This depends how much tuna/sweetcorn you put in the sandwich and what bread you use (and how much bread there is).
If the tuna was stored in oil, then 150 calories. If the tuna was stored in water, the 100 calories.
120 calories
There are about 50 Calories in 2oz of light tuna in water.
390 calories
The average 4-oz. serving of raw tuna contains 122 calories.
A 4 oz. can of light tuna in oil is about 210 calories or 53 calories per oz. Other tuna in oils are approximately 56 calories per ounce.
245 calories.
There are about 476 calories in a rainbow roll.
559
There are about 84 calories in a small dinner roll.
636 calories per person