Plain Water Has Zero Calories, But Not All "Water" Does
Plain water has zero calories. Zero sugar, zero fat, zero protein. According to the USDA FoodData Central database, water contains none of the macronutrients that provide caloric energy, which makes it genuinely calorie-free.
This applies to every form of plain water: tap, spring, mineral, filtered, and distilled. If nothing has been added, your water calories total exactly 0 per glass, per bottle, or per gallon.
Here is where it gets tricky. Walk down the beverage aisle and you will find dozens of products with "water" right on the label, from vitamin water to electrolyte water to flavored sparkling water, that quietly pack 50 to 120 calories per bottle. Knowing which "waters" are truly calorie-free and which are not can save you hundreds of hidden calories every week. One labeling detail to keep in the back of your mind: the FDA allows products with fewer than 5 calories per serving to be labeled "zero calories", so plain water is the only drink guaranteed to be truly zero, every time.
How Many Calories Are in Each Type of Water?
The calories in water-based drinks vary widely depending on what has been added. Here is a side-by-side breakdown using USDA nutritional data:
| Water Type | Calories per 8 oz | Calories per Bottle (16.9 oz) | Sugar |
|---|---|---|---|
| Plain tap water | 0 | 0 | 0g |
| Spring water | 0 | 0 | 0g |
| Mineral water | 0 | 0 | 0g |
| Filtered water | 0 | 0 | 0g |
| Distilled water | 0 | 0 | 0g |
| Plain sparkling water | 0 | 0 | 0g |
| Tonic water | about 32 | about 68 | 8g |
| Flavored water (sweetened) | 0 to 60 | 0 to 120 | 0 to 30g |
| Vitamin water | about 50 | about 106 | 13g |
| Coconut water | about 46 | about 97 | 6g |
| Sports drinks | about 50 | about 106 | 14g |
| Fruit juice | about 112 | about 237 | 24g |
Plain, Spring, Mineral, and Filtered Water
All forms of plain water, whether it comes from your tap, a natural spring, or a filtration system, contain zero calories. The only differences between them are mineral content and taste.
Spring and mineral water may contain naturally occurring calcium, magnesium, and potassium, but minerals do not add calories (more on that below). If you are wondering how the various water types differ, see our guide on filtered water vs purified water, and our overview of the healthiest water to drink if you want the full picture.
Filtered water removes chlorine taste, sediment, and common contaminants while keeping the calorie count at exactly zero.
Sparkling and Carbonated Water
Plain sparkling water, sometimes called seltzer, has zero calories. The carbonation (dissolved CO2) adds no calories, sugar, or fat. If you enjoy the fizz, sparkling water is a solid calorie-free alternative to soda.
Tonic water is the exception. Despite looking and sounding similar, tonic water contains added sugar, about 32 calories and 8 grams of sugar per 8-ounce serving. Always check the label. The same goes for flavored sparkling waters: some use zero-calorie sweeteners, while others add real sugar.
Flavored, Enhanced, and Vitamin Water
This is where "water" starts getting misleading. Many enhanced and vitamin water products are marketed as healthy hydration, but they can pack serious calories.
A serving of vitamin-enhanced water runs roughly 50 calories and 13 grams of sugar per 8 ounces. Since these bottles usually hold 16 to 20 ounces, finishing one can deliver around 110 to 120 calories and 25 to 32 grams of sugar, close to what you would find in a can of soda. That "healthy" label can be deceiving, so it pays to read the nutrition panel rather than the marketing on the front.
Remember that FDA rule: a flavored water might say "0 calories" on the front while still containing a small amount per serving. Check the ingredient list for sweeteners like sucralose, aspartame, or stevia. They signal a product that needed sweetening, even when the calorie count reads zero.
Sports Drinks and Coconut Water
Sports drinks contain approximately 50 calories per 8-ounce serving, primarily from sugars and carbohydrates designed to fuel athletes during intense exercise. If you are not sweating through a hard workout, those extra calories may not be worth it.
Coconut water runs about 46 calories per 8 ounces from natural sugars. It is often marketed as a low-calorie option, but it is not calorie-free, and commercially packaged versions sometimes add extra sweeteners that push the count even higher.
Do the Minerals in Water Add Calories?
No. Minerals contain zero calories. This is a common point of confusion worth clearing up.
Calories come exclusively from three macronutrients: carbohydrates, protein, and fat. Minerals like calcium, magnesium, potassium, and sodium are micronutrients. Your body needs them, but they do not provide caloric energy.
That means mineral water, hard water, and water with a higher TDS (total dissolved solids) reading all still contain zero calories. The mineral content affects taste and nutritional value, but never the calorie count.
What Drinks Have Zero Calories?
If you are watching your calorie intake, these beverages contain genuinely zero (or near-zero) calories:
- Plain water: tap, spring, mineral, filtered, or distilled
- Plain sparkling water: unflavored, unsweetened
- Black coffee: no cream, no sugar
- Unsweetened tea: green, black, or herbal
- Certain diet or zero-sugar drinks: though these use artificial sweeteners
Plain water is the simplest, most affordable, and most reliable zero calorie drink on this list. Unlike diet drinks, it has no artificial sweeteners, no additives, and no fine print.
DIY infused water is another great option. Drop sliced cucumber, fresh mint, or a few berries into a pitcher of filtered water and refrigerate for an hour. You get natural flavor with virtually zero calories, far less than store-bought flavored water, and no added sugar or sweeteners.
According to the CDC's guidelines on water and healthier drinks, water should be your go-to beverage throughout the day. The catch most people run into is taste: chlorine flavors, metallic notes, or earthy odors push them toward flavored drinks that come with added sugar. When your water tastes good, staying properly hydrated gets a lot easier, and when you weigh the long-term cost of filtered tap water against bottled alternatives, the savings add up fast.
A home water filter fixes the taste problem at the source, removing the chlorine, sediment, and contaminants that cause off-flavors without adding a single calorie, gram of sugar, or artificial ingredient. Crystal Quest® has been engineering water filtration systems in the USA for over 30 years, building every system in an ISO 9001 certified facility for homes, restaurants, hospitals, and schools. The pitcher below is an easy starting point with no installation required, or you can explore our countertop water filters and under-sink water filters for a more permanent setup.
Make your tap water the best-tasting zero-calorie drink in your house.
Browse our countertop and drinking water filters to find the right fit for your home, or contact our water specialists if you need help choosing.
Frequently Asked Questions About Calories in Water
Does sparkling water have calories?
Plain, unflavored sparkling water has zero calories. The carbonation itself adds nothing caloric. However, tonic water contains about 32 calories per 8-ounce serving from added sugar, and some flavored sparkling waters may also contain calories depending on the sweetener used.
How many calories does flavored water have?
It depends on the brand and type. Artificially sweetened flavored waters may list 0 to 5 calories per serving. Sugar-sweetened flavored or vitamin-enhanced waters can contain 50 to 120 or more calories per bottle. Always check the nutrition label, not just the marketing on the front.
Can you gain weight from drinking water?
No. Water has zero calories and cannot cause fat gain. You might notice temporary fluctuations on the scale from water retention, but that is water weight, not body fat. It balances out naturally.
Does lemon water have calories?
A squeeze of fresh lemon juice adds about 1 to 3 calories per glass, effectively zero. Lemon water is a great way to add flavor without meaningful calories.
