Insulin Starting Dose Calculator
Medically reviewed by Dr. Chhaya Makhija, MD, DipABLM — October 2026
Conservative starting dose estimates for insulin-naïve patients, using ADA and AACE-referenced protocols. For educational purposes only — always start insulin under medical supervision.
🆕 Starting Dose Calculator
Starting Dose Estimates
(10 u/day basal)
units/day basal
(lower of the two)
to fasting BG target
How to Use the Insulin Starting Dose Calculator
Enter Weight
Input body weight in kg or lbs. The weight-based calculation uses 0.1–0.2 u/kg depending on patient type.
Choose Patient Type
Different starting protocols apply: insulin-naïve Type 2 is most conservative. Type 1 uses a higher starting factor.
See Both Estimates
Results show the fixed 10-unit protocol and the weight-based estimate side by side, with the lower (safer) start highlighted.
Understand Titration
Starting dose is not the maintenance dose. Dose is typically increased by 2 units every 3 days until fasting targets are met.
Discuss With Your Team
Bring this estimate to your prescriber. They will determine the actual starting dose, insulin type, and titration schedule.
Never Self-Initiate
Starting insulin without medical supervision is dangerous. This tool helps you understand the process — not bypass it.
Starting Insulin: What the Guidelines Say
When Type 2 diabetes can no longer be adequately managed with oral medications alone, insulin therapy is initiated. The goal of a conservative starting dose is to begin reducing hyperglycemia while minimising the risk of hypoglycemia in a patient new to insulin.
ADA / AACE Recommended Starting Protocol (Type 2 Insulin-Naïve)
Titrate: increase by 2 units every 3 days (or 10–15% per week) until fasting BG is consistently 80–130 mg/dL (4.4–7.2 mmol/L). Source: ADA Standards of Care 2026, Section 9; AACE Algorithm 2020.
Type 1 — New Adult Diagnosis
Type 1 requires full insulin replacement from diagnosis. The starting dose is typically 0.4–0.5 u/kg — the conservative end of the 0.4–1.0 u/kg/day adults may need — adjusted rapidly in the first weeks based on blood glucose monitoring. Some protocols start lower during the "honeymoon phase" of residual beta-cell function.
Why Start Low?
Hypoglycemia is the primary risk of insulin therapy, especially at initiation. A patient new to insulin may be unfamiliar with symptoms, treatment, and prevention. Starting conservatively and titrating up is far safer than starting at a maintenance dose estimate that may be too high. The 10-unit fixed start is the standard ADA recommendation for most insulin-naïve Type 2 adults, chosen for its low hypoglycemia risk while titration finds the true requirement.
Starting insulin without diabetes education — including training on hypoglycemia recognition, treatment (e.g., glucagon), and blood glucose monitoring — significantly increases risk. All patients starting insulin should receive formal diabetes self-management education (DSME) from a CDCES.
Fixed or weight-based, a starting dose is only the first adjustment of many, and the whole library of insulin tools follows the journey through titration.
Sources & References
- American Diabetes Association. Standards of Care in Diabetes — 2026. Section 9. Link
- AACE/ACE. Type 2 Diabetes Management Algorithm 2020. Link
- Davies MJ et al. "Management of Hyperglycemia in Type 2 Diabetes, 2018. A Consensus Report by ADA/EASD." Diabetes Care. 2018;41(12):2669–2701.
Written by Ryan Mitchell · Last updated: October 2026
From the starting dose to the working dose
The starting figure is an opening position. Fasting glucose decides what happens next, and the adjustment follows a steady rhythm rather than a daily reaction.
| Fasting glucose | Typical action | How often |
|---|---|---|
| Consistently above target | Raise basal by about 2 units | Every 3 days |
| Within target | Hold the dose | Review weekly |
| Below target, or any hypoglycemia | Reduce by 10–20% | Immediately, then reassess |
This pattern follows ADA guidance for outpatient basal titration. Three days lets a change settle, because a single high reading reflects yesterday as much as the dose.
Expect two to six weeks before the dose stabilises, and expect the final number to differ from the formula. Landing away from the calculated estimate is the normal outcome rather than a sign the estimate failed.
Frequently Asked Questions: Insulin Starting Dose Calculator
What is the starting dose for insulin in Type 2 diabetes?
ADA and AACE guidelines recommend starting basal insulin at 10 units per day or 0.1–0.2 u/kg/day for insulin-naïve Type 2 patients — using whichever is lower for the individual. The 10-unit fixed start is widely used because it is conservative, practical, and has been validated as effective and safe. The dose is then titrated upward by 2 units every 3 days until fasting blood glucose is consistently 80–130 mg/dL (4.4–7.2 mmol/L).
How quickly should insulin be titrated after starting?
The ADA-recommended titration schedule for basal insulin is to increase by 2 units every 3 days until fasting glucose is within the target range. Some protocols use 10–15% weekly increases. Titration must be supervised — your provider will specify the schedule, hypoglycemia safeguards, and the maximum dose to try before re-evaluating. Never self-titrate faster than your provider recommends.
What is the difference between starting dose and maintenance dose?
Starting dose is the conservative initial amount — typically 10 units or 0.1–0.2 u/kg — designed to minimise hypoglycemia risk for someone new to insulin. Maintenance dose is what the person uses after weeks or months of titration. For Type 2 diabetes with significant insulin resistance, the maintenance TDD can be far higher than the starting dose — sometimes 80–200+ units/day. Starting conservatively and titrating up is always the recommended approach.
Can I start insulin without seeing a doctor?
No. Insulin requires a prescription in virtually all countries because dosing errors can cause severe, life-threatening hypoglycemia. Starting insulin also requires education on blood glucose monitoring, hypoglycemia recognition and treatment, injection technique, storage, and when to seek emergency care. This calculator helps you understand the dosing principles — it is not a substitute for a medical evaluation, prescription, or diabetes education.
What is a safe starting dose of basal insulin?
For most insulin-naïve Type 2 adults, 10 units of basal insulin per day is the consensus safe starting point per ADA, AACE, and EASD guidelines. For people with very low body weight or elevated hypoglycemia risk (elderly, renal impairment, erratic eating), 0.1 u/kg may be even lower. This calculator shows both options so you understand the range — your prescriber will set the actual safe starting dose for you.