How much does a head of lettuce weigh depends on the type. A grocery-store head usually runs 1 to 1.5 pounds. But dense iceberg can top 2 pounds, while a soft butterhead barely hits half a pound.

A head of lettuce usually weighs 1 to 1.5 pounds (about 16 to 24 ounces, or 450 to 680 grams). Iceberg is the heaviest at over a pound, while butter and Bibb heads weigh just 4 to 8 ounces.

How Much Does a Head of Lettuce Weigh on Average?

An average head of lettuce weighs about 1 to 1.5 pounds. That works out to roughly 16 to 24 ounces, or 450 to 680 grams. The exact number depends on the type, because a “head” is a shape, not a fixed unit of weight.

Dense iceberg packs the most mass into a tight ball, so it can top 2 pounds. A soft butterhead head is loose and airy, so it barely reaches half a pound. Romaine and leaf lettuce sit in the middle.

Lettuce (Lactuca sativa) is also about 95 percent water. So a fresh-cut head weighs more than the same head after a few days in the fridge. The leaves dry out and shed water weight.

How Much Does Each Type of Lettuce Weigh?

Iceberg heads weigh the most, and butterhead heads weigh the least. Romaine and leaf types fall in between. Here are the typical weights you will see at the store or coming out of the garden.

These ranges line up with USDA FoodData Central reference figures. For example, USDA lists a medium iceberg head at 539 grams and a romaine head at 626 grams. A green leaf head comes in at 360 grams, and a butterhead at 163 grams. Field and retail heads vary around those numbers based on variety and trimming.

How Much Does a Head of Iceberg Lettuce Weigh?

A head of iceberg lettuce weighs about 1 to 1.75 pounds. Most grocery heads land near 1.2 pounds, which is about 19 ounces or 539 grams. A large, well-filled head can reach 1.66 pounds (755 grams). A small one runs closer to 11 ounces (324 grams).

Iceberg is a crisphead type, so the leaves wrap tight and hold a lot of weight in a compact ball. That density is why a fairly small iceberg can still feel heavy in your hand. Most U.S. iceberg comes out of California’s Salinas Valley, where growers size the heads to pack about 24 to a carton.

If you grow your own, weight tracks closely with firmness. I check iceberg at the right harvest firmness by giving the head a gentle squeeze. A firm, full head has hit its weight. A loose one still has filling out to do.

How Much Does a Head of Romaine Lettuce Weigh?

A full head of romaine weighs about 1 to 1.5 pounds, or 16 to 24 ounces (450 to 680 grams). USDA’s reference head of cos (romaine) comes in at 626 grams, which is right at 1.38 pounds. Romaine stands tall, so much of that weight sits in the thick midribs and the tight core.

Romaine hearts weigh a lot less. Those are the trimmed inner leaves with the outer wrappers stripped off. A single heart usually runs 5 to 8 ounces, and stores often sell them in three-packs. So a bag of three hearts can weigh about the same as one full head.

Growing romaine for full-size heads takes steady moisture and cool weather. I walk through that in my guide on growing romaine without it bolting.

How Much Do Butter, Bibb, and Leaf Lettuce Heads Weigh?

Butterhead types (Boston and Bibb) weigh just 4 to 8 ounces per head. Loose green or red leaf heads run a bit heavier, about 8 to 13 ounces. USDA lists a butterhead head at 163 grams (5.75 ounces) and a green leaf head at 360 grams (12.7 ounces).

These types form loose, open heads with air between the leaves. So they look generous but weigh light. Living-lettuce clamshells, the kind sold with roots attached, often hold a butterhead head near 5 ounces. For tender heads at home, my notes on growing sweet Bibb heads cover spacing and timing.

How Many Cups of Lettuce Are in One Head?

One medium head gives roughly 6 to 8 cups of chopped or shredded leaves. The exact yield depends on the type and how tightly you pack the cup. Here is how the common types measure up by the cup.

Shredded iceberg weighs about 72 grams per cup. Shredded romaine sits near 47 grams per cup. Green leaf comes in around 36 grams per cup, and chopped butterhead runs about 55 grams per cup.

So a medium iceberg head (539 grams) gives roughly 7 to 8 cups shredded, which is about 6 servings. A romaine head yields a big pile of leaves because the shreds are light and fluffy. A small butterhead, by contrast, fills only 3 cups or so.

What Affects How Much a Head of Lettuce Weighs?

Type, maturity, water content, trimming, and growing conditions all change how much a head of lettuce weighs. Each one can swing the number on the scale.

Maturity matters most for heading types. A young head that has not filled out weighs far less than a mature, firm one. So harvest timing sets the final weight.

Water content is the next big factor. Lettuce is 95 to 96 percent water, so heads lose weight fast as they dehydrate. Keeping them cold and covered slows that loss. I explain how to keep cut lettuce crisp in storage so heads hold their weight and texture.

Trimming knocks off weight too. Once you peel the wilted wrapper leaves and cut the base, plan on 5 to 10 percent loss on iceberg and romaine. Romaine hearts show this clearly, since the trimmed inner leaves weigh much less than the whole head.

Growing conditions shape head size before harvest. Tight plant spacing makes smaller heads, while proper spacing in rows and beds lets each head bulk up. Steady water and enough nitrogen build size as well.

Heat works against you. When temperatures climb, lettuce bolts and stops filling the head, which cuts marketable weight. That is why I focus on keeping summer lettuce from bolting during the hot stretch here in Kansas.

How I Use These Weights on My Farm and in the Kitchen

When I plan a salad crop or shop for a recipe, I think in pounds first. One head of iceberg or romaine covers a family salad with leftovers. Two heads of butter lettuce barely match one iceberg by weight. A kitchen scale settles any guesswork. A quick rule gets me close every time: a medium iceberg near 1.2 pounds, a romaine near 1.4 pounds. Buy by the head for crisp structure, and trim only what you need so you keep the weight you paid for.