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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Butterhead 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 25 1% DV
  • Protein 2g 4% DV
  • Carbs 4.9g 2% DV
  • Fat 0.4g 0% DV
  • Fiber 2.5g 9% DV
  • Sugar 2.5g 5% DV
  • Amino Acid Score 4%
  • Lysine / Arginine 1.22
Amino Acid Bar Charts

Total Recommended Daily Intake

  • Cystine 4% RDI 11mg
  • Histidine 4% RDI 26mg
  • Isoleucine 4% RDI 56mg
  • Leucine 3% RDI 93mg
  • Lysine 4% RDI 78mg
  • Methionine 3% RDI 18mg
  • Phenylalanine 9% RDI 76mg
  • Threonine 6% RDI 61mg
  • Tryptophan 7% RDI 18mg
  • Tyrosine 3% RDI 27mg
  • Valine 4% RDI 73mg
Protein Comparison Table

Table Legend

  1. Romaine Lettuce
  2. Butterhead Lettuce
  3. Iceberg Lettuce
-- = missing data
Amino Acids
Food # 1 2 3 Total
Weight (g) 47 55 72 174
Essential  
Histidine (mg)
(%RDI)
10
(1%)
9
(1%)
6
(1%)
26
(4%)
Isoleucine (mg)
(%RDI)
21
(2%)
21
(2%)
13
(1%)
56
(4%)
Leucine (mg)
(%RDI)
36
(1%)
39
(1%)
18
(1%)
93
(3%)
Lysine (mg)
(%RDI)
30
(1%)
31
(1%)
17
(1%)
78
(4%)
Methionine (mg)
(%RDI)
7
(1%)
8
(1%)
4
(0%)
18
(3%)
Phenylalanine (mg)
(%RDI)
31
(3%)
29
(3%)
17
(2%)
76
(9%)
Threonine (mg)
(%RDI)
20
(2%)
23
(2%)
18
(2%)
61
(6%)
Tryptophan (mg)
(%RDI)
5
(2%)
7
(3%)
6
(2%)
18
(7%)
Valine (mg)
(%RDI)
26
(1%)
30
(2%)
17
(1%)
73
(4%)
Conditional  
Arginine (mg) 25
28
11
64
Cystine (mg)
(%RDI)
3
(1%)
5
(2%)
4
(1%)
11
(4%)
Glycine (mg) 23
24
11
58
Proline (mg) 21
20
7
49
Tyrosine (mg)
(%RDI)
12
(1%)
10
(1%)
5
(1%)
27
(3%)
Non-Essential  
Alanine (mg) 26
30
18
74
Aspartic acid (mg) 65
78
90
233
Betaine (mg) 0
0
0
0
Glutamic acid (mg) 84
113
140
337
Hydroxyproline (mg) --
--
--
0
Serine (mg) 24
25
18
67
Lysine to Arginine Ratio of All Selected Foods: 1.22
Data Source
Romaine Lettuce
USDA Food Data Central Standard Release (Common)Omega-6 data was extrapolated from undifferentiated-Octadecadienoic Acid (18:2) acid.
Butterhead 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.