Peaches are one of summer's most popular fruits, but their natural sugar content can be confusing when you are managing blood sugar or planning a low-glycemic diet. Unlike glycemic index alone, glycemic load takes serving size into account, so it gives a more realistic picture of how a peach serving affects glucose response. This free calculator puts that information at your fingertips.
Using just a few inputs — serving amount, peach type, and standard carbohydrate and fiber values — you can estimate net carbs and glycemic load in seconds. The tool includes quick presets for common servings, editable nutrition fields, and a step-by-step breakdown so you always know how the result was calculated.
Whether you are a person with diabetes, a dietitian, or simply someone curious about healthy eating, this peach GL calculator helps you portion peaches with confidence. Use it alongside your favorite nutrition tracking app or meal plan.
🍑 Peach Glycemic Load Calculator
Estimate the glycemic load of your peach serving.
How to Use This Tool
Start by entering the amount of peach you plan to eat and choosing the matching unit. If you weigh your fruit, choose grams or ounces. If you are estimating, the presets for one medium peach, one large peach, and one cup of sliced peaches are quick starting points. Next, select the peach form that best matches your food. The default choice is raw ripe peach with a glycemic index near 42. Check the box for a custom GI if you have a measured value from a glucose meter or a CGM, and type it in manually. Finally, confirm the carbohydrate and fiber values per 100 g. The defaults are based on typical raw peach nutrition, but you can update them with package data or your own tracking app.
How the Calculation Works
Glycemic load is the standard way to combine carbohydrate quantity with carbohydrate quality. The formula is:
Net carbs are used in the numerator because fiber is not digested into glucose in meaningful amounts. Total carbohydrate is first converted to a serving-based gram amount using the weight you entered, then fiber is subtracted. For a raw peach, total carbs are about 9.5 g per 100 g and fiber is about 1.5 g per 100 g, leaving about 8 g of net carbs per 100 g. Multiplying net carbs by the food's GI and dividing by 100 scales the glucose response to the actual portion.
This is important because the GI alone only describes a fixed amount of available carbohydrate. A peach may have a moderate GI, but a normal peach serving has a small amount of carbs, so its GL often falls in the low range. That is the key insight this calculator is designed to show.
Worked Examples
Example 1: One medium raw peach (150 g) — With total carbs 9.5 g/100 g and fiber 1.5 g/100 g, the peach provides 14.3 g total carbs and 2.3 g fiber, or 12.0 g net carbs. At GI 42, GL = 12.0 × 42 ÷ 100 ≈ 5.0, which is low.
Example 2: Two large peaches (350 g) — Total carbs ≈ 33.3 g, fiber ≈ 5.3 g, net carbs ≈ 28.0 g. GL = 28.0 × 42 ÷ 100 ≈ 11.8, which falls in the medium range. This shows why serving size matters.
Example 3: 100 g of peach — Net carbs ≈ 8.0 g and GL ≈ 3.4, a very light snack.
Quick Reference Table
The estimates below assume raw ripe peach with GI 42 and net carbs of 8 g per 100 g. Your numbers may vary with ripeness, variety, and produce source.
| Serving | Net carbs (g) | Glycemic load |
|---|---|---|
| 100 g (about 2/3 small peach) | 8.0 | 3.4 |
| 1 medium peach (150 g) | 12.0 | 5.0 |
| 1 cup sliced (154 g) | 12.3 | 5.2 |
| 1 large peach (175 g) | 14.0 | 5.9 |
| 2 medium peaches (300 g) | 24.0 | 10.1 |
You can verify raw peach nutrient data in the USDA FoodData Central database.
Tips & Best Practices
- Weigh fresh peaches before eating. A medium peach can range from 130 to 170 g, so using the exact weight improves accuracy.
- Choose firmer, less ripe fruit if you want a slightly lower glycemic response. Ripeness raises both sugar content and GI estimates.
- For canned peaches, read the label and update the carbohydrate and fiber fields. Fruit packed in syrup can have dramatically more sugar than fruit packed in water or juice.
- Pair peaches with a source of protein or fat, such as Greek yogurt or nuts, to slow glucose absorption and make the snack more satiating.
- Use GL as a guide, not a medical prescription. Individual glucose responses still vary based on metabolism, meal composition, and other factors.
Frequently Asked Questions
What is the difference between GI and GL? GI ranks carbohydrates on a scale from 0 to 100 by how quickly they raise blood sugar, but it ignores portion size. GL multiplies the GI by the actual grams of net carbohydrate in a serving, making it a far better estimate of real-world impact.
Are peaches a low glycemic load food? In normal single-fruit servings, yes. A medium raw peach has a GL of roughly 5, well below the low threshold of 10. Even a large peach stays near 6. Eating several large peaches or syrup-packed canned peaches can push the GL into the medium range.
Should people with diabetes avoid peaches? Not necessarily. Many people with diabetes can enjoy peaches in controlled portions because the fruit provides fiber, vitamins, and antioxidants. Monitoring your own glucose response is the most reliable approach. If you track other produce, the broccoli glycemic load calculator is another useful comparison tool.
Why do I subtract fiber? Fiber passes through your digestive tract largely undigested, so it contributes far fewer absorbable carbohydrates than sugars and starches. Net carbs approximates the carbohydrate that actually affects blood sugar.