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Best Answer: a normal head of lettuce can weigh between 10oz, and 1 1/2 lbs. I should know I am addicted to lettuce. I eat it every single day. If you put three largish leaves, in your sandwhich the calorie content is small. A 1lb head of lettuce will have around 60 calories. So each leaf is around 5 calories. That is a normal sliced loaf size of bread. If it's a foot long, say at Subway, type thing, you have more lettuce- about five or sixe leaves, but they will be smaller leaves, so at most 30 calories.
Almost any kind of leaf lettuce will grow quickly in a hydroponic system. Some of the types to try include Romaine, bibb and butter crunch, all of which are ready in three to four weeks. Head lettuce, such as iceberg, will grow well, but the heads take about twice as long to be ready as the leafy types. When growing leaf lettuce, harvest just the outer leaves of the plants and leave the inner leaves to grow, to give you a crop you can harvest almost every day.