Wondering how many calories are in a few slices of guava? This calculator converts your sliced portion into calories plus the full macronutrient picture — carbohydrates, sugars, fiber, protein, and fat — using USDA nutrition data for raw guava (68 kcal per 100 g). It even estimates vitamin C, one of the fruit’s standout nutrients.
Use it for meal prep, fruit bowls, snack tracking, or portion planning. Enter the number of slices, pick a slice size in grams or ounces (use the quick-fill presets for thin, medium, or thick cuts), and hit Calculate. The results show both per-slice and total values so you can scale servings confidently.
Whether you’re counting calories, managing diabetes, or simply curious about this tropical fruit, this tool gives you a fast, reliable estimate based on standard food-composition data.
🍈 Portion Details
📊 Estimated Nutrition
How to Use This Tool
Fresh guava is usually eaten with the skin, so the nutrition figures here apply to the whole fruit. Start by entering the number of slices you plan to eat. Then set the average weight of one slice — a thin slice of a medium guava weighs roughly 15 g, a medium slice about 25 g, and a thick slice about 40 g. Use the preset buttons or type your own value. If you prefer to weigh in ounces, switch the unit dropdown and the calculator converts for you.
- Enter the number of whole slices.
- Choose grams or ounces for the slice weight.
- Type a slice weight or tap a quick-fill preset.
- Press Calculate Calories.
Press Reset to clear everything, or Copy Results to save a quick text summary. If you regularly track other fruits, you can apply the same portion-based approach with our fruit calorie calculator.
The Math Behind It
All values are based on USDA FoodData Central entries for raw common guava. Per 100 grams, raw guava supplies about 68 kcal, 14.32 g carbohydrates, 8.92 g sugars, 5.4 g dietary fiber, 2.55 g protein, 0.95 g fat, and 228.3 mg vitamin C. These figures are averages, and individual fruit will vary a little with variety, ripeness, and growing conditions.
To estimate your portion, the calculator first converts your slice size to grams if needed, then multiplies by the slice count to get the total weight. It then applies the factor total weight ÷ 100 to each nutrient. Calories, for example, equal (total weight ÷ 100) × 68. This linear scaling is appropriate for fresh fruit because food-composition databases report averages per 100 g, and most people eat guava in servings well under a full kilogram.
Vitamin C is also reported as a percentage of the Daily Value, using 90 mg per day as the reference amount set by the FDA. For one average 25 g slice, vitamin C comes to about 57 mg, which is about 63 percent of a typical adult daily need. That is why guava is often highlighted when people talk about vitamin C-rich fruit.
Formula used: kcal per slice or portion = (grams of guava ÷ 100) × 68. The same calculation applies to each macronutrient using the per-100 g values in the reference table below.
Worked Examples
Example 1: Three medium slices at 25 g each. Total weight = 75 g. Nutrition factor = 0.75. Calories = 68 × 0.75 = 51 kcal. Protein = 2.55 × 0.75 = 1.9 g. Vitamin C = 228.3 × 0.75 = 171 mg, about 190 percent of the Daily Value. This is a light, nutrient-dense topping for yogurt, oats, or a cottage cheese bowl.
Example 2: Six thin slices at 15 g each. Total weight = 90 g. Nutrition factor = 0.90. Calories = 68 × 0.90 = 61 kcal. Carbohydrates = 14.32 × 0.90 = 12.9 g. Sugars = 8.92 × 0.90 = 8.0 g. Fiber = 5.4 × 0.90 = 4.9 g. That makes a generous snack with about 61 kcal and nearly 5 g of fiber.
Reference Data
The table below lists the average values used by the calculator.
| Nutrient | Per 100 g | Per 25 g slice |
|---|---|---|
| Calories | 68 kcal | 17 kcal |
| Carbohydrates | 14.32 g | 3.6 g |
| Sugars | 8.92 g | 2.2 g |
| Dietary fiber | 5.4 g | 1.4 g |
| Protein | 2.55 g | 0.6 g |
| Fat | 0.95 g | 0.2 g |
| Vitamin C | 228.3 mg | 57.1 mg |
| Water | 80.8 g | 20.2 g |
Common Mistakes to Avoid
- Assuming every slice weighs the same. Slice thickness and fruit size vary, so if you are tracking strictly, weigh a few slices and use the average.
- Confusing ounces with grams. A 1 oz slice is actually 28.35 g. Entering 1 in the grams field when you meant ounces would under-report the portion by a factor of 28.
- Using guava nectar or guava paste. These processed products often contain added sugar and are much more calorie-dense than fresh fruit. This calculator is for raw guava only.
- Forgetting that the peel is included. Guava skin is edible and included in the 68 kcal per 100 g figure. Peeling changes the numbers slightly but not in a predictable way, so weigh the fruit as you actually eat it.
Frequently Asked Questions
Is the vitamin C estimate accurate? Raw guava is exceptionally high in vitamin C. The 228.3 mg per 100 g value comes from USDA data, but actual content varies by variety, ripeness, and storage. Slicing and exposure to air can reduce vitamin C over time, so eat guava soon after cutting for the best nutrient retention. For detailed intake guidance, see the NIH Office of Dietary Supplements vitamin C fact sheet.
Can I use this for frozen guava? Unsweetened frozen guava is usually close to the fresh fruit in calories, but syrup-packed frozen fruit is higher in sugar. Check the package label and use that number if it is provided.
Why does a serving of guava have so many carbohydrates? Guava is a fruit, so naturally occurring sugars and plant carbohydrates make up most of its weight besides water. Its fiber content, about 5.4 g per 100 g, helps slow digestion and lowers net carbs to roughly 8.9 g per 100 g, which can fit into many balanced eating patterns.
How does guava compare with other fruits? At about 68 kcal per 100 g, guava sits in a moderate range for calories, similar to many berries and citrus fruits, but it stands out for vitamin C and fiber. If you want to compare portions across several fruits, the fruit calorie calculator is a handy companion.