Honeydew melon is a refreshing, low-calorie fruit that fits neatly into weight-loss meals, fruit bowls, and summer snacks. But because slices vary from thin wedges to thick chunks, estimating calories by eye is easy to get wrong. This honeydew calories per slice calculator takes the guesswork out of portioning: enter how many slices you're eating, choose a slice size (thin, medium, thick, or custom), and get an instant calorie total, per-slice calories, and an optional macronutrient breakdown.
Built on USDA nutrition data, the calculator also works in grams and ounces, making it useful whether you're following a calorie-counting app, prepping fruit for the week, or just curious about what a honeydew snack costs you in energy. It's simple enough for everyday use and precise enough for diligent trackers.
How to Use This Tool
This calculator is built for quick portion checks and meal-prep planning. Start by entering the number of honeydew slices in your serving. Then choose a slice-size preset — thin, medium, or thick — or type a custom weight in the box. If you prefer to work in ounces, switch the unit dropdown from grams to ounces and the tool will convert the weight for you. The calculation is instant: you get the total calories for the whole serving plus the calories per individual slice. When the macro breakdown checkbox is selected, the result panel also shows carbohydrates, sugar, protein, and fiber for the whole portion, which is handy if you log more than just calories.
Because honeydew is a naturally high-water fruit, slice weights can vary wildly depending on how thick you cut and where you slice from in the melon. For the most reliable number, weigh a representative slice after cutting. If you already know the average slice weight, you can also use this tool to estimate the total calories for an entire melon by entering how many slices you got from it. For another fruit-portion reference, check the fruit calories per handful calculator.
The Math Behind the Calories
The calorie values come from the USDA FoodData Central listing for raw honeydew melon: approximately 36 calories per 100 grams. The tool uses this simple proportion:
Calories = (weight in grams × 36) ÷ 100
It also applies the same proportion to estimate macronutrients, using per-100-gram values of about 9.09 g carbohydrates, 8.12 g sugar, 0.54 g protein, and 0.8 g fiber. The actual values vary slightly by growing conditions and ripeness, but the difference is too small to matter for day-to-day tracking.
Typical Slice Sizes and Reference Values
Since there is no official definition for a 'slice' of honeydew, the table below shows common portion sizes and their approximate calorie content.
| Portion | Approx. weight | Calories |
|---|---|---|
| Thin slice | 50 g (1.8 oz) | 18 kcal |
| Medium slice | 85 g (3 oz) | 31 kcal |
| Thick slice | 125 g (4.4 oz) | 45 kcal |
| 1 cup diced | 177 g | 64 kcal |
| 100 g | 3.5 oz | 36 kcal |
If you usually eat honeydew in cubes or balls, 1 cup of diced honeydew is roughly 177 grams, so the 1-cup row in the table can be a useful reference even when you are slicing rather than dicing.
Worked Examples
Example 1: Two medium slices
Two slices at 85 g each = 170 g total. Calories = (170 × 36) ÷ 100 = 61 kcal. Carbs = (170 × 9.09) ÷ 100 = 15.5 g.
Example 2: One thick slice
A 125 g thick slice provides (125 × 36) ÷ 100 = 45 kcal, with about 10.2 g of sugar and 1 g of fiber.
Example 3: Mixing units
You weigh a slice and it comes to 3 oz. Convert to grams: 3 × 28.35 = 85 g. Then calories = (85 × 36) ÷ 100 = 31 kcal.
Factors Affecting Accuracy
Honeydew is one of the more variable fruits. Moisture content, ripeness, and growing region can shift the true calorie count by a few percent. The weight of a single slice is the dominant factor, so a food scale will always beat visual estimates. Also note that the 'rind weight' is not included in nutrition values: only the edible flesh counts. If you slice a melon and leave part of the flesh on the rind, your actual consumed calories will be slightly lower than the calculator's estimate.
Frequently Asked Questions
Is honeydew good for weight loss? Yes. Honeydew is low in calories and high in water, so it can help with satiety without adding many calories to your daily total. A medium slice is only around 30 kcal.
Does the macro breakdown change if the honeydew is overripe? Slightly. As fruit ripens, some starches convert to sugars, which can raise the sugar number a bit, but the calorie difference is usually under 5 percent.
Can I use this calculator for frozen honeydew? Yes, as long as you measure by weight. Frozen fruit contains the same calories per gram as fresh fruit, assuming no added syrup.
Where does the nutrition data come from? The tool uses USDA FoodData Central values for raw honeydew melon. You can also view the official entry by searching 'Melon, honeydew, raw' on the USDA FoodData Central website. For more detailed carbohydrate tracking, see the honeydew carbs calculator.