If you’re asking how much protein is in 100 gm tuna fish, the short answer is: usually about 24 to 29 grams, depending on the type of tuna and whether it’s raw, canned, drained, or packed in oil.
The easiest way to get an accurate number is to identify the tuna form, check a trusted database or label, and weigh the actual edible portion. That matters because a “100 g” serving of tuna is not always the same as 100 g from the can, the package, or the cooked plate.
1) Identify the tuna type before you count protein
Start by separating tuna into the form you actually ate: raw tuna steak, canned light tuna, canned albacore, or tuna packed in oil. Protein is similar across tuna types, but not identical. For a quick estimate, 100 g of tuna is commonly in the mid-20s for grams of protein, and albacore is often a bit higher than light tuna.
If you only remember the brand, use the Nutrition Facts panel first. If you have fresh tuna, look it up in USDA FoodData Central. For the most accurate result, match the entry to the exact product and preparation, not just the word “tuna.”
2) Measure the portion the right way
Weigh the edible tuna in grams on a kitchen scale. If it’s canned tuna, drain it first unless the nutrition label says otherwise. If it’s tuna packed in oil, the oil changes the weight and can make the serving look larger than the protein really is.
If you’re using a can size or restaurant portion, don’t assume the whole container equals 100 g of tuna. A simple scale check is the best way to avoid overestimating protein.
3) Use a simple protein estimate
Use this practical range: 100 g tuna fish usually provides about 24–29 g of protein. A quick rule of thumb is that 25 g per 100 g is a safe middle estimate for many tuna products.
Example: if your portion is 150 g and the tuna is about 25 g protein per 100 g, your protein intake is about 37.5 g. Multiply the per-100 g value by your portion in grams, then divide by 100.
4) Avoid the common mistakes
The biggest mistake is mixing up raw, cooked, drained, and undrained weights. Another common error is using the wrong tuna type, especially when switching between light tuna and albacore.
Also watch sodium and mercury guidance if you eat tuna often. Tuna is a lean protein source, but not every tuna product is equally heart- or pregnancy-friendly. When in doubt, check CDC, FDA, or Mayo Clinic guidance on fish choices and safe intake.
Tips
- Use a kitchen scale and weigh the drained tuna only.
- Check whether the label lists protein per 100 g, per serving, or per can.
- Treat 25 g protein per 100 g as a practical estimate unless you have a label or database match.
- If you track meals often, save your most common tuna product as a preset so you do not recalculate every time.
- If you pair tuna with training, measuring protein consistently helps you match food intake to workout goals.
Sources
- FoodData Central — USDA
- CDC — Centers for Disease Control and Prevention
- Mayo Clinic — Mayo Clinic
- Harvard Health Publishing — Harvard Health
- PubMed — National Library of Medicine
Frequently Asked Questions
How much protein is in 100 gm tuna fish?
Usually about 24 to 29 grams, depending on the tuna type and whether it is raw, canned, drained, or packed in oil.
Is canned tuna higher in protein than fresh tuna?
Not usually. The protein is similar by weight, but canned tuna can seem denser after draining, so the serving may look smaller.
How do I calculate protein from my tuna portion?
Multiply the protein per 100 g by your portion weight in grams, then divide by 100.
Should I weigh tuna before or after draining?
After draining, unless the label specifically says to use the undrained amount.
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