How to Use This Calculator
- 1
Enter Animal Protein (g)
Input the total grams of protein consumed from animal sources (meat, dairy, eggs), typically having a PDCAAS of 1.0. For example, 60g.
- 2
Enter Plant Protein (g)
Input the total grams of protein consumed from plant sources (legumes, grains, nuts), which average a PDCAAS of around 0.70. For example, 40g.
- 3
Review Your Completeness Score
The calculator will display your overall protein completeness score, a quality label, the share of animal vs. plant protein, estimated leucine content, and potential complementing boost.
Example Calculation
An individual consuming 60g of animal protein and 40g of plant protein wants to assess their overall protein completeness and quality.
Animal Protein (g)
60
Plant Protein (g)
40
Results
92.0/100
Tips
Prioritize Leucine for Muscle Protein Synthesis
Aim for at least 2.5-3g of leucine per meal to optimally stimulate muscle protein synthesis (MPS). Animal proteins are naturally rich in leucine, but plant-based eaters can achieve this by combining sources like legumes and grains or supplementing with BCAAs.
Strategic Plant Protein Pairing
To improve the completeness score of plant-based meals, strategically pair complementary proteins. For example, combine grains (like rice) with legumes (like beans) to ensure all essential amino acids are present in sufficient quantities, boosting the effective PDCAAS from ~0.70 to ~0.90.
Consider Total Protein Intake Alongside Completeness
While completeness is important, ensure your total protein intake meets your daily needs (e.g., 1.6-2.2 g/kg body weight for active individuals). Even a complete protein source won't be sufficient if the overall quantity is too low to support muscle repair and growth.
Assessing Your Protein Completeness Score
The Protein Completeness Score Calculator helps you evaluate the nutritional quality of your protein intake by considering the mix of animal and plant sources.
This is crucial for optimizing muscle protein synthesis, recovery, and overall health.
While animal proteins like whey and eggs boast a perfect PDCAAS of 1.0, many plant proteins average around 0.70, highlighting the importance of dietary balance for meeting all essential amino acid needs, especially for active individuals targeting 1.6-2.2 grams of protein per kilogram of body weight in 2025.
Why Protein Quality Matters for Health
Protein quality, often measured by its completeness, is paramount for optimal health because it directly impacts the body's ability to repair tissues, build muscle, and synthesize enzymes and hormones.
Inadequate intake of even one essential amino acid (EAA) can limit the entire process of protein synthesis, regardless of total protein quantity.
This is particularly relevant for athletes and older adults, where achieving a sufficient supply of EAAs, especially leucine, is critical for maintaining muscle mass and strength.
Prioritizing complete proteins or strategically combining incomplete ones ensures that the body has all the necessary building blocks to function at its best.
Calculating Your Weighted Protein Completeness
This calculator determines your protein completeness score by weighting your animal and plant protein intake based on their typical PDCAAS (Protein Digestibility Corrected Amino Acid Score) values.
Animal proteins are assigned a PDCAAS of 1.0, while plant proteins are averaged at 0.70 for this calculation.
The core formula used is:
Total Protein = Animal Protein (g) + Plant Protein (g)
Weighted Protein Score = (Animal Protein (g) × 1.0) + (Plant Protein (g) × 0.70)
Completeness Score = (Weighted Protein Score / Total Protein) × 100
This score, expressed out of 100, provides an overall assessment of how well your protein intake covers all essential amino acids.
The higher the score, the more "complete" your protein profile is considered.
Assessing Protein Completeness from 100g Intake
Let's evaluate the protein completeness for an individual consuming 60 grams of animal protein and 40 grams of plant protein, totaling 100 grams of protein.
- Calculate Total Protein Intake: 60g (Animal Protein) + 40g (Plant Protein) = 100g
- Calculate Weighted Protein Score: (60g × 1.0 (Animal PDCAAS)) + (40g × 0.70 (Plant PDCAAS)) = 60 + 28 = 88
- Determine Completeness Score: (88 / 100g (Total Protein)) × 100 = 88.0/100
The completeness score for this intake is 88.0/100, indicating a "Near Complete" profile.
While good, there are minor amino acid gaps, suggesting that strategic pairing of plant proteins or a slight increase in complete protein sources could further optimize the amino acid profile.
Protein Completeness Benchmarks and Goals
For optimal health and muscle protein synthesis, a protein completeness score of 95/100 or higher is considered excellent, indicating robust coverage of all essential amino acids.
Scores between 85-95/100 are "Near Complete," suggesting a good profile but with minor potential gaps that can be addressed by diversifying sources or strategic pairing.
Below 85/100, the protein profile is "Mixed" or "Incomplete," highlighting a need to either increase the proportion of complete animal proteins or meticulously combine plant sources (e.g., rice and beans) to achieve a more balanced amino acid profile.
Active individuals often aim for a higher score to maximize recovery and growth, while general health guidelines may tolerate slightly lower scores if total protein intake is sufficient.
Formula Variants for Protein Quality Assessment
While PDCAAS (Protein Digestibility Corrected Amino Acid Score) is widely used, there are alternative methods for assessing protein quality, each with its own nuances and applications.
DIAAS (Digestible Indispensable Amino Acid Score): The DIAAS, endorsed by the FAO, is considered a more accurate and advanced method than PDCAAS.
It measures the digestibility of individual indispensable (essential) amino acids at the end of the small intestine, rather than crude protein digestibility at the fecal level.
DIAAS = 100 × (mg of digestible dietary indispensable amino acid in 1g of the dietary protein / mg of the same dietary indispensable amino acid in 1g of the reference protein)DIAAS values can exceed 100, unlike PDCAAS, and are typically used for precise nutritional labeling and research.
PER (Protein Efficiency Ratio): An older method, PER measures the weight gain of a test subject (usually a rat) per gram of protein consumed.
PER = Weight Gain (g) / Protein Consumed (g)While simple, PER doesn't directly assess amino acid balance and has largely been replaced by PDCAAS and DIAAS for human nutrition due to its reliance on animal models.
This calculator primarily uses a PDCAAS-based weighting for its simplicity and widespread understanding, but recognizing these variants highlights the evolving science of protein quality assessment.
Frequently Asked Questions
What is protein completeness?
Protein completeness refers to whether a protein source provides all nine essential amino acids (EAAs) in adequate proportions for human bodily functions. Animal proteins are typically complete, while many plant proteins are incomplete, meaning they lack sufficient amounts of one or more EAAs.
What are essential amino acids (EAAs)?
Essential amino acids (EAAs) are nine specific amino acids that the human body cannot synthesize on its own and must be obtained through diet. They include histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine, all critical for protein synthesis and various metabolic processes.
What is PDCAAS and how does it relate to protein quality?
PDCAAS (Protein Digestibility Corrected Amino Acid Score) is a method used to evaluate protein quality based on both the amino acid requirements of humans and their ability to digest it. A score of 1.0 (the highest possible) indicates a complete protein that is well-digested, such as eggs or whey, while lower scores denote less complete or digestible proteins.
How can plant-based diets ensure protein completeness?
Plant-based diets can ensure protein completeness by consuming a variety of plant protein sources throughout the day, strategically combining complementary proteins. For example, pairing legumes (rich in lysine) with grains (rich in methionine) provides all essential amino acids, similar to consuming a complete protein from animal sources.