Correction Dose Calculator

Determines the amount of rapid-acting insulin needed to correct high blood sugar back to target.

Formula: (Current BG - Target BG) / ISF = Correction Dose

Example: (250 - 100) / 50 = 150 / 50 = 3 units.

Ensure you subtract Active Insulin (IOB) from this final number to prevent stacking.

Clinical Context

This formula requires an accurate Insulin Sensitivity Factor (ISF). If your ISF is unknown, see the ISF Calculator.

Active Insulin Warning

Never stack insulin.

If you have taken rapid-acting insulin in the last 3-4 hours, it is still lowering your blood sugar. You must subtract that active insulin from your calculated correction dose.