Lettuce vs Onion: All Nutritional Differences

Where is more calories, protein, carbs - what is more healthy?

Lettuce - calories, kcal, weight, nutrition
Onion - calories, kcal, weight, nutrition

Fact 1: There is Less Calories in Lettuce

At first glance, you can see that in lettuce is much less calories than in onion.

Lettuce has 15 kcal per 100g and onion 40 kcal per 100g so it is pretty easy to calculate that the difference is about 167%.

In lettuce and in onion most calories came from carbs.

See tables below to compare lettuce with onion in details.

Fact 2: Lettuce And Onion Nutrition Difference

Onion vs Lettuce: Vitamins and Minerals Comparison

per 100gLettuceOnion
Calories15 40
Carbohydrates2.87 g9.34 g
Fat0.15 g0.1 g
Dietary fiber1.3 g1.7 g
Protein1.36 g1.1 g
Calcium36 mg23 mg
Magnessium13 mg10 mg
Phosphorus29 mg29 mg
Potassium194 mg146 mg
Sodium28 mg4 mg
Zink0.18 mg0.17 mg
Vitaminium B1 (Thiamine)0.07 mg0.046 mg
Vitaminium B2 (riboflavin)0.08 mg0.027 mg
Vitaminium B3 (Niacin)0.375 mg0.116 mg
Vitaminium B50.134 mg0.123 mg
Vitaminium B60.09 mg0.12 mg
Vitaminium B9 (Folic acid)38 mg19 mg
Vitaminium C9.2 mg7.4 mg
Vitaminium E0.29 mg0.02 mg
Beta karoten4443 mg1 mg

More protein in lettuce

It is aslo easy to see see that in lettuce is more protein than in onion.

There is 1.1g per 100g of onion and 1.36g per 100g of lettuce so using simple math we can see that difference is about 24%.

Less carbohydrates in lettuce

In lettuce is less carbohydrates than in onion.

There is 9.34g/100g of carbohydrates in onion and 2.87g/100g in lettuce so let me do the math for you again - difference is about 225%.

More fat in lettuce

In lettuce is more fats than in onion.

The tables above show us that there is 0.1g/100g of fats in onion and 0.15g/100g in lettuce. In this case difference is about 50%.


  • Calories15
  • Carbohydrates2.87 g
  • Fat0.15 g
  • Dietary fiber1.3 g
  • Protein1.36 g
Lettuce calories per:
100g | ounce | single piece | cup | chopped | 1 large leaf

Calories source

  • 63% CARBS.
  • 30% PROTEIN
  • 7% FAT


  • Calories40
  • Carbohydrates9.34 g
  • Fat0.1 g
  • Dietary fiber1.7 g
  • Protein1.1 g
Onion calories per:
100g | ounce | single piece | slice | cup | sliced

Calories source

  • 88% CARBS
  • 10% PROTEIN
  • 2% FAT

Vitamins: onion vs lettuce

Minerals: lettuce vs onion

Marcin Piotrowicz
Author of this page
Marcin Piotrowicz

calories-info.com creator
Healthy diet and healthy lifestyle promoter

All information about nutrition on this website was created with help of information from the official United States Department of Agriculture database.

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