Although tomatoes are not low in carbs, they are also not very high. You will find that overall tomatoes are actually a very healthy vegetable to eat because they contain many of the vitamins and minerals which are essential for the body to function properly.
There is only single carb in a cherry tomato, 3.5 carbs in one small tomato, 5 carbs in a medium-sized tomato, and 6 carbs in a large tomato. This means that even if you are on a strict diet, you will not have to worry about needing to limit or completely cut out your consumption of tomatoes.