The Two Bolus Components

This insulin-to-carb ratio calculator models mealtime dosing as two parts: a carbohydrate bolus (carbs ÷ ICR) that covers the meal, plus a correction bolus ((glucose − target) ÷ sensitivity factor) that brings high blood sugar back to range. The total is what most pumps and pens deliver before a meal.

Why Ratios Are Personal

ICR and sensitivity vary with body weight, insulin resistance, activity, and even time of day. Morning meals often need tighter ratios than lunch. Your care team establishes the baseline; tracking post-meal glucose refines it over weeks.

Safety First

This is arithmetic, not a prescription. Hypoglycemia risk rises when correction stacks with active insulin, so always confirm timing and units with your provider and glucose monitor before dosing.