TDD: 0.4–0.6 U/kg (T1DM), 0.3–1.0 U/kg (T2DM)
Basal: 40–50% of TDD | Bolus: 50–60%
Carb Ratio: 500 ÷ TDD | ISF: 1700 ÷ TDD (mg/dL)
Insulin Dose Calculator 2025: TDD, Basal/Bolus, Correction, and Carb Counting
Insulin dosing requires precision. Our calculator provides total daily dose (TDD), basal/bolus split, carb ratio, insulin sensitivity factor (ISF), and correction dose. For T1DM, T2DM, DKA, and gestational diabetes.
Initial TDD by Type
| Type | TDD (U/kg/day) | Notes |
|---|---|---|
| T1DM (new) | 0.4–0.6 | Honeymoon: lower |
| T2DM | 0.3–1.0 | Obese: higher |
| DKA | 0.1 U/kg/h IV | Continue until gap <12 |
| Pregnancy | 0.7–1.0 | 2nd/3rd trimester |
Basal/Bolus Split
- Basal (50%): Long-acting (glargine, degludec)
- Bolus (50%): Rapid (aspart, lispro) with meals + correction
- Carb Ratio: Grams covered by 1U insulin
- ISF: mg/dL drop per 1U insulin
Correction Dose
(Current − Target) ÷ ISF
Example: 250 − 100 = 150 ÷ 50 = 3U correction
Special Scenarios
- DKA: 0.1 U/kg/h IV regular insulin
- Surgery: Reduce basal 20–30%, hold bolus
- Sick Day: Increase TDD 10–20%
- Pump: Basal rate = 40% TDD ÷ 24
Adjustment Rules
- Pattern: Adjust if 3-day same trend
- Basal: ±10% if fasting off target
- Bolus: ±2–4 g in carb ratio
Limitations
- Not for pediatric (<18 years)
- Does not account for exercise, stress, illness
- Requires frequent glucose monitoring
Pro Tips
- Log glucose, carbs, insulin for 1–2 weeks
- Use CGM for pattern recognition
- Recalculate TDD every 3–6 months
- Educate on hypoglycemia (15g carb)
FAQs
Can I use this for insulin pumps? Yes — basal rate from TDD.
What if weight is in lbs? Convert: 1 kg = 2.2 lbs.
How often to check ISF? Every TDD change.
Conclusion
Use our 2025 Insulin Dose Calculator for safe, personalized dosing. Always review with endocrinologist and adjust based on glucose logs.
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