Amino Acid Protein Calculator
Enter foods to make sure you are getting all the essential amino acids.
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Romaine Lettuce
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Iceberg Lettuce
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Number of Servings:
Note: Nutrient values are divided into 1 servings.
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  • Calories 18 1% DV
  • Protein 1.2g 2% DV
  • Carbs 3.7g 1% DV
  • Fat 0.2g 0% DV
  • Fiber 1.9g 7% DV
  • Sugar 2g 4% DV
  • Amino Acid Score 3%
  • Lysine / Arginine 1.31
Amino Acid Bar Charts

Total Recommended Daily Intake

  • Cystine 2% RDI 6mg
  • Histidine 2% RDI 16mg
  • Isoleucine 2% RDI 34mg
  • Leucine 2% RDI 54mg
  • Lysine 2% RDI 47mg
  • Methionine 1% RDI 11mg
  • Phenylalanine 5% RDI 47mg
  • Threonine 4% RDI 38mg
  • Tryptophan 4% RDI 11mg
  • Tyrosine 2% RDI 17mg
  • Valine 2% RDI 43mg
Protein Comparison Table

Table Legend

  1. Romaine Lettuce
  2. Iceberg Lettuce
-- = missing data
Amino Acids
Food # 1 2 Total
Weight (g) 47 72 119
Essential  
Histidine (mg)
(%RDI)		 10
(1%)		 6
(1%)		 16
(2%)
Isoleucine (mg)
(%RDI)		 21
(2%)		 13
(1%)		 34
(2%)
Leucine (mg)
(%RDI)		 36
(1%)		 18
(1%)		 54
(2%)
Lysine (mg)
(%RDI)		 30
(1%)		 17
(1%)		 47
(2%)
Methionine (mg)
(%RDI)		 7
(1%)		 4
(0%)		 11
(1%)
Phenylalanine (mg)
(%RDI)		 31
(3%)		 17
(2%)		 47
(5%)
Threonine (mg)
(%RDI)		 20
(2%)		 18
(2%)		 38
(4%)
Tryptophan (mg)
(%RDI)		 5
(2%)		 6
(2%)		 11
(4%)
Valine (mg)
(%RDI)		 26
(1%)		 17
(1%)		 43
(2%)
Conditional  
Arginine (mg) 25
11
36
Cystine (mg)
(%RDI)		 3
(1%)		 4
(1%)		 6
(2%)
Glycine (mg) 23
11
34
Proline (mg) 21
7
28
Tyrosine (mg)
(%RDI)		 12
(1%)		 5
(1%)		 17
(2%)
Non-Essential  
Alanine (mg) 26
18
44
Aspartic acid (mg) 65
90
155
Betaine (mg) 0
0
0
Glutamic acid (mg) 84
140
223
Hydroxyproline (mg) --
--
0
Serine (mg) 24
18
42
Lysine to Arginine Ratio of All Selected Foods: 1.31
Data Source
Romaine Lettuce
USDA Food Data Central Standard Release (Common)Omega-6 data was extrapolated from undifferentiated-Octadecadienoic Acid (18:2) acid.
Iceberg Lettuce
USDA Food Data Central Standard Release (Common)Omega-6 data was extrapolated from undifferentiated-Octadecadienoic Acid (18:2) acid.Iodine data is obtained from the USDA Iodine database.