Lettuce Calories & Nutrition Calculator

All four common lettuce varieties fall between 13 and 17 calories per 100g, making lettuce the lowest-calorie commonly consumed vegetable. The calorie difference between iceberg (14 kcal) and romaine (17 kcal) is nutritionally trivial — about 3 kcal per 100g ^[1].

The vitamin content gap, however, is enormous. Romaine lettuce contains 436mcg vitamin A (RAE) per 100g — 17x more than iceberg's 25mcg. Romaine also has 136mcg folate vs. iceberg's 29mcg (4.7x more) and 0.97mg iron vs. iceberg's 0.41mg (2.4x more). Green leaf lettuce falls between the two, with 370mcg vitamin A ^[1].

For food journaling, switching from iceberg to romaine adds negligible calories but dramatically increases vitamin A and folate tracking totals. If you're logging lettuce mainly for volume and fiber in salads, the variety choice barely affects your calorie math — but it significantly affects micronutrient tracking.

Iceberg lettuce is 95.6% water by weight, making it one of the most water-dense foods in the USDA database. Romaine is 94.6%, green leaf is 95%, and butterhead is 95.6%. This extreme water content is why 100g of any lettuce type delivers only 13–17 kcal ^[1].

For calorie tracking, this means lettuce adds volume to meals with minimal caloric impact. A large bowl of salad (200g lettuce) contains just 28–34 kcal before any dressing is added. The dressing, croutons, cheese, and protein toppings typically contribute 90–95% of a salad's total calories.

This high water content also makes weight-based tracking important. A 'cup' of shredded iceberg (72g) weighs almost twice as much as a 'cup' of shredded romaine (47g) because iceberg is denser when shredded. Log by weight rather than by cups for consistency across varieties.

A medium head of iceberg lettuce weighs approximately 539g and contains about 75 calories total — 14 kcal per 100g multiplied by 5.39 servings. Even with generous shredding, an entire head barely reaches the calorie content of a single tablespoon of olive oil dressing (119 kcal) ^[1].

This is why many calorie-tracking approaches treat plain lettuce as calorically negligible. However, for precise journaling, the calories are real and additive: a daily large salad using half a head of iceberg (270g, ~38 kcal) adds approximately 265 kcal per week — equivalent to a small meal over time.

The practical implication: log your lettuce, but don't stress over precision. A 50g measurement error on lettuce translates to only 7 kcal of inaccuracy — far less impactful than a 5ml measurement error on dressing (40 kcal). Focus your tracking precision on the dressings, nuts, and proteins in your salad.

Among the four lettuce types, romaine has the highest folate content at 136mcg per 100g — providing 34% of the daily value. Butterhead follows at 73mcg, green leaf at 38mcg, and iceberg at just 29mcg. The 4.7x gap between romaine and iceberg makes romaine the clear choice if folate intake matters for your tracking ^[1].

For context, raw spinach has 194mcg folate per 100g — higher than romaine. However, spinach is rarely consumed in the same volume as lettuce. A large romaine salad (150g) provides 204mcg folate, while 150g of raw spinach (a very large bowl) provides 291mcg. Both are substantial contributions to the 400mcg daily value.

One cup of shredded romaine (47g) delivers about 64mcg folate — 16% of the daily value from a single serving. For food journaling, romaine salads provide a meaningful and easily trackable folate contribution that iceberg salads cannot match.

One large outer romaine leaf (~28g) contains approximately 5 kcal. A standard flour tortilla (45g) contains approximately 120 kcal. Swapping a tortilla for a lettuce wrap saves about 115 kcal per wrap — across 2 wraps per meal, that's a 230 kcal reduction ^[2].

The calorie math is straightforward, but the trade-offs are worth noting: the tortilla provides 20g carbs, 3g protein, and structural integrity, while the lettuce leaf provides 0.5g carbs, 0.3g protein, and tends to tear. For food journaling, the swap almost entirely removes the carbohydrate contribution of the wrap component.

Iceberg lettuce cups (commonly used in Asian lettuce wraps) weigh about 8–15g per cup and contain 1–2 kcal each. A meal of 3 lettuce cups with chicken filling uses about 30g of lettuce (4 kcal) vs. 3 tortillas (360 kcal). The filling's calorie tracking matters; the lettuce cup is calorically invisible.