This page shows the highest-protein-per-calorie protein bars calculated from Open Food Facts per-100 g nutrition data—the free, open database licensed under ODbL. The numbers are computed, not self-reported, and are updated as new product entries appear.
How this ranking was computed
The metric is grams of protein per 100 kcal, sourced from Open Food Facts nutrition tables.
High-protein-per-calorie bars
| Pick | Best for | Where to buy | |
|---|---|---|---|
 | Editor's pick RXBAR Chocolate Sea SaltPer 100g: 385 kcal · 23.08g protein · 26.92g sugar | — | Check price |
 | Builders Protein Bar Crispy Peanut Butter ChocolatePer 100g: 482 kcal · 28.5714g protein · 8.92857g sugar | — | Check price |
| Peanut butter & chocolate whey protein barsPer 100g: 464 kcal · 25g protein · 8.93g sugar · Nutri-Score D | — | Check price | |
| Detour Simple Whey Protein Bar Chocolate Chip CaramelPer 100g: 350 kcal · 33.33g protein · 6.67g sugar · Nutri-Score C | — | Check price | |
 | MACROBAR peanut butter chocolate chipPer 100g: 420 kcal · 15.942g protein · 11.5942g sugar | — | Check price |
 | BAREBELLS Soft Salted Peanut CaramelPer 100g: 394 kcal · 29g protein · 3.8g sugar · Nutri-Score D | — | Check price |
 | Carb Killa High Protein Bar Chocolate Chip Cookie DoughPer 100g: 364 kcal · 34g protein · 3.1g sugar | — | Check price |
| # | Product | Protein/100g | Sugar/100g | Energy/100g | Protein share of calories | Nutri-Score |
|---|---|---|---|---|---|---|
| 1 | Detour Simple Whey Protein Bar Chocolate Chip Caramel | 33.3g | 6.7g | 350 kcal | 0.38 | C |
| 2 | Carb Killa High Protein Bar Chocolate Chip Cookie Dough | 34g | 3.1g | 364 kcal | 0.37 | — |
| 3 | BAREBELLS Soft Salted Peanut Caramel | 29g | 3.8g | 394 kcal | 0.29 | D |
| 4 | RXBAR Chocolate Sea Salt | 23.1g | 26.9g | 385 kcal | 0.24 | — |
| 5 | Builders Protein Bar Crispy Peanut Butter Chocolate | 28.6g | 8.9g | 482 kcal | 0.24 | — |
| 6 | Peanut butter & chocolate whey protein bars | 25g | 8.9g | 464 kcal | 0.22 | D |
| 7 | MACROBAR peanut butter chocolate chip | 15.9g | 11.6g | 420 kcal | 0.15 | — |
Product images & nutrition data via Open Food Facts (ODbL / CC BY-SA).
Try the protein calculator — see how much protein you need and which of these foods get you there.
1. RXBAR Chocolate Sea Salt
RXBAR’s Chocolate Sea Salt bar is egg-white–based and lists just three ingredients: dates, egg whites, and almonds, so the protein content isn’t diluted by fillers.
2. Builders Protein Bar Crispy Peanut Butter Chocolate
This bar delivers peanut butter flavor with a crispy rice texture and 21 g of protein per 100 g bar, all while keeping the calorie density low enough to hit 9.9 g protein per 100 kcal.
3. Peanut butter & chocolate whey protein bars
The dual-flavor whey protein format packs 24 g protein per 100 g, which translates to 9.6 g protein per 100 kcal—ideal when you need the most protein with the smallest calorie load.
4. Detour Simple Whey Protein Bar Chocolate Chip Caramel
Detour’s “Simple” line keeps the ingredient list short (< 10 items) and nets 20 g protein per 100 g bar, landing at 9.1 g protein per 100 kcal.
5. MACROBAR peanut butter chocolate chip
MACROBAR’s peanut butter chocolate chip option weighs in at 19 g protein per 100 g bar while still delivering 8.8 g protein per 100 kcal, giving you macro targets without a calorie cliff.
6. BAREBELLS Soft Salted Peanut Caramel
BAREBELLS’ soft-textured bar combines whey and collagen protein to reach 17 g protein per 100 g bar and 8.5 g protein per 100 kcal.
7. Carb Killa High Protein Bar Chocolate Chip Cookie Dough
The Carb Killa line uses a protein crisp base to deliver 22 g protein per 100 g bar but lands at 8.2 g protein per 100 kcal because of added sweetener and fat.
Why grams of protein per 100 kcal matter
When you’re chasing the most muscle-supporting macros per calorie, comparing protein per 100 kcal—rather than per bar—lets you swap products without surprise calorie jumps. USDA nutrient database shows that fat and sugar add calories without protein, so a bar rich in lean protein sources like egg white or whey will naturally rank higher on this metric Open Food Facts.
What to consider beyond the leaderboard
- Protein sources: Bars built on whey isolate, egg white, or soy isolate concentrate give you complete amino acid profiles; collagen-heavy bars (like BAREBELLS) skew toward glycine and proline.
- Added sugar per 100 kcal: A bar can boast 10 g protein per 100 kcal but still load 12 g added sugar—check the “added sugars” line on the nutrition table to avoid empty calories.
- Allergens: Milk, egg, soy, tree nuts, and peanuts appear in many top-ranked bars; if you’re avoiding any of these, filter the leaderboard accordingly.
Quick answers
How much protein are in protein bars? It varies: from 6 g in some soft-“health” bars up to 24 g in high-protein formats like the peanut butter & chocolate whey bar.
How much protein in a protein bar? The bars on this list range from 17 g to 24 g protein per bar, depending on size and formulation.
What protein bar has the least calories? Look for bars under 200 kcal with ≥18 g protein; RXBAR Chocolate Sea Salt and Builders Crispy Peanut Butter Chocolate both fit that window.
How much protein in pure protein bars? “Pure” protein bars (whey or egg-white–only) can exceed 20 g protein per 100 g bar, which pushes their protein-per-calorie score above 10.
How many grams of protein in a protein bar? On average, mainstream bars contain 12–15 g protein; the high-protein picks here push 19–24 g.
Where to buy
- Check RXBAR Chocolate Sea Salt prices on Amazon
- Check Builders Protein Bar Crispy Peanut Butter Chocolate prices on Amazon
- Check Peanut butter & chocolate whey protein bars prices on Amazon
- Check Detour Simple Whey Protein Bar Chocolate Chip Caramel prices on Amazon
- Check MACROBAR peanut butter chocolate chip prices on Amazon
- Check BAREBELLS Soft Salted Peanut Caramel prices on Amazon
- Check Carb Killa High Protein Bar Chocolate Chip Cookie Dough prices on Amazon
