Reese's Peanut Butter Cup (1 Cup) Calories & Carbs
Last updated September 8, 2026 · Compiled by the CarbMeNot Team
Values per 1 cup (21g), 21g; per 100 g: 57.1g net carbs, 500 cal. Net carbs = total carbs − fiber − sugar alcohols — do the math for any label with the free net carbs calculator.
How many carbs are in reese's peanut butter cup (1 cup)?
Reese's Peanut Butter Cup (1 Cup) — 1 cup (21g), 21g — has 12g net carbs: 12.5g total carbs minus 0.5g fiber, plus 2.5g protein, 6.5g fat, and 105 calories. Per 100g that is 57.1g net carbs (59.5g total carbs, 2.4g fiber) and 500 calories. That makes reese's peanut butter cup (1 cup) high in net carbs and higher than the typical dairy food, which averages about 24.2g net carbs per 100g. At this carb count, reese's peanut butter cup (1 cup) is best limited to small portions on keto (usually 20–50g net carbs per day). Values are per 100 g, sourced from Manufacturer-reported values; net carbs are computed by CarbMeNot.
Is reese's peanut butter cup (1 cup) keto-friendly?
Reese's Peanut Butter Cup (1 Cup) is borderline for keto — it works only in small portions. 1 cup (21g), 21g is 12g net carbs (12.5g total carbs − 0.5g fiber); per 100g that is 57.1g net carbs. On a standard keto diet (20–50g net carbs per day), even one serving uses a large share of your daily carbs, so keep portions small or save it for a higher-carb day.
Keeping an eye on carbs in reese's peanut butter cup (1 cup)?
Reese's Peanut Butter Cup (1 Cup) runs higher in carbs, so portions matter. CarbMeNot tracks every gram from a photo, so you stay under your daily limit without the math.
Carbs by serving size
| Serving | Net carbs | Total carbs | Protein | Calories |
|---|---|---|---|---|
| 1 cup (21g) | 12g | 12.5g | 2.5g | 105 |
| 100 g (3.5 oz) | 57.1g | 59.5g | 11.9g | 500 |
| 1 oz (28 g) | 16g | 16.7g | 3.3g | 140 |
How many calories are in reese's peanut butter cup (1 cup)?
Reese's Peanut Butter Cup (1 Cup) — 1 cup (21g), 21g — has 105 calories, with 2.5g protein, 6.5g fat, and 12g net carbs. Per 100g: 500 calories and 57.1g net carbs.
Nutrition facts
| Nutrient | Amount (per 100 g) |
|---|---|
| Calories | 500 |
| Total carbs | 59.5g |
| Net carbs | 57.1g |
| Fiber | 2.4g |
| Sugar | 50g |
| Sugar alcohols | 0g |
| Protein | 11.9g |
| Fat | 31g |
| Sodium | 333mg |
| Potassium | 333mg |
Source: Manufacturer-reported values (snacks-sweets). Net carbs = total carbs − fiber − sugar alcohols, computed by CarbMeNot.
Log reese's peanut butter cup (1 cup) in one tap
Snap a photo and CarbMeNot's AI logs the carbs, protein, and fat automatically.
Frequently asked questions
- How many carbs are in reese's peanut butter cup (1 cup)?
- Reese's Peanut Butter Cup (1 Cup) (1 cup (21g), 21g) has 12.5g of total carbs and 12g of net carbs. Per 100 grams: 59.5g total, 57.1g net.
- How many net carbs are in reese's peanut butter cup (1 cup)?
- Reese's Peanut Butter Cup (1 Cup) has 12g of net carbs per 1 cup (21g), 21g — 12.5g total carbs minus 0.5g fiber.
- Is reese's peanut butter cup (1 cup) keto-friendly?
- Reese's Peanut Butter Cup (1 Cup) is borderline for keto — it works only in small portions. 1 cup (21g), 21g is 12g net carbs (12.5g total carbs − 0.5g fiber); per 100g that is 57.1g net carbs. On a standard keto diet (20–50g net carbs per day), even one serving uses a large share of your daily carbs, so keep portions small or save it for a higher-carb day.
- How many calories are in reese's peanut butter cup (1 cup)?
- Reese's Peanut Butter Cup (1 Cup) (1 cup (21g), 21g) has 105 calories; that is 500 calories per 100 grams.
Similar foods
CarbMeNot provides general nutrition information, not medical advice. Values are estimates — verify before relying on them for any health decision. See our Medical Disclaimer.