Tomatoes are 18 calories per 100g — one of the lightest options in any salad. A whole tomato is around 22 calories. Cooked tomato sauce gets denser per gram, and added oil/sugar in jarred sauces is where the calorie count climbs quickly.
Calories scale with portion. Here's how a typical tomato serving translates in your tracker:
Very low calorie — at 18 kcal per 100g, tomato adds volume to a meal without meaningfully denting a calorie deficit.
How tomato stacks up on calories and protein against foods people commonly compare it to:
Point your iPhone camera at tomato and Spotwell's on-device AI estimates the portion and macros in under a second — no manual entry, no barcode hunting.
Download on theApp StoreTomato has approximately 18 calories per 100g. A typical serving — 1 medium (123g) — comes in at 22 calories.
0.9g of protein per 100g. That puts tomato at roughly 5.0g of protein per 100 calories — a useful lens when comparing to other vegetables sources.
The simplest method: weigh it on a kitchen scale, then enter grams in your tracker. With Spotwell, you can skip the scale — point the camera at the plate and the AI estimates the portion in under a second. Adjust the value if it looks off.
It depends on your overall calorie target. Tomato is naturally low-calorie at 18 kcal per 100g, so it's easy to fit into a deficit.