different water content.
This page is built as an editorial comparison tool, not a scoring tool. It focuses on moisture-normalized label math and clear explanations.
Primary use
Dry matter conversion
Required input
Moisture %
Optional output
Carbs by difference
Best for
Wet and dry foods
On This Page
Dry Matter Calculator
Enter the guaranteed analysis values from your dog food label to see the nutrient levels on a dry matter basis. This makes dry matter calculations easier and gives you a better way to compare foods that would otherwise look very different on the label.
Results
Dry Matter
—
As-fed moisture: —
Percent of the food that is not water
Protein (DMB)
—
As-fed protein: —
Converted from as-fed protein
Fat (DMB)
—
As-fed fat: —
Converted from as-fed fat
Fiber (DMB)
—
As-fed fiber: —
Converted from as-fed fiber
Ash (DMB)
—
Ash used (as-fed): —
Shown if entered or estimated
Carbs (DMB)
—
Carbs (as-fed): —
Estimated by difference
Want to see how dry matter comparisons apply to real foods? Browse our dog food reviews.
What Dry Matter Basis Means
What is dry matter?
Dry matter is everything in the food except water. When moisture is removed, the remaining nutrients can be compared on a more equal basis. This is why dry matter values are often more useful than the numbers shown directly on the label.
As-fed vs dry matter
Dog food labels are listed on an as-fed basis, which means the nutrient values include moisture. A canned food can look lower in protein than a dry food simply because it contains much more water. Converting to dry matter basis removes that distortion.
Why moisture matters
Moisture changes how nutrient percentages appear on the label. The more water a food contains, the lower its protein and fat may seem at first glance. That is why an as fed to dry matter calculator is so useful when comparing different types of dog food.
Why Use a Dry Matter Calculator?
Compare foods more fairly
A dry kibble and a canned food should not be compared using label percentages alone. A dry matter basis calculator helps put them on the same footing so the comparison is more meaningful.
See the real nutrient concentration
When water is removed from the equation, protein, fat, fiber, and other nutrients become easier to understand. This helps you see how concentrated a food really is.
Make better buying decisions
Dry matter values can help you judge whether a food truly offers the nutrient profile you expect. This is useful when comparing premium foods, budget foods, wet foods, or fresh diets.
Understand label numbers better
Many people ask, “how do you calculate dry matter?” or “why do these label percentages look so different?” This calculator gives you the answer quickly and shows what those numbers mean in practical terms.
How to Use This Calculator
Enter the as-fed values
Type in the nutrient percentages from the guaranteed analysis on the label, including protein, fat, fiber, moisture, and ash if it is listed.
Run the calculation
Click Calculate Dry Matter and the tool will remove moisture from the formula so the nutrients are shown on a dry matter basis.
Compare the results
Use the dry matter values to compare different foods more accurately. This is especially helpful when one food is dry and another is canned or fresh.
How the Dry Matter Calculator Works
Step 1: Calculate dry matter percentage
To find the dry matter portion of a food, subtract the moisture percentage from 100.
Dry Matter % = 100 – Moisture %
If you have ever wondered how do you calculate dry matter percentage, this is the first step.
Step 2: Convert each nutrient to dry matter basis
Once you know the dry matter percentage, divide the as-fed nutrient value by the dry matter percentage and multiply by 100.
Dry Matter Nutrient % = (As-Fed Nutrient % ÷ Dry Matter %) × 100
This is the standard method used when calculating dry matter for protein, fat, fiber, or other nutrients.
Worked Examples
Example: Dry dog food
A dry food lists 26% protein and 10% moisture on the label.
Dry matter percentage = 100 – 10 = 90
Protein on a dry matter basis = 26 ÷ 90 × 100 = 28.9%
Even though the label says 26% protein, the food contains about 28.9% protein on a dry matter basis.
Example: Canned dog food
A canned food lists 9% protein and 78% moisture on the label.
Dry matter percentage = 100 – 78 = 22
Protein on a dry matter basis = 9 ÷ 22 × 100 = 40.9%
This is why canned foods often look lower in protein at first glance, even when they may be higher once converted to dry matter basis.
An as-fed label can be misleading when moisture levels are very different. A dry matter calculator helps reveal the real comparison.
Important Limitations
Guaranteed analysis is not exact composition
These results are based on the guaranteed analysis shown on the label, not a full laboratory breakdown. Protein and fat are usually listed as minimums, while fiber and moisture are usually listed as maximums.
Carbohydrates are estimated
Most dog food labels do not list carbohydrates directly. They are usually estimated by difference, which means the final result is still an approximation.
Learn more about how dog food carbohydrates are estimated.
Dry matter is only one part of the picture
Dry matter basis helps compare nutrient concentration, but it does not tell you everything about ingredient quality, digestibility, calorie density, or whether a food is right for your dog.
Frequently Asked Questions
A dry matter calculator is a tool that converts nutrient values from the label’s as-fed basis to a dry matter basis. It helps you compare dog foods more fairly by removing moisture from the equation.
To calculate dry matter, subtract the moisture percentage from 100. For example, if a food contains 75% moisture, the dry matter percentage is 25%.
If you are asking how do you calculate dry matter percentage, the formula is simple:
Dry Matter % = 100 – Moisture %
This tells you how much of the food remains once water is removed.
If you want to know how to calculate crude protein on a dry matter basis, divide the as-fed protein percentage by the dry matter percentage, then multiply by 100.
Example:
Protein = 10%
Moisture = 75%
Dry matter = 25%
Protein on a dry matter basis = 10 ÷ 25 × 100 = 40%
Dry matter basis gives you a more meaningful comparison when foods have different moisture levels. Without it, a canned food may seem lower in protein or fat simply because it contains much more water.
Yes. This page works as an as fed to dry matter calculator for dog food. It takes the label values you see on the package and converts them into dry matter values so you can compare foods more accurately.
If you want to know how to calculate as fed from dry matter, use the reverse formula:
As-Fed % = Dry Matter % × Dry Matter Fraction
For example, if protein is 40% on a dry matter basis and the food is 25% dry matter, the as-fed protein value is 10%.
Yes. Although this page is mainly built as a convert as fed to dry matter calculator, the reverse method can also be used as a convert dry matter to as fed calculator or dry matter to as fed calculator when needed.
Because canned foods usually contain much more moisture than dry foods. Water lowers the as-fed percentages on the label, even when the food may be nutrient-dense once converted to dry matter basis.
No. Dry matter basis helps compare nutrient concentration, but it does not confirm whether a food is complete, balanced, appropriate for a life stage, or made with high-quality ingredients.
Editorial Note
Dry matter basis is one of the most useful ways to compare dog food labels, but it should not be used on its own. A complete evaluation should also consider ingredient quality, nutrient balance, calorie density, digestibility, price, labeling practices such as ingredient splitting, and whether the food is suitable for a dog’s life stage and health needs.
Questions, Suggestions, or Corrections?
If you spot an error or have feedback on this page, feel free to get in touch. We want this calculator and its explanations to stay accurate, practical, and genuinely useful for dog owners comparing foods.
Contact us here.