Lettuce is a staple in salads, wraps, and low-carb bowls, but calories can vary by variety, density, and how it's cut. This calculator estimates calories, carbohydrates, protein, and fiber for common lettuce types—iceberg, romaine, butterhead, green leaf, red leaf, and arugula. You can enter your serving as cups or grams, and choose whether your cup is loosely filled or packed down, so the estimate matches the way you actually serve it.
The calorie figures are based on standard USDA nutrition data for raw lettuce, which means the tool works for fresh leafy greens rather than cooked or dressed lettuce. If you're meal-prepping, tracking macros, or trying to build satisfying low-calorie meals, this quick calculator helps you see exactly how little—or how much—lettuce contributes to your daily intake.
🥬 Lettuce Calories Per Cup
Choose a variety and serving size, then press Calculate.
How It Works
This tool estimates calories and macros for raw lettuce using USDA FoodData Central nutrient values per 100 grams. It converts your serving size to grams using variety-specific average cup weights, then applies a simple proportion: (serving grams ÷ 100) × value per 100 grams.
The cup weights in the calculator are broad averages. A cup of shredded iceberg weighs much more than a cup of whole romaine leaves because larger leaves trap more air between them. This is why the same volume of different lettuces can show noticeably different calorie counts even though their per-100-gram values are similar. Arugula, with its delicate leaves, weighs only about 20 g per loose cup, while finely chopped iceberg can reach 72 g in the same cup.
Carbs, protein, and fiber are calculated the same way.
When you select “Packed / pressed down,” the calculator multiplies the loose cup weight by 1.35 to account for the extra leaves that fit into the same volume.
Reference Table
The table below shows the values built into the calculator. Per-100-gram nutrient values come from USDA FoodData Central for raw, fresh lettuce, and the cup weight is the average weight of one loosely filled US measuring cup.
| Variety | Calories / 100g | Carbs | Protein | Fiber | 1 cup loose |
|---|---|---|---|---|---|
| Iceberg | 14 | 2.97 g | 0.90 g | 1.20 g | 72 g |
| Romaine | 17 | 3.30 g | 1.20 g | 2.10 g | 47 g |
| Butterhead | 13 | 2.20 g | 1.35 g | 1.10 g | 55 g |
| Green leaf | 15 | 2.90 g | 1.40 g | 1.30 g | 40 g |
| Red leaf | 16 | 2.50 g | 1.30 g | 0.90 g | 40 g |
| Arugula | 25 | 3.65 g | 2.60 g | 1.60 g | 20 g |
These are average values from the USDA; individual heads can vary slightly depending on growing conditions, harvest time, and water content. Full database records are available at the USDA FoodData Central.
Worked Examples
Example 1 — Loose romaine in cups. You measure 2 cups of loosely packed romaine. Romaine’s average cup weight is 47 g, so your serving is 94 g. Since romaine provides 17 kcal per 100 g, the estimate is (94 ÷ 100) × 17 ≈ 16 kcal. The same serving also gives about 3.1 g of carbs, 1.1 g of protein, and 2.0 g of fiber.
Example 2 — Weighing in grams. Your meal-prep container holds 120 g of arugula. Arugula provides 25 kcal per 100 g, so the total is (120 ÷ 100) × 25 = 30 kcal. That is roughly 1.5% of a typical 2,000-calorie day — an enormous bowl of greens for very little energy.
Example 3 — Packed iceberg. A packed cup of iceberg uses the 72 g loose weight multiplied by 1.35, giving about 97 g. At 14 kcal per 100 g, that packed cup comes to about 14 kcal — barely more than a loose cup, even though it holds roughly a third more lettuce by weight.
Tips & Common Mistakes
Weighing in grams is the most reliable method because chopping size and packing change cup weight. If you measure by volume, stay consistent: use the same bowl, the same shred size, and the same level of packing every time. When a recipe says “1 cup chopped lettuce,” it usually means loosely filled.
Do not use nutrition labels from salad mixes that contain multiple greens or added ingredients, and do not estimate cooked or wilted greens with raw values — water loss concentrates calories per gram. The biggest tracking mistake is forgetting that dressings, croutons, cheese, and nuts add far more calories than the lettuce itself. A 2-tablespoon serving of ranch dressing can outweigh an entire bowl of greens in energy.
Frequently Asked Questions
Why do calorie counts for lettuce differ between sources?
Variety, growing conditions, water content, and measuring method all affect the numbers. USDA averages are a practical baseline for daily tracking, and the differences between sources are usually only a few calories per serving — rarely enough to change a meal plan.
Do darker greens have more calories?
Dark leafy greens often contain more nutrients, but the calorie difference is very small. Romaine, leaf lettuce, and arugula sit close to iceberg in energy while offering more vitamins, minerals, and antioxidants per serving.
Does cooking lettuce change the calories?
Cooking or wilting removes water, so the same weight of cooked greens has more calories per 100 g. If you are tracking the original serving, weigh the raw leaves before wilting or sautéing.
Should I count lettuce at all?
For strict macro tracking, yes — every gram counts. In practice, a cup of lettuce is usually 1–2% of your daily energy budget, so the main benefit of tracking it is building a habit of accuracy that carries over to higher-calorie foods.