NourmioHow to compare protein bars with different serving sizes
Compare two US protein bar labels per whole bar and per 50 g. See why the calorie order changes and how to log the portion you ate.
If you're eating a whole bar, use the numbers for one bar on its label. To compare equal amounts, scale each label to the same weight. A bar can have more calories per wrapper and fewer per gram because it contains more food.
Read the whole-bar amounts first
Check the flavor and serving weight. The FDA explains that the values on a Nutrition Facts panel refer to the serving shown. For these two US products, a serving is one bar.
| One bar | Calories | Total sugar |
|---|---|---|
| think! Oatmeal Chocolate Chunk, 60 g | 210 kcal | 1 g |
| RXBAR Chocolate Sea Salt, 52 g | 200 kcal | 14 g |
The think! product page gives the nutrition for one bar, and the wrapper on that page shows its 60 g weight. The RXBAR panel lists the 52 g weight alongside its one-bar serving.
Compare the same weight to see the difference
Multiply each label value by the weight you’re comparing ÷ the serving weight. At 50 g, the think! example gives 210 × 50 ÷ 60 = 175 kcal. The RXBAR example gives 200 × 50 ÷ 52 ≈ 192 kcal. The think! bar has more calories per whole bar, but fewer at 50 g. The whole think! bar weighs 8 g more.
The same calculation gives about 0.8 g total sugar for 50 g of the think! bar and 13.5 g for 50 g of the RXBAR. These are estimates from the printed figures. Use the whole-bar values if you eat one full bar.
Keep the sugar lines separate
Both panels list 0 g added sugars. Their total sugar values still differ. The think! label also lists 3 g sugar alcohol per bar. Keep that amount separate from the 1 g total sugar. The RXBAR panel has no separate sugar-alcohol amount. For help reading that part of the panel, see what the sugar alcohol line tells you.
Log the amount you ate
If you eat 26 g of the 52 g RXBAR, that’s half a serving. Scaling the label gives 100 kcal and 7 g total sugar for that amount. If you scan the barcode in Nourmio, check the flavor and weight against the wrapper. Enter the matching amounts manually if the lookup differs.
