Free · Food carbohydrate measurements

Glycemic Load per Serving

Combine a tested glycemic index and available carbohydrate grams to estimate a serving’s glycemic load.

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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Use the result with context

Health results are educational estimates, not a diagnosis or treatment recommendation. A qualified clinician can interpret measurements in the context of your health.

Formula and method

GI 38 and 15 g available carbohydrate give GL 5.7.

GL = glucose-reference glycemic index × available carbohydrate grams per serving / 100.

Worked example

Enter these known values and leave the other values blank.

Glycemic index
38
Carbs in the portion
15 g
Glycemic load
5.7

Assumptions and limitations

  • Use available carbohydrate for the serving rather than food mass. In North America, total carbohydrate generally includes fiber, which must be excluded when estimating available carbohydrate; labeling conventions vary.
  • GI is a relative tested glucose response. It may exceed 100; the Sydney database lists tested jasmine rice GI 109. Use a glucose-reference GI, not an unconverted white-bread-reference value.
  • The captured inverse model accepts positive GI and positive carbohydrate. Zero carbohydrate or zero GI gives zero forward load mathematically, but cannot identify a unique inverse; those cases remain outside this captured invertible control model.

Common questions

Can GI be above 100?

Yes. Glucose is the reference value of 100, not an absolute ceiling on measured response. The Sydney GI database includes values above 100.

Does GL tell me my glucose rise?

No. It combines measured population GI with serving carbohydrate; preparation and individual response vary.

References

Allow positive measured glycemic indices above 100: glucose-reference GI is a response ratio, not a percentage bounded at 100; the primary Sydney database includes GI 109 jasmine rice. Require positive available carbohydrate and index for the captured invertible model.

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