Are you tracking added sugar but still want to include shelf-stable seafood in your diet? The Sardine Sugar Per 100g Calculator gives you a fast estimate of the sugar in your sardine serving, whether it comes from plain fresh fillets, canned fish packed in oil or water, or tomato-sauce varieties that often carry hidden sweeteners.
Choose a preparation type, enter your portion size in grams or ounces, and the calculator converts everything to a per-100g benchmark and your actual plate. You can even switch to Custom and type in the sugar-per-100g number from the label on your own can — useful when brands differ. The results also show the serving’s contribution to a 50g daily added-sugar reference.
This tool is designed for meal planners, low-sugar dieters, and anyone who wants to compare seafood options without reading tiny nutrition labels.
🐟 Sardine Sugar Per 100g Calculator
Estimate the sugar content of a sardine portion, from fresh fillets to tomato-sauce cans.
How to Use This Tool
Start by choosing the sardine preparation that matches your meal. The preset options — fresh/raw, canned in oil, canned in water, and canned in tomato sauce — use representative sugar values for a 100g portion. For a packaged product, choose Custom — use my label, then enter the sugar value listed under of which sugars on the nutrition facts panel.
Next, enter your serving size. You can type any amount in grams or ounces, or tap one of the quick portions such as 85 g (a typical small can) or 3 oz. The calculator uses drained edible weight, so if your can includes oil or water, enter the weight of fish you actually eat, not the total can contents including liquid.
If your tin lists nutrition per can rather than per 100g, divide the total sugar by the can weight and multiply by 100 to get the per-100g value before entering it in the custom field.
Press Calculate sugar to see the sugar in your serving, the sugar density per 100g, and how much of a 50g daily added-sugar reference that portion uses up.
How It Works
The calculation is a simple proportion. Once the serving size is converted to grams, the formula is:
Total sugar (g) = Sugar per 100g (g) × Serving weight (g) ÷ 100
If you enter ounces, the tool first multiplies by 28.3495 to convert to grams. The daily-value percentage is then found by dividing total sugar by 50g (the FDA reference amount for added sugar on Nutrition Facts labels for most adults) and multiplying by 100.
Using a per-100g basis matters because cans and fillets come in many sizes. A 125g can and an 85g can may look similar on a shelf, but the sugar concentration per 100g is what lets you compare products fairly. The reference values in this calculator are based on typical USDA FoodData Central entries for sardines; raw fish and plain canned sardines in oil or water contain essentially no sugar, while tomato-sauce versions can contain added sugar or naturally occurring sugars from tomato concentrate. You can look up official values at USDA FoodData Central.
Worked Examples
Example 1: Tomato-sauce sardines. You eat a 100g portion of sardines canned in tomato sauce with 1.6g sugar per 100g. Total sugar = 1.6 × 100 ÷ 100 = 1.6g. That is 1.6 ÷ 50 × 100 = 3.2% of the daily added-sugar reference.
Example 2: Fresh sardine fillets. A grilled serving of 85g fresh sardines has 0g sugar per 100g. Total sugar = 0 × 85 ÷ 100 = 0g. Even a large 170g portion would still contain 0g of sugar, provided no sweet marinade or sauce is added.
Example 3: Reading a label. Your can says the whole drained contents (120g) contain 2.4g total sugar. The per-100g value is 2.4 ÷ 120 × 100 = 2g. If you eat 60g, your portion has 2 × 60 ÷ 100 = 1.2g sugar.
Common Mistakes to Avoid
- Entering the entire can, liquid included. Oil and water packing liquids are mostly not eaten, and they change the weight denominator. Use the weight of fish you actually consume.
- Confusing total carbohydrates with sugar. Sardines are naturally very low in carbohydrate, but a label may show a small sugars line from added sauce. Always look at the sugars line, not just total carbs.
- Assuming all tomato-sauce brands are the same. Sugar values can range from under 1g to 3g per 100g depending on the recipe. Check the label or use the custom field.
- Forgetting marinades, glazes, or flavored oils. Smoked sardines are typically sugar-free, but sweet-smoked, teriyaki, or mustard varieties may include sugar or honey.
- Thinking no added sugar means zero sugar. Tomato products naturally contain some fruit sugar, so the label may still show a small number.
Reference Sugar Values
The table below shows representative sugar-per-100g values used by the calculator. They are estimates for menu planning, not a substitute for the label on your specific product.
| Sardine type | Sugar per 100g |
|---|---|
| Fresh / raw sardines | 0.0 g |
| Canned in oil, drained | 0.0 g |
| Canned in water, drained | 0.0 g |
| Smoked sardines | 0.0 g |
| Canned in tomato sauce | 1.0 – 2.5 g |
| Marinated / sweet-glazed | 2.0 – 6.0 g |
These are typical ranges, not guarantees. Always use the nutrition facts panel when following a strict low-sugar or ketogenic plan.
Frequently Asked Questions
Do sardines contain sugar naturally? Fresh fish, including sardines, contains virtually no sugar. Carbohydrate values for plain sardines are usually 0g per 100g, so any sugar shown on a canned product label is likely coming from a sauce, seasoning, or added sweetener.
Are sardines okay on a low-sugar or keto diet? Yes. Plain sardines in oil or water are excellent low-carb, low-sugar protein sources. Tomato-sauce varieties are still usually low in sugar — often under 3g per 100g — but check labels if you are being strict.
What does of which sugars mean on a label? It is the total sugar in the product, including both added sugar and naturally occurring sugar from ingredients such as tomato paste or vinegar-based sauces.
How do sardines compare with other seafood? Most unseasoned fish and shellfish have little to no sugar. If you also track crab meat, the crab sugar per 100g calculator shows a similar format for comparing your seafood choices.