The Lantus Dosing Calculator is a free online clinical reference tool for estimating insulin glargine (Lantus) doses for adults with Type 1 or Type 2 diabetes. It offers weight-based starting-dose calculations for people beginning basal insulin and treat-to-target guidance for those adjusting an existing dose using fasting blood glucose readings. Users enter details such as diabetes type, weight, insulin status, and glucose level to receive a recommended daily dose, an explanation of the calculation, and safety checks.

The tool describes its methods as aligned with the ADA Standards of Care 2026 and Endocrine Society insulin titration guidance, with a three-day interval between adjustments reflecting the INSIGHT protocol. It also flags potential concerns, including hypoglycemia risk, glucose readings outside clinical ranges, and doses above 40 units. Designed for clinicians, diabetes educators, patients, and caregivers, the calculator presents dosing information in clear, step-by-step language. It is an educational aid, not a substitute for medical advice; users should confirm all dose changes with a licensed prescriber.