Juice labels nearly always list energy in kilocalories per 100 millilitres, but many calorie tracking apps, recipe databases and nutrition references present juice values per 100 grams. Because juice is slightly denser than water — typically around 1.03 to 1.06 grams per millilitre — the two numbers are close but not the same.
This calculator converts calories per 100 ml into calories per 100 g using the juice's density. You can choose a common juice type to auto-fill typical label values, adjust them to match your exact carton, and optionally enter a serving size in millilitres to see total calories per glass or bottle.
It is ideal for anyone logging food by weight, comparing products from different countries, or building nutrition plans where serving sizes are expressed in grams.
🥤 Juice Energy Converter
Convert nutrition label values from per 100 ml to per 100 g, then estimate your serving.
How to Use This Tool
Start by picking a juice type from the dropdown menu. The calculator loads a typical label value for calories per 100 ml and a realistic density for that juice, so you can get an approximate answer in one click. If your carton is different, choose “Custom” and type in the exact energy value printed on the label and the density of the product.
The energy field must always be expressed per 100 ml. If your label lists a total for the whole bottle or per 200 ml, divide that number accordingly before entering it. The density field defaults to 1.04 g/ml, which suits most filtered juices; pulpy or sugar-rich juices may be slightly higher. Finally, enter an optional serving size in millilitres to see the calories in a typical glass or bottle.
Formula Explained
The core conversion is simple:
Calories per 100 g = (calories per 100 ml) ÷ density (g/ml)
Why does this work? Density tells you how many grams one millilitre weighs. So 100 ml of juice weighs 100 × density grams. Dividing the known calories by that total weight gives the energy in one gram, and multiplying by 100 scales it to a 100 g portion. If a juice has 46 kcal per 100 ml and a density of 1.04 g/ml, 100 g contains 46 ÷ 1.04 ≈ 44.2 kcal.
This also explains why per 100 g values are typically a few percent lower than per 100 ml values — the same energy is spread over slightly more grams than millilitres because juice is denser than water.
Worked Examples
Example 1 — Apple juice bottle: A 330 ml bottle lists 46 kcal per 100 ml and the juice has a density of 1.05 g/ml.
Per 100 g = 46 ÷ 1.05 = 43.8 kcal.
Serving = 46 × 330 ÷ 100 = 151.8 kcal per bottle.
Example 2 — Grape juice glass: Grape juice has about 62 kcal per 100 ml and a density near 1.06 g/ml.
Per 100 g = 62 ÷ 1.06 = 58.5 kcal.
A 250 ml glass = 62 × 250 ÷ 100 = 155 kcal.
If you log by weight, a 250 g glass = 58.5 × 250 ÷ 100 ≈ 146 kcal.
Reference Data: Typical Values
The table below combines common nutrition-label figures with typical juice densities. Actual brand values vary, especially with added sugar, pulp content and fruit variety.
| Juice type | Typical kcal / 100 ml | Typical density (g/ml) | Est. kcal / 100 g |
|---|---|---|---|
| Orange | 46 | 1.04 | 44.2 |
| Apple | 46 | 1.05 | 43.8 |
| Grape | 62 | 1.06 | 58.5 |
| Cranberry | 46 | 1.04 | 44.2 |
| Tomato | 19 | 1.03 | 18.4 |
| Pineapple | 53 | 1.05 | 50.5 |
| Pomegranate | 54 | 1.05 | 51.4 |
Tips & Common Mistakes
- Do not treat millilitres and grams as interchangeable. For juice the difference is usually 3–5%, which matters when tracking several glasses a day.
- Adjust density for thick juices. Freshly pressed juices with lots of pulp, or blends with banana or mango, can reach 1.06–1.10 g/ml. Entering a higher density lowers the per 100 g calorie value.
- Read the label for added sugar. Sweetened juice drinks can contain 60–90 kcal per 100 ml, far above the 19–62 kcal range of pure juices.
- When weighing a portion, multiply the food weight in grams by the per 100 g result and divide by 100. Do not use the per 100 ml number on a gram portion.
Precision Notes
Nutrition labels round calorie values, often to the nearest whole kilocalorie, so the converted result inherits that rounding. Density also changes slightly with temperature: cold juice is a bit denser than warm juice, though the effect is usually under 0.5%. The biggest source of error in practice is label rounding, not density uncertainty. For planning purposes, treating the result to one decimal place is more than adequate.
Frequently Asked Questions
Why do juice labels use per 100 ml instead of per 100 g? Most countries require liquid foods to declare nutrition information per 100 millilitres so shoppers can compare volumes across cartons and bottles. Weight-based tracking therefore usually needs a conversion like the one on this page.
Can I use this calculator for smoothies, milk or soft drinks? Yes. The math works for any beverage if you enter its calories per 100 ml and density. Smoothies tend to be denser (1.05–1.10 g/ml), and carbonated soft drinks are close to water. Just switch to “Custom” and enter the values from the label.
Where can I find official calorie data for juices? The USDA FoodData Central database is a reliable free source for energy and nutrient values. See fdc.nal.usda.gov for detailed entries by food and brand.