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Basal Bolus Insulin Split Calculator

Work out basal bolus insulin split instantly with clear inputs, formula shown and shareable results.

About Basal Bolus Insulin Split Calculator

Splits a total daily insulin dose into basal and mealtime components and divides the mealtime share across the day's meals.

Formula

Basal-bolus split

Basal = TDD x basal share; bolus total = TDD - basal; per meal = bolus total / number of meals

Worked example

With the default values below, Basal Bolus Insulin Split Calculator returns Basal insulin per day of 25.0. Change any input above and every figure here is recalculated in your browser.

Inputs used

Total daily insulin doseaccepts 5–300 units
50 units
Basal share of the totalaccepts 20–80 %
50 %
Meals covered per dayaccepts 1–6
3

Results

Basal insulin per day
25.0 units
Total mealtime insulin per day
25.0 units
Mealtime insulin per meal
8.3 units

Step by step

  1. 1Values used
  2. 2Basal-bolus split
  3. 3Basal insulin per day= 25.0 units
  4. 4Total mealtime insulin per day= 25.0 units
  5. 5Mealtime insulin per meal= 8.3 units

Assumptions and limits

  • The result is derived only from the 3 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 1 decimal place, 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

What split is commonly used?

A 50:50 basal to bolus split is the usual starting point, adjusted from glucose patterns.

Are meal doses always equal?

No. Equal division is only a starting estimate; carbohydrate content and time of day change the requirement.

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