A comprehensive tool to assist individuals with diabetes in calculating precise mealtime insulin doses. This calculator considers carbohydrate intake, current blood glucose levels, and personalized settings like Insulin-to-Carb Ratio (ICR) and Insulin Sensitivity Factor (ISF). It clearly breaks down the dose into a carb bolus and a correction bolus, providing a total suggested dose. The tool supports both mg/dL and mmol/L units, stores all settings and a history of calculations in the browser for privacy and convenience, and includes a critical disclaimer about consulting healthcare professionals. All data remains on the user's device.