Diabetic Meal Carb Count Calculator

Work out diabetic meal carb count instantly with clear inputs, formula shown and shareable results.

About Diabetic Meal Carb Count Calculator

Applies the chosen fibre adjustment rule to give net carbohydrate, then converts it into carbohydrate choices and mealtime insulin units.

Formula

Carbohydrate counting

Net carbohydrate = total carbohydrate - fibre deduction; one carbohydrate choice is 15 g; insulin units = net carbohydrate / insulin to carbohydrate ratio

Worked example

With the default values below, Diabetic Meal Carb Count Calculator returns Mealtime insulin for the carbohydrate of 5.85. Change any input above and every figure here is recalculated in your browser.

Inputs used

Total carbohydrate in the mealaccepts 0–300 g: 60 g
Fibreaccepts 0–60 g: 8 g
Insulin to carbohydrate ratioaccepts 1–50 g per unit: 10 g per unit
Fibre adjustmentone of Subtract all fibre, Subtract half of fibre above 5 g, No adjustment: Subtract half of fibre above 5 g

Results

Mealtime insulin for the carbohydrate: 5.85 units
Net carbohydrate counted: 58.50 g
Carbohydrate choices at 15 g each: 3.90
Fibre deducted: 1.50 g

Step by step

1Values used
2Carbohydrate counting
3Mealtime insulin for the carbohydrate= 5.85 units
4Net carbohydrate counted= 58.50 g
5Carbohydrate choices at 15 g each= 3.90
6Fibre deducted= 1.50 g

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

Frequently Asked Questions

Which fibre rule is standard?

Practices differ; many centres subtract half the fibre only when it exceeds 5 g per serving.

Do sugar alcohols count?

Typically half their carbohydrate is counted, since they are incompletely absorbed.