DKA Insulin Drip Calculator
Medically reviewed by Dr. Chhaya Makhija, MD, DipABLM — October 2026
Calculate the intravenous insulin infusion rate for diabetic ketoacidosis (DKA) from body weight, using the standard weight-based protocol.
How to Use the DKA Insulin Drip Calculator
- Enter body weight in kilograms.
- Choose the infusion rate — 0.1 u/kg/hr standard, 0.14 u/kg/hr no-bolus, or a reduced 0.05 u/kg/hr.
- Select the drip concentration (commonly 1 unit/mL) and whether an initial IV bolus is given.
- Read the rate in both units/hr and mL/hr, plus the bolus dose if selected.
This reproduces a standard weight-based protocol for teaching and reference. Actual orders follow your institution's DKA protocol with lab and potassium monitoring.
The DKA Insulin Infusion Protocol
In diabetic ketoacidosis, a continuous IV infusion of regular insulin shuts off ketone production and lowers glucose. The widely used ADA protocol is a fixed-rate, weight-based infusion, with or without an initial bolus.
At the usual 1 unit/mL bag, units/hr and mL/hr are the same number. Example: a 70 kg patient → 70 × 0.1 = 7 units/hr = 7 mL/hr.
An optional initial bolus of 0.1 u/kg may be given; alternatively a higher continuous rate (0.14 u/kg/hr) with no bolus is an evidence-based equivalent.
Key Protocol Safeguards
- Check potassium first. Hold insulin if K⁺ < 3.3 mEq/L and replace potassium first — insulin drives K⁺ into cells and can cause fatal hypokalemia.
- Fluids before/with insulin. IV fluid resuscitation precedes or accompanies the insulin drip.
- Add dextrose to the fluids once glucose falls below 250 mg/dL (13.9 mmol/L) and reduce the infusion to 0.05 units/kg/hr, continuing insulin to clear ketones.
- Overlap subcutaneous insulin by 1–2 hours before stopping the drip to prevent rebound. See the IV-to-subcutaneous calculator.
Starting basal insulin before the drip stops
Intravenous insulin clears within minutes of switching the pump off. Subcutaneous long-acting insulin takes hours to reach a working level. Stopping the drip and giving the first basal dose at the same moment leaves a gap with almost no circulating insulin, and ketoacidosis can rebound inside that window.
Consensus guidance therefore gives long-acting insulin at least one to two hours before the infusion stops, so the two overlap. The drip continues through that overlap rather than being tapered to nothing.
Resolution criteria come first: the drip continues until the anion gap closes and the patient can eat. Converting the infusion to a subcutaneous regimen uses roughly 60–80% of the extrapolated 24-hour intravenous requirement, and the drip-to-subcutaneous calculator works that figure out. Giving the basal dose early is a scheduling decision made on the ward, not something a calculator can time for you.
DKA Diagnostic Criteria & Severity
Diabetic ketoacidosis is confirmed by three findings together: blood glucose above ~250 mg/dL (13.9 mmol/L), metabolic acidosis (low pH and bicarbonate), and ketones in blood or urine, usually with a raised anion gap. Severity is graded from the pH, bicarbonate and mental status. After the crisis, routine dosing returns to the tools in our post-DKA insulin calculators.
| Severity | Arterial pH | Bicarbonate (mEq/L) | Mental state |
|---|---|---|---|
| Mild | 7.25–7.30 | 15–18 | Alert |
| Moderate | 7.00–7.24 | 10 to <15 | Alert / drowsy |
| Severe | < 7.00 | < 10 | Stupor / coma |
Grade severity and the anion gap with the DKA assessment calculator. The infusion rate above is usually the same across severities; severe cases differ in monitoring and fluid/electrolyte management.
Frequently Asked Questions: DKA Insulin Drip Calculator
What is the insulin infusion rate for DKA?
The standard is a continuous IV regular-insulin infusion at 0.1 units/kg/hr, often after a 0.1 units/kg bolus. A 70 kg patient receives about 7 units/hr. An alternative is 0.14 units/kg/hr with no bolus.
Why must potassium be checked before insulin in DKA?
Insulin pushes potassium into cells, which can cause life-threatening hypokalemia. If serum potassium is below about 3.3 mEq/L, insulin is held and potassium is replaced first.
When do you add dextrose during DKA treatment?
When blood glucose falls below 250 mg/dL, 5–10% dextrose is added to the IV fluids and the infusion rate is reduced to 0.05 units/kg/hr — insulin keeps clearing ketones while the dextrose prevents hypoglycemia.
Is this DKA calculator for home use?
No. DKA is a medical emergency requiring hospital care, IV fluids, lab monitoring, and a protocol. This tool is an educational reference for clinicians and students. If you suspect DKA, seek emergency care immediately.
How fast should blood glucose fall during DKA treatment?
The target is a steady fall of about 50–75 mg/dL per hour. If glucose isn't dropping at least ~50 mg/dL in the first hour (with adequate fluids), the infusion rate is often increased. Once glucose falls below 250 mg/dL, dextrose is added and the rate is cut to 0.05 units/kg/hr so insulin can keep clearing ketones without causing a low.
When can the insulin drip be stopped or switched to injections?
When DKA has resolved: glucose under 200 mg/dL plus two of — bicarbonate ≥ 15 mEq/L, venous pH > 7.3, and anion gap ≤ 12. Subcutaneous insulin is then started and overlapped with the drip for 1–2 hours before the infusion is stopped, to prevent rebound hyperglycemia and ketosis.
Sources
- Kitabchi AE, et al. "Hyperglycemic Crises in Adult Patients With Diabetes." Diabetes Care. 2009. Link
- American Diabetes Association. Standards of Care in Diabetes — 2026. Section 16. Link
- Umpierrez GE, et al. Hyperglycemic crises in adults with diabetes: a consensus report. Diabetes Care. 2024;47(8):1257–1275. Link
Written by Ryan Mitchell · Last updated: October 2026