Subway Tuna Sandwich Calories: Full Nutrition Breakdown

Last updated: May 2026

Subway Tuna Sandwich Calories: Full Nutrition Breakdown

A 6-inch Subway tuna sandwich contains approximately 370–480 calories depending on bread choice and how much mayo is used. The wide range exists because Subway’s tuna is canned tuna mixed with mayonnaise — and the mayo quantity significantly affects the total. Here’s the complete breakdown.

Subway Tuna Sandwich Nutrition Facts (6-Inch)

Why such a wide calorie range? The tuna protein itself (74g serving, before bread) is approximately 257 calories with 23.5g fat — almost all from the mayo used to prepare it. Small variations in how much tuna mixture is added, or whether extra mayo is applied, create meaningful calorie differences. The 370-calorie figure reflects lighter mayo application; the 480-calorie figure reflects a fuller standard portion.

Calories by Bread Choice

What’s Actually in Subway Tuna

Subway’s tuna is made from canned skipjack and yellowfin tuna blended with mayonnaise. It is not a fancy preparation, but it is legitimate fish with legitimate nutritional benefits:

• Complete protein: All nine essential amino acids
• Omega-3 fatty acids: ~250mg per 6-inch (primarily EPA and DHA from the tuna, not the mayo)
• Selenium: Supports thyroid function and antioxidant defense
• Vitamin B12: Critical for energy metabolism and red blood cell formation
• Iron: From fish heme iron, well-absorbed by the body

The fatty profile of the tuna sub differs from chicken-based subs primarily because of the mayo: the tuna protein itself is naturally low in fat, but the mayo-based preparation adds significant fat. Requesting “light mayo” or asking for the tuna portion to be made with less mayo is the single most effective way to reduce tuna sub calories.

Subway Tuna vs. Other Subs (6-Inch Comparison)

The tuna sub is notably higher in fat than lean protein options (turkey, chicken, roast beef) — but lower in sodium than most. If you’re managing sodium intake, the tuna sub is one of the better options at Subway. If fat is your primary concern, the lean protein options are significantly lower.

Subway Tuna Nutrition for Fitness Goals

Weight loss

At 370–480 calories with 15–20g protein, the 6-inch tuna sub fits into most weight loss calorie targets. The fat content (from mayo) is on the higher side compared to other 6-inch options. Requesting light mayo can bring the 6-inch closer to 350–400 calories. Avoid the footlong — it doubles to 740–960 calories.

Muscle gain

The tuna sub provides solid protein (15–20g), omega-3s that reduce exercise-induced inflammation, and 41–44g carbs for glycogen replenishment post-workout. For higher protein needs, pairing with a protein-rich side or requesting extra tuna (on a footlong) gets you to 35–40g protein.

General performance

Omega-3 fatty acids from tuna support cardiovascular health, reduce systemic inflammation, and may modestly support recovery from training stress. The selenium in tuna (55mcg, approximately 100% DV) supports thyroid function, which regulates metabolism. These are meaningful benefits for active people beyond just the protein content.

How to Order Subway Tuna to Hit Your Goals

• For lowest calories: Request light mayo, choose flatbread or 9-grain wheat, skip cheese, load vegetables — target: ~380–400 calories
• For highest protein: Request the tuna on a footlong, add extra protein scoops if available — target: 30–40g protein (at 740–960 calories)
• For lowest sodium: The tuna sub is already one of the lower-sodium Subway options (580mg standard) — skip cheese (saves 150–200mg) for a 430mg-range 6-inch
• As a salad: Tuna in a salad bowl (no bread) brings the entire meal to approximately 250–350 calories while retaining all the omega-3 and protein benefits

Frequently Asked Questions

How many calories in a Subway tuna footlong?

A Subway tuna footlong contains approximately 740–960 calories (double the 6-inch), with 30–40g protein, 82–88g carbs, and 32–50g fat depending on bread and mayo amount.

Is Subway tuna healthy?

The tuna itself — rich in omega-3s, selenium, and complete protein — is nutritious. The mayo-based preparation adds significant fat and calories. On balance, a 6-inch tuna sub with light mayo, 9-grain wheat, and lots of vegetables is a solid meal for most people. The full-mayo standard build is higher in fat than comparable chicken or turkey options.

Is Subway tuna real tuna?

Yes — Subway uses skipjack and yellowfin tuna mixed with mayonnaise. The FDA strictly regulates tuna labeling. Multiple independent tests have confirmed it contains fish; it is prepared tuna salad, not plain tuna fillet, which is why it has a higher fat content than you might expect from plain canned tuna.