Glycemic Load Calculator
GL from glycemic index and carbs per serving
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Glycemic Load Calculator turns the numbers behind GL from glycemic index and carbs per serving into a result, step by step. You supply Glycemic Index (0-100) and Carbs per Serving (g) to Glycemic Load; the answer follows at once. Nothing in Glycemic Load is a black box. Glycemic Load shines when speed matters. Nothing is uploaded while Glycemic Load works, and the figures stay put. Glycemic Load handles glycemic load calculator glycemic index carbs per serving the same way as related figures — one of the Health tools on CalcProMaster. Glycemic Load is great for comparing scenarios. Change one value and watch. Open Glycemic Load and enter your numbers.
What the defaults give
A glycemic index of 65 with 30 g of carbohydrate per serving gives a glycemic load of 19.5, which is moderate.
Under 10 is low, 11–19 is moderate, and 20 or more is high.
The formula
Glycemic load = glycemic index × carbohydrate grams ÷ 100
65 × 30 ÷ 100 = 19.5.
Worked examples
GI 65, 30 g carbs → GL 19.5 (moderate)
GI 65, 15 g carbs → GL 9.8 (low) — half the portion, half the load
GI 72, 40 g carbs → GL 28.8 (high)
GI 40, 25 g carbs → GL 10.0 (low)
Why load beats index on its own
The glycemic index rates a fixed 50 g of available carbohydrate, which is rarely the portion on your plate. Watermelon has a high index and very little carbohydrate per slice, so its load is modest; a white baguette has a high index and a lot of carbohydrate, so its load is high. Load is the number that reflects what you actually eat, which is why it is the more useful planning figure.
What the number does not capture
- Food combinations. Fat, protein and fibre eaten alongside slow gastric emptying and lower the real response.
- Individual variation. The same food produces different curves in different people, sometimes dramatically.
- Cooking and ripeness. Both change the starch structure and the index for the same food.
- Total diet. One moderate-load meal inside an otherwise balanced day is not a problem; the pattern is what matters.
Use load to compare portions of the same food, and treat the thresholds as guidelines rather than medical limits. Anyone managing diabetes should follow the plan agreed with their clinician.
Portion is doing most of the work here. A high-GI food eaten in a small amount can carry a lower load than a moderate-GI food eaten in bulk — 30 g of carbohydrate at GI 65 gives 19.5, while 60 g at GI 55 gives 33. The thresholds of 10 and 20 are per serving, so a meal combining several moderate items can pass 20 without any single food being high. Pairing with protein, fat and fibre slows absorption and lowers the effective response.
Frequently Asked Questions
What is a glycemic load of 19.5?
Moderate. Loads up to 10 are low, 11–19 are moderate, and 20 or above are high.
How is glycemic load different from glycemic index?
The index rates 50 g of carbohydrate in isolation; the load multiplies it by the carbohydrate actually in your portion, so portion size counts.
Does cutting the portion halve the load?
Yes, proportionally. Half the carbohydrate grams gives half the load, even though the index of the food is unchanged.
Can a high-index food have a low load?
Yes. Watermelon and carrots are the standard examples: high index, low carbohydrate per serving, therefore low load.
Does the load change when I eat protein with it?
Yes. Fat, protein and fibre slow digestion and flatten the glucose response, which the load formula does not model.
Should I aim for a low-load diet?
For general health, moderating the overall load is reasonable. For diabetes management, follow the individual targets set by your care team.
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