How many calories in lettuce, no dressing?

Lettuce is very low in calories, with most varieties containing about 5 to 15 calories per cup when raw and chopped. For example, a cup of romaine lettuce has approximately 15 calories, while a cup of iceberg lettuce has around 10 calories. Because it is primarily composed of water, lettuce is often included in salads and dishes for its crunch and volume without adding significant calories.