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Nutrition & nutritional science

Meal glycemic index calculator

Meal glycemic index calculator: This is a mathematical estimate from GI and available carbohydrate.

Your result

Complete the fields and calculate.

Calculation method and formula

(GI food 1 × Carbs 1 [g] + GI food 2 × Carbs 2 [g] + GI food 3 × Carbs 3 [g]) ÷ (Carbs 1 [g] + Carbs 2 [g] + Carbs 3 [g])

Understand the inputs

GI food 1
Minimum 0. Maximum 100. Use a measured value or your own assumption.
Carbs 1
Unit: g. Minimum 0. Use a measured value or your own assumption.
GI food 2
Minimum 0. Maximum 100. Use a measured value or your own assumption.
Carbs 2
Unit: g. Minimum 0. Use a measured value or your own assumption.
GI food 3
Minimum 0. Maximum 100. Use a measured value or your own assumption.
Carbs 3
Unit: g. Minimum 0. Use a measured value or your own assumption.

Assumptions and limitations

This is a mathematical estimate from GI and available carbohydrate. It does not reliably predict effects of preparation, mixed meals or personal glucose responses.

The formula uses the specified units. Displayed numbers are rounded; whole packs, item counts and full time periods may also be rounded within the calculation.

Worked example

Illustrative values. Replace them with your own inputs for your calculation.

GI food 1
55
Carbs 1
30 g
GI food 2
35
Carbs 2
20 g
GI food 3
15
Carbs 3
10 g
Example result41.7 GI

Carbohydrate-weighted mean of the foods entered.

Model revision: October 17, 2026 · How CleverCalc works

FAQ

Frequently asked questions

How does Meal glycemic index calculator work?+

(GI food 1 × Carbs 1 [g] + GI food 2 × Carbs 2 [g] + GI food 3 × Carbs 3 [g]) ÷ (Carbs 1 [g] + Carbs 2 [g] + Carbs 3 [g]). This is a mathematical estimate from GI and available carbohydrate. It does not reliably predict effects of preparation, mixed meals or personal glucose responses.

What assumptions should I consider for this result?+

This is a mathematical estimate from GI and available carbohydrate. It does not reliably predict effects of preparation, mixed meals or personal glucose responses. The formula uses the specified units. Displayed numbers are rounded; whole packs, item counts and full time periods may also be rounded within the calculation.

How accurate is the result?+

The formula uses the specified units. Displayed numbers are rounded; whole packs, item counts and full time periods may also be rounded within the calculation. Health values are general information, not a diagnosis or personal treatment recommendation.

Is this calculator free?+

Yes. Calculations and PDF export work without an account or registration.

What happens to my inputs?+

Calculations run in your browser. Results are saved locally only when you add them to My results; favourites and history are also local. Shared links contain your values. The currency tool requests the selected currencies from its rate provider without sending your amount.

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