This calculator converts any weight of fruit into calories on a per-gram basis, making it easy to compare energy density and log servings without guessing. Choose a fruit from the list, enter the number of grams, and the tool automatically applies the correct calorie-per-100g value. You can also use the custom fruit option if you have a nutrition label or a different variety in mind.
Per-gram figures are useful because fruit weights vary widely. A medium apple might weigh 180 g, while a sliced-cup portion might be closer to 110 g. Using grams removes the guesswork and helps you track consistently in apps, meal plans, or simple food journals. Students, dietitians, athletes, and anyone managing a calorie budget will find this helpful for portion control.
The calculator also shows calories per gram and how a serving fits into a standard 2,000-kcal daily target. For the most accurate results, weigh fruit with a kitchen scale and use the ripeness-adjusted values from your label whenever possible.
Auto-filled from the fruit list, but editable for custom fruit or specific brands.
How the Per-Gram Calculation Works
For any food, energy density is usually expressed as calories per 100 grams. To find the calories in the amount you actually ate, multiply the weight in grams by the food's calorie-per-100-g value, then divide by 100. The same result also gives you the per-gram value when you divide total calories by total grams. Per-gram energy density is a compact way to compare fruits: bananas deliver about 0.89 kcal per gram, while strawberries deliver only about 0.32 kcal per gram. This is why a bowl of berries can be more filling for the same calorie cost as a banana.
The calorie values in this calculator come from standard USDA FoodData Central entries for raw, edible fruit. You can look up the latest database values at USDA FoodData Central.
Reference Table: Calories in Common Fruits
Use these figures for quick meal planning and portion checks. All values are for raw fruit, edible portion, from USDA FoodData Central.
| Fruit | kcal per 100 g | Typical serving | Calories per serving |
|---|---|---|---|
| Apple | 52 | 1 medium (182 g) | ≈95 |
| Banana | 89 | 1 medium (118 g) | ≈105 |
| Orange | 47 | 1 medium (131 g) | ≈62 |
| Strawberries | 32 | 1 cup whole (144 g) | ≈46 |
| Grapes | 69 | 1 cup (151 g) | ≈104 |
| Watermelon | 30 | 1 cup diced (152 g) | ≈46 |
| Blueberries | 57 | 1 cup (148 g) | ≈84 |
| Pineapple | 50 | 1 cup chunks (165 g) | ≈83 |
| Mango | 60 | 1 cup pieces (165 g) | ≈99 |
| Peach | 39 | 1 medium (150 g) | ≈59 |
| Pear | 57 | 1 medium (178 g) | ≈101 |
| Cherries | 63 | 1 cup without pits (138 g) | ≈87 |
Serving sizes are estimates because actual fruit weights vary by variety and growing conditions. For calorie-dense fruits such as avocado, a dedicated tool can be more useful: try this avocado calorie calculator. If you eat a lot of berries, this blackberry serving calculator covers another common option.
Worked Examples
Example 1: A 120 g banana at 89 kcal/100 g gives (120 × 89) ÷ 100 = 106.8 kcal, or about 0.89 kcal/g.
Example 2: A 90 g bowl of blueberries at 57 kcal/100 g gives (90 × 57) ÷ 100 = 51.3 kcal, or about 0.57 kcal/g.
Example 3: A 200 g slice of watermelon at 30 kcal/100 g gives (200 × 30) ÷ 100 = 60 kcal, or 0.30 kcal/g. You can eat a generous portion of watermelon for very few calories.
Tips for Accurate Tracking
- Weigh the edible part. Remove the peel, core, pits, and stems before weighing because the calorie value refers to what you actually eat.
- Use grams, not cups. A cup of sliced fruit packs differently depending on how coarsely or finely you cut it; a kitchen scale eliminates that error.
- Check the label for dried or frozen fruit. Dried fruit can have 250–350 kcal per 100 g because water is removed, so the same gram weight is far more calorie-dense. Frozen fruit usually matches raw values but may contain added sugar.
- Adjust for ripeness and variety. A very sweet, ripe mango may be slightly higher in sugar than an under-ripe one, and varieties differ. The built-in list gives reliable averages.
- Log immediately. Enter your portion while the scale is still showing the weight so you do not have to remember it later.
Limitations & Precision Notes
This calculator is designed for whole, raw, fresh fruit. Processed forms can be very different: canned fruit in syrup absorbs added sugar, dried fruit loses water, and fruit juices are usually higher in calories per 100 ml than the whole fruit. The calorie values are also averages from food-composition databases; a specific piece of fruit can vary by 5–10% depending on cultivar, climate, storage time, and how it was grown.
If you are tracking for medical reasons, a registered dietitian can help you interpret the numbers in the context of your full diet. Calorie information is an estimate, not a precise chemical measurement of every individual fruit.
Frequently Asked Questions
Why does per-gram calorie density matter? It helps you compare portions fairly. Water-rich fruits like watermelon and strawberries are low per gram, so they add volume and hydration for fewer calories. Starchy or sugary fruits like bananas and grapes are more energy-dense, which matters when you are trying to stay within a calorie target.
How do I use the custom fruit option? Pick a fruit from the list, note its value, then switch to Custom fruit and overwrite the numbers if your label or brand gives a different figure. You can also use it for fruits that are not in the list, such as kiwi, papaya, or lychee, as long as you know the kcal per 100 g.
Is fruit calorie counting necessary for everyone? No. For most people, eating a variety of whole fruits is more important than tracking every gram. But if you are on a structured meal plan, managing diabetes, or trying to lose weight, knowing the energy density of fruit can prevent portion creep.
Can I use this for dried fruit? Yes, if you enter the dried fruit's own kcal/100 g value from the package. Do not use the fresh fruit value, because dried fruit is much lighter and more calorie-dense.