Quick answer: mountain dew calories are 170 per 12 oz can with 46 g of sugar — about 11.5 teaspoons — and a 20 oz bottle runs 290 calories with 77 g of sugar, nearly 19 teaspoons. Zero Sugar is the only version at 0 calories. Everything below is the label math by size, how Dew stacks up against the other big sodas, and what that sugar load actually looks like in teaspoons.
Mountain Dew gets its own calorie question for two reasons. First, it is the sweetest of the big-name sodas — per can it carries more sugar than Coca-Cola, Pepsi or Sprite, as the comparison table below shows. Second, it is sold hard in big formats: the 20 oz bottle at every checkout and gas station is not a serving and a bit, it is nearly two cans in a single container that most people finish in one sitting. Add caffeine to the mix and Dew is less a drink-with-lunch than a habit of its own, which is exactly why the numbers deserve a clear look.
One note on sources before the tables: unless a row says otherwise, every value here is the label value for MTN DEW Original. The flavored versions — Voltage, Live Wire, Baja Blast and the rest — have their own labels and their own numbers, and limited-edition flavors come and go. The sizes below are the ones people actually buy every day.
The Size Table
Here is MTN DEW Original by container, with sugar and caffeine alongside the calories — because with this soda, the sugar is the story:
| Size | Calories | Sugar | Caffeine |
|---|---|---|---|
| 12 oz can | 170 | 46 g | 54 mg |
| 20 oz bottle | 290 | 77 g | 91 mg |
| 2-liter bottle (whole bottle) | About 960 | About 259 g | About 304 mg |
| Diet / Zero Sugar (12 oz) | 0 | 0 g | 68 mg (Zero Sugar) |
Read the 2-liter row carefully: about 960 calories is the WHOLE bottle — all 67.6 oz of it — not a serving. Nobody is meant to drink it in one sitting, and the label’s own serving is 12 oz. A normal glass poured from that bottle is the same 170 calories and 46 g of sugar as the can. The whole-bottle number matters for a different reason: it shows what is sitting in the fridge. A household that finishes a 2-liter in a couple of days is moving nearly a thousand soda calories through the kitchen, one unremarkable glass at a time.
The 20 oz bottle is the sneakiest row. It looks like a single serving — it is sold as one, priced as one, and finished as one — but at 290 calories and 77 g of sugar it is 1.7 cans wearing a bottle shape. If you drink one daily, the honest way to log it is 290, not the 170 the can has trained you to type.
On caffeine: a can’s 54 mg is more than a typical cola carries, and the 20 oz bottle’s 91 mg is in small-coffee territory — worth knowing if your second bottle lands late in the day. One surprise in the table: the Zero Sugar row shows 68 mg of caffeine, slightly MORE than the original can’s 54 mg. Diet Mountain Dew and Mountain Dew Zero Sugar are not identical products — they differ slightly in caffeine and in the sweetener blend — but the number that matters most is shared: both are 0 calories and 0 g of sugar.
Dew vs the Other Sodas
Same can size, four sodas. This is the comparison that explains why Dew has its own article:
| Soda (12 oz) | Calories | Sugar |
|---|---|---|
| MTN DEW Original | 170 | 46 g |
| Coca-Cola | 140 | 39 g |
| Pepsi | 150 | 41 g |
| Sprite | 140 | 38 g |
The point: Dew is the sweetest of the big four per can. Against Coca-Cola it carries 7 g more sugar and 30 more calories in the identical 12 oz can — and Pepsi, the next sweetest, still sits 5 g of sugar and 20 calories below it. None of these drinks is a health food, and this site is not going to pretend the 140-calorie colas are virtuous. But if two habits are otherwise equal — a can of soda with lunch every day — the Dew version of that habit is the most expensive one on the shelf, and it compounds: 30 extra calories a day over Coke is roughly 11,000 calories a year before the size upgrades even start.
The Sugar in Teaspoons
Grams of sugar are hard to picture, so convert them. A level teaspoon of sugar is about 4 g. The 46 g in a can of Mountain Dew is about 11.5 teaspoons. The 77 g in a 20 oz bottle is about 19 teaspoons. If you stood in your kitchen and spooned sugar into a glass nineteen times, you would stop long before the end and call it absurd — drinking it dissolved and ice-cold is simply easier to finish, which is precisely the problem with liquid sugar: it arrives without the chewing, the fullness or the pause that eating 19 teaspoons would force on you.
Now set that against the daily budget. A commonly cited added-sugar limit is 25 g a day for women and 36 g a day for men. One 12 oz can, at 46 g, is nearly twice the women’s figure and well past the men’s — before food, before dessert, before the sweetened coffee. A 20 oz bottle is more than double the men’s limit on its own. That is why the honest framing for Mountain Dew is: treat, not thirst-quencher. It is priced, flavored and caffeinated like an everyday drink, but its sugar load belongs in the same mental category as dessert.
The practical lever is the swap, and the table above prices it exactly. Moving a daily can from Original to Zero Sugar saves 170 calories and 46 g of sugar a day — about 1,190 calories a week — with the caffeine actually rising slightly, which is why the swap sticks for so many people: nothing about the ritual changes except the sugar. If Zero Sugar’s taste is a dealbreaker, the halfway moves are the can instead of the 20 oz bottle (saving 120 calories and 31 g of sugar), and Dew with meals only rather than as the all-day desk drink.
Frequently Asked Questions
How many calories in a Mountain Dew can?
170 calories in a 12 oz can of MTN DEW Original, with 46 g of sugar and 54 mg of caffeine.
How many calories in a 20 oz Mountain Dew?
290 calories in a 20 oz bottle, with 77 g of sugar and 91 mg of caffeine. The bottle looks like one serving but holds nearly two cans’ worth.
How much sugar is in Mountain Dew?
46 g of sugar in a 12 oz can — about 11.5 teaspoons — and 77 g in a 20 oz bottle, about 19 teaspoons.
Does Mountain Dew Zero Sugar have calories?
No — Mountain Dew Zero Sugar has 0 calories and 0 g of sugar per 12 oz, with 68 mg of caffeine. Diet Mountain Dew is also 0 calories, with a slightly different caffeine and sweetener profile.
Is Mountain Dew worse than Coke?
Per can, yes on both counts people ask about: Mountain Dew has 46 g of sugar and 170 calories per 12 oz, versus Coca-Cola’s 39 g and 140. Dew is the sweetest of the big four sodas per can.
The bottom line: mountain dew calories are 170 for the can, 290 for the bottle most people actually buy, and 0 for Zero Sugar — and at 46 g of sugar a can, Dew is the sweetest seat in the soda aisle. Keep it in the treat column, mind the bottle size, and the drink costs you nothing you have not already counted.
Using These Numbers Day to Day
The tables above cover cans and bottles, but a lot of Mountain Dew is poured, not packaged — fountain cups at restaurants, fast-food counters and gas stations. Those cups play by looser rules: sizes vary by chain, ice takes up part of the volume, and the refill is usually free. The yardstick that keeps you honest is the can row: every 12 oz of MTN DEW Original is 170 calories and 46 g of sugar, whatever it is poured from. A large fountain cup filled twice can pass the 20 oz bottle’s 290 calories without ever looking like a big drink, because it arrived in two innocent-looking trips. If you are counting, count the pours, not the cup.
And a final word on the wider Dew family, because the shelf is crowded: the flavored versions — the fruit and citrus spin-offs that rotate through stores — each carry their own label, and their sugar and calorie counts are not automatically the Original’s 170 and 46. Some sit close, some do not, and limited editions change recipes without much announcement. The same goes for the energy-drink offshoots, which are different products entirely. The habit worth building is the two-second label check: calories and sugar are printed on every can, and for a drink whose entire story is sugar, those two lines are the whole review.
