Most people think of hydration as water, tea, and sports drinks — but fruit is one of the best hydrating foods you can eat. Watermelon, strawberries, cantaloupe, and even apples contain 75–92% water by weight, and that moisture counts toward your daily fluid needs. This Hydration from Fruit Calculator shows exactly how much water you get from a given serving of fruit, in milliliters, fluid ounces, and cups.
Use it to plan snacks, build hydration-friendly meal prep, or compare fruits side by side. Enter a fruit, choose grams, ounces, or cups, and optionally add a daily hydration target to see what percentage that portion contributes. The tool also provides a step-by-step breakdown so you can understand the math behind each result.
Whether you're an athlete tracking fluids, a dietitian planning menus, or just someone trying to drink more water, this calculator makes it easy to see the hidden water in your fruit bowl.
🥤 Fruit Hydration Calculator
See how much of your fruit serving is water and what it contributes to your daily fluid goal.
How the Water Content Is Calculated
Fruit water content is expressed as grams of water per 100 grams of edible fruit. The calculator first converts your chosen serving size to grams, then multiplies by the fruit's water percentage. For example, if watermelon is 91.5% water and you eat 200 g, the water contribution is 200 × 0.915 = 183 mL (about 6.2 fl oz). Since 1 g of water occupies about 1 mL at room temperature, the water weight in grams is reported directly as milliliters.
The water percentages and cup weights used here are based on entries in the USDA FoodData Central database. Cup values represent raw, edible portions as typically chopped, sliced, or diced, so slight variation is normal depending on fruit size, ripeness, and how finely it is cut.
Reference Table: Water Content of Common Fruits
| Fruit | Water % | Approx. grams per 1 cup |
|---|---|---|
| Watermelon | 91.5% | 154 g |
| Strawberries | 91.0% | 152 g |
| Cantaloupe | 90.2% | 160 g |
| Peach | 88.9% | 154 g |
| Orange | 86.1% | 165 g |
| Apple | 85.6% | 125 g |
| Blueberries | 84.2% | 148 g |
| Grapes | 80.5% | 151 g |
| Banana | 74.9% | 150 g |
| Avocado | 73.2% | 146 g |
Values are approximate and based on raw fruit. Check the USDA FoodData Central entry for the specific variety and preparation method you are using.
Worked Examples
Example 1: A medium orange
Assume a medium orange has about 131 g of edible flesh and an average water content of 86%. The calculation is 131 × 0.86 = 112.7 mL of water, or roughly 3.8 fl oz. That is a little less than half a cup of water.
Example 2: One cup of sliced strawberries
One cup of sliced strawberries weighs about 152 g. At 91% water, that serving provides 152 × 0.91 = 138.3 mL, or about 4.7 fl oz. Two cups would give approximately 277 mL, close to a standard 8 oz glass of water.
Example 3: A medium banana
A medium banana (about 118 g edible portion) is around 75% water, so it contributes about 88.5 mL. Bananas are less hydrating than melons or berries, but they still add fluid along with potassium and carbohydrates.
Tips for Using Fruit Hydration in Your Day
- Choose whole or cut fruit over dried versions. Drying removes most of the water; raisins are only about 15% water, while dates are about 20% and dried apricots about 31%.
- Pair high-water fruit with a protein source. Apple slices with nut butter or watermelon with cottage cheese can make a more satiating snack while still adding fluid.
- Use the percentage view. Setting a daily hydration target shows how a serving fits into your overall plan. A 200 g serving of watermelon can cover over 12% of a 1.5 L target.
- Think about energy density. High-water fruits like watermelon, strawberries, and cantaloupe provide more volume for relatively few calories, which can be helpful when managing weight.
Frequently Asked Questions
Does the water in fruit really count toward daily hydration?
Yes. The National Academy of Medicine's dietary reference intakes for water include water from beverages and foods, and typical food moisture is estimated to contribute roughly 20% of total intake. See the dietary reference intakes report for details.
Why does my fruit nutrition label show a different water percentage?
Variety, ripeness, storage conditions, and growing region all influence moisture content. The values in this calculator are reasonable averages from USDA data, not exact values for a specific fruit in your kitchen.
Can I use this calculator for blended fruit or smoothies?
Whole blended fruit will have roughly the same water content as the raw fruit you start with, though adding ice or milk will change the total. Use the calculator for the fruit portion, then add your other ingredients separately.
What about fruit juice?
Juice is mostly water, but it lacks most of the fiber and is much easier to overconsume. The calculator is designed for whole or cut fruit servings, so use it as a hydration and portion tool rather than a juice calculator.
You can learn more about healthy drink choices on the CDC's water and healthier drinks page.