Steroid Conversion Calculator
Convert between corticosteroid dosages based on anti-inflammatory potency and duration of action
For Medical Professionals Only
This calculator is for healthcare professionals. Patients should never modify steroid therapy without consulting their physician. Conversions apply only to oral/IV administration.
Corticosteroid Conversion
Most commonly prescribed oral steroid • Duration: 12-36 hours
Total daily dose in milligrams
Solu-Medrol, commonly used IV/IM • Duration: 12-36 hours
Conversion Results
Pharmacologic dose, monitor for side effects with long-term use
Similar duration of action - current dosing frequency may be appropriate
Calculation Formula
1. Convert to hydrocortisone: 20 mg × 4 = 80.0 mg
2. Convert to target steroid: 80.0 mg ÷ 5 = 16.00 mg
Important Safety Warning
Always double-check calculations and contraindications. Consult prescribing information before administering. Never abruptly discontinue steroids - gradual tapering may be required.
Example: Prednisone to Methylprednisolone
Clinical Scenario
Patient: Currently on 20 mg prednisone daily
Need: Convert to IV methylprednisolone
Reason: Patient unable to take oral medications
Conversion Calculation
1. Prednisone potency: 4 (vs hydrocortisone)
2. Hydrocortisone equivalent: 20 mg × 4 = 80 mg
3. Methylprednisolone potency: 5
4. Methylprednisolone dose: 80 mg ÷ 5 = 16 mg
Steroid Equivalency Table
Short-Acting (8-12 hours)
Intermediate-Acting (12-36 hours)
Long-Acting (36-54 hours)
Note: Equivalent doses are based on anti-inflammatory potency relative to hydrocortisone (20 mg = 1 unit).
Clinical Considerations
Consider patient's liver function for prednisone conversion
Adjust dosing frequency based on steroid duration
Monitor for HPA axis suppression with prolonged use
Consider potassium and sodium retention differences
Plan appropriate tapering schedule for discontinuation
Account for individual patient response variability
Understanding Steroid Equivalency
What is Steroid Equivalency?
Corticosteroids have similar anti-inflammatory effects but differ in potency and duration of action. Steroid equivalency allows healthcare providers to substitute one steroid for another while maintaining therapeutic effectiveness.
Clinical Applications
- •Converting oral to IV steroids when NPO
- •Switching formulations for patient tolerance
- •Adjusting therapy based on availability
- •Optimizing dosing schedules
Conversion Method
Two-Step Process:
1. Convert current dose to hydrocortisone equivalent
2. Convert hydrocortisone equivalent to target steroid
Formula:
New Dose = (Current Dose × Current Potency) ÷ New Potency
Important: These calculations provide estimates. Always consider individual patient factors, clinical condition, and monitor response when converting steroids.