Peanut Butter Nutrition Calculator — Calories & Protein per Tablespoon

Smooth peanut butter (FDC 172470) delivers 25.09g protein per 100g — the highest of any commonly consumed nut or seed butter. Almond butter follows at 21.0g, cashew butter at 17.6g, tahini at 17.0g, and sunflower seed butter at 17.3g. Two tablespoons (32g) provide 8.0g protein — as much as a medium egg ^[1].

The protein comes from peanuts themselves, which at 25.8g per 100g are technically legumes, not tree nuts — giving them a natural protein advantage. Grinding into butter preserves virtually all the protein, losing only trace amounts to oil separation that floats to the top ^[1].

Niacin (vitamin B3): 13.11mg per 100g (82% DV) — by far the highest among all nut butters. Almonds have 3.58mg, cashews 1.6mg. Two tablespoons of peanut butter provide 4.2mg niacin (26% DV) — a contribution most people don't associate with a sandwich spread ^[1][2].

Per 100g, smooth peanut butter has 588 kcal and crunchy has 589 kcal — a nutritionally irrelevant 1-calorie difference. The macros are similarly close: smooth has 25.1g protein / 50.4g fat / 19.6g carbs; crunchy has 24.1g / 49.9g / 21.6g ^[1].

The real differences: fiber jumps from 6.35g (smooth) to 7.7g (crunchy) — a 21% increase from the intact peanut pieces. Sugar drops from 9.22g to 7.53g (18% less in crunchy) because some brands add less sweetener to crunchy formulations. Sodium increases slightly: 459mg to 486mg (6% more in crunchy) ^[1].

For logging purposes, smooth and crunchy peanut butter are interchangeable on calories, protein, and fat. Choose crunchy for more fiber and less sugar, smooth for easier spreading and more precise portioning (no chunky pieces throwing off tablespoon measurements) ^[1].

Powdered peanut butter (PB2-style) has 375 kcal per 100g vs regular's 588 kcal — a 36% calorie reduction. Fat drops from 50.4g to 12.5g — a 75% decrease. Protein concentrates to 50g per 100g — double the regular version, because removing fat concentrates everything else ^[1].

A 2-tablespoon serving of powder (12g dry) has just 45 kcal, 6.0g protein, 1.5g fat, and 3.0g carbs. The same volume of regular peanut butter (32g) has 188 kcal and 8.0g protein. The powder delivers 75% of the protein at 24% of the calories ^[1].

The trade-off: sodium jumps to 750mg per 100g (vs 459mg regular), and sugar to 12.5g (vs 9.2g) — manufacturers add salt and sweetener to compensate for lost flavor from fat removal. The powder also lacks the creamy mouthfeel; reconstituted with water, it's thinner than natural peanut butter. For protein-focused tracking, the calorie efficiency is unmatched among peanut products ^[1].

Regular smooth peanut butter: 459mg sodium per 100g (20% DV). Natural (unsalted): 17mg per 100g (<1% DV). That's a 27x difference. Per 2-tablespoon serving: 147mg vs 5mg. Over a year of daily PB&J sandwiches, switching to natural saves roughly 51,830mg sodium — equivalent to 22 teaspoons of salt ^[1].

Reduced-fat peanut butter has the highest sodium: 542mg per 100g (24% DV) — 18% more than regular. Manufacturers add salt to offset flavor lost when fat is removed. Powdered PB (PB2-style) is even higher at 750mg per 100g. The lowest-fat options are paradoxically the highest-sodium ^[1].

Crunchy peanut butter: 486mg sodium per 100g — 6% more than smooth. The sodium differences between variants are more significant than the calorie differences for most people's daily monitoring. If a recipe calls for peanut butter, using natural unsalted and adding your own pinch of salt gives full sodium control ^[1].

Classic PB&J: 2 slices white bread (50g, 133 kcal) + 2 tbsp smooth peanut butter (32g, 188 kcal) + 1 tbsp grape jelly (20g, 50 kcal) = 371 kcal total, 13g protein, 18g fat, 40g carbs. The peanut butter alone is 51% of the sandwich's calories ^[1].

Upgrading to whole wheat bread (50g, 128 kcal) + natural unsalted PB (190 kcal) + low-sugar jam (25 kcal) = 343 kcal, 14.7g protein, 19g fat, 31g carbs. The swap saves 28 kcal, adds 1.7g protein, and reduces sugar by approximately 12g vs the classic version ^[1].

For protein-focused tracking: replacing jelly with banana slices (half, 60g, 53 kcal): 371 kcal, 14g protein, 18g fat, 42g carbs, 5.2g fiber. Same calories as the jelly version but with 4g more fiber, natural sugars instead of added, and 215mg extra potassium from the banana ^[1][2].