Caffeine in candy bars: Kit Kat, M&M's, Snickers, Hershey's and more
How much caffeine is in Kit Kat, M&M's, Snickers, Twix, Reese's, Hershey's and other candy bars, per bar or pack, from USDA data and CSPI's chart, with sources.
The 10 candy bars and chocolate candies in our chart range from 0.6 mg (Butterfinger, 2.1 oz bar (60 g)) to 10 mg (Hershey's Milk Chocolate Bar, 1.5 oz bar). For reference, Kit Kat has 5.9 mg per 1.5 oz bar (42 g).
Candy bars caffeine chart
Sorted from least to most caffeine; a range sits at its middle, so rows whose amounts overlap could swap places. “Latest time” is when one serving would still leave no more than 50 mg at an 11:00 PM bedtime with average metabolism, timed on the top of a range (how we calculate). Open a drink for its source, sizes and the fast-to-slow range.
| Drink | Serving | Caffeine | Strength | Latest time |
|---|---|---|---|---|
| Butterfinger | 2.1 oz bar (60 g) | 0.6 mg | 1 mg per 100 g | No cutoff for one |
| Tootsie Roll | 6 pieces (40 g) | 2.8 mg | 7 mg per 100 g | No cutoff for one |
| Reese's Peanut Butter Cups | 1.6 oz package, 2 cups (45 g) | 3.2 mg | 7 mg per 100 g | No cutoff for one |
| Milky Way | 2.05 oz bar (58 g) | 3.5 mg | 6 mg per 100 g | No cutoff for one |
| Twix | 2.06 oz package, 2 bars (58 g) | 4.1 mg | 7 mg per 100 g | No cutoff for one |
| 3 Musketeers | 2.13 oz bar (60 g) | 4.2 mg | 7 mg per 100 g | No cutoff for one |
| Snickers | 2 oz bar (57 g) | 4.6 mg | 8 mg per 100 g | No cutoff for one |
| Kit Kat | 1.5 oz bar (42 g) | 5.9 mg | 14 mg per 100 g | No cutoff for one |
| M&M's | 1.69 oz package of milk chocolate M&M's (48 g) | 6.7 mg | 14 mg per 100 g | No cutoff for one |
| Hershey's Milk Chocolate Bar | 1.5 oz bar | 10 mg | – | No cutoff for one |
Common questions
Does a Hershey's bar have more caffeine than a Kit Kat?
Hershey's Milk Chocolate Bar has more caffeine than Kit Kat per typical serving. Hershey's Milk Chocolate Bar: 10 mg per 1.5 oz bar; Kit Kat: 5.9 mg per 1.5 oz bar (42 g).
Does Milky Way have more caffeine than Snickers?
Milky Way has less caffeine than Snickers per 100 g (6 vs 8 mg). Milky Way: 3.5 mg per 2.05 oz bar (58 g); Snickers: 4.6 mg per 2 oz bar (57 g).
Does a Snickers bar have as much caffeine as a cup of coffee?
Snickers has less caffeine than brewed coffee per 100 g (8 vs 40 mg). Snickers: 4.6 mg per 2 oz bar (57 g); Brewed coffee: 94.8 mg per 8 fl oz cup (237 g).
General information, not medical advice
If you feel unwell after caffeine — for example chest pain, a fast or irregular heartbeat that does not settle, fainting, confusion or trouble breathing — get urgent medical help. If you are pregnant or breastfeeding, under 18, take medication, or have a heart, liver or anxiety condition, high blood pressure or a sleep disorder, ask a doctor or pharmacist what amount is right for you.
An app for better sleep is on the way
We’re working on a mobile app to help you sleep better. It isn’t out yet. Leave your email and we’ll let you know when it launches.