Roma tomato calories sound like they should be their own category. They are not. A roma is a shape and a use case, not a separate nutrient profile.
The calorie count comes almost entirely from how much the fruit weighs. That single fact clears up most of the confusion behind this search.
Once weight is accounted for, a roma tracks a regular slicing tomato closely, gram for gram. This guide breaks down what “roma” really describes. It also covers what that means for roma tomato calories per fruit, per cup, and in sauce.
What “roma” really means
Roma and plum tomatoes share an oblong shape and a dense, meaty interior. They carry far fewer seeds than a round slicing tomato of the same weight.
They also hold less watery gel inside each fruit. That structure is why romas dominate canning and sauce making.
Less water inside means less time spent cooking a sauce down. A university extension guide to tomato types describes roma fruit as medium sized and oblong. It notes the flesh is especially meaty compared to slicing varieties.
Nothing about that shape changes the calorie math per gram. A dense interior just means more fruit tissue and less liquid packed inside the same skin.
How much a roma tomato actually weighs
This is the part that really drives roma tomato calories, and it varies more than most people expect. A typical grocery store roma runs about 2 to 3 ounces.
That works out to roughly 60 to 85 grams per fruit. Some paste type heirloom romas run much larger than that.
A classic Italian roma variety sold through seed catalogs is described as producing fruit that averages 6 ounces. That is close to 170 grams, nearly three times the weight of a small grocery roma.
Size on the vine depends on the specific variety and the growing conditions. It also depends on how heavily a plant was thinned during the season.
The USDA does not publish a separate size category for roma tomatoes either. Its official grading standard for fresh tomatoes defines small, medium, large, and extra large by diameter alone.
Romas get sorted into whichever diameter class they happen to fit. There is no roma specific line in that standard, and no roma specific calorie category either.
Calories in one roma tomato, by size
Raw tomato runs close to 18 calories per 100 grams across nutrient composition data. That holds whether the fruit is round or oblong.
Scaling that figure to actual weight gives the real roma tomato calories number for any given fruit. A small 60 gram roma comes out to about 11 calories.
An 85 gram roma lands closer to 15 calories. A large 170 gram paste roma, the size of that Italian heirloom variety, runs about 31 calories.
None of that spread comes from the roma shape itself. It comes entirely from the extra grams sitting on the scale.
Two small romas and one large one can land at nearly the same calorie total. That depends entirely on the exact fruit picked, not on the variety name printed on the seed packet.
That is the core answer to roma tomato calories in one sentence. Weigh the fruit, not the variety, and the number falls into place.
Calories per cup of chopped roma
A cup of raw, chopped tomato works out to roughly 32 calories. That figure comes from nutrient composition data cited in a peer reviewed dietary intake study.
That number applies to tomatoes generally, romas included. A cup measure is defined by volume rather than variety.
A cup of chopped roma usually takes two to three fruits. That estimate depends on their smaller average size compared to a beefsteak.
Dicing several small romas into one measuring cup packs in a bit more flesh than cutting a single large round tomato the same way. There is less air between the pieces.
That small packing difference is not large enough to matter for everyday tracking. Treating a cup of chopped roma the same as a cup of any other raw tomato is close enough for practical use.
Do calories change when romas go into sauce
Cooking romas down into sauce does not add or remove calories from the tomato itself. Water evaporates as the sauce reduces.
The same calorie total ends up packed into less volume once that water is gone. A half cup of finished sauce can carry the calories that started as a full cup or more of chopped raw fruit.
That concentration effect explains why cooked tomato products read higher on a label than fresh ones do. The comparison is cup for cup, and the tomato itself has not actually changed.
The calories almost never come from the roma itself once oil, salt, or sugar enter the recipe. Those additions, not the tomato, usually explain a finished sauce label that reads higher than expected.
Skin, seeds, and net weight
Some cooks peel and seed romas before making sauce. The thick skin and few seeds are easy to remove.
That trimming lowers the total weight of what gets cooked down. Lower weight means a slightly lower calorie count for that batch, following the same weight based math as any other tomato.
The difference is small, usually just a few calories across an entire pot of sauce. It is not worth tracking separately for most home cooks.
The trimmed skin and seeds carry very little of the fruit’s total weight to begin with. Most of a roma’s weight is the dense flesh, not the parts most cooks discard.
Roma versus other common tomato types
A small cherry tomato runs close to 3 calories each, simply because it weighs so little. A large beefsteak can top 30 or 40 calories for the same reason, just from sheer size.
A roma sits in between those two extremes most of the time. It runs a little heavier than a cherry but usually lighter than a full sized beefsteak.
The pattern holds across every tomato type on a produce shelf. Bigger fruit means more calories, and variety name explains almost none of the difference on its own.
Grape tomatoes land close to cherry tomatoes on a per fruit basis, since the two are similar in average weight. Green, unripe tomatoes weigh about the same as their ripe counterparts too, so their calorie count barely moves as they redden.
Heirloom varieties bred for enormous fruit are the real outliers on this list. A single slice from a one pound heirloom can carry more calories than three or four whole romas combined.
Why roma calories barely matter for weight tracking
Even a generous three roma tomato serving lands under 50 calories. That puts roma tomatoes solidly in the low calorie vegetable range most eating plans do not restrict at all.
The bigger nutrition story with roma tomatoes is rarely calories. It is usually about what else the fruit brings along.
The potassium content tomatoes are known for is a more useful number for most people to track than a calorie count this small. Anyone counting carbs instead of calories has a related question worth answering too.
Whether tomatoes fit a low carb or keto pattern depends more on portion size than on roma versus round. A whole roma or two rarely changes that answer either way.
A quick way to estimate roma tomato calories at home
A kitchen scale settles the question faster than any chart can. Weigh a roma in grams, multiply by 0.18, and the result is a close estimate of its calories.
Without a scale, counting by size works almost as well. Small romas run about 11 calories each.
Medium ones land near 15, and the largest paste types can reach 30 or more. For recipes that call for a specific cup measurement, a tomato conversion calculator converts between whole fruit, cups, and pounds without the manual math.
That tool saves the guesswork on how many romas will fill a given measure. It beats eyeballing a pile of chopped tomato and hoping for the best.
A kitchen scale costs little and removes almost all the uncertainty in this kind of estimate. Once a gardener or cook weighs a handful of romas from their own kitchen once, the pattern for that batch becomes easy to eyeball afterward.
Roma calories in context of the whole diet
A roma tomato’s calorie count is tiny next to almost anything else on a plate. Even a stack of five small romas barely reaches the calories in a single slice of bread.
That makes portion tracking for roma tomatoes mostly unnecessary on its own. The math only starts to matter once oil, cheese, or bread enters the picture alongside the tomato.
Checking the full nutrition breakdown for tomatoes puts the calorie figure next to protein, carbs, and vitamin content. A broader look at tomato nutrition and health covers what those other numbers really mean for a typical diet.
Frequently asked questions
How many calories are in one roma tomato?
A typical grocery store roma weighing 60 to 85 grams runs about 11 to 15 calories. A larger paste type roma near 170 grams runs closer to 31 calories. Weight, not variety, sets the number.
Are roma tomatoes lower in calories than regular tomatoes?
Not by weight. Roma tomatoes have about the same calories per gram as round slicing tomatoes. Any difference in total calories comes from fruit size, not variety.
How many calories are in a cup of chopped roma tomatoes?
About 32 calories, the same figure that applies to a cup of chopped tomato generally. It usually takes two to three romas to fill a cup, depending on their size.
Do roma tomatoes have more calories once cooked into sauce?
The tomato itself does not gain calories from cooking. Water evaporates as sauce reduces, so the same calorie total ends up concentrated in a smaller serving size.
Are roma tomato calories worth tracking on a diet?
Rarely, since even a generous serving lands under 50 calories. Added oil, salt, or sugar in a recipe usually matters far more than the tomato itself.