Antipsychotic Chlorpromazine Equivalents
Chlorpromazine equivalents (Woods 2003): convert an antipsychotic total daily dose to its 100 mg-chlorpromazine equivalent by the agent-specific factor.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Antipsychotic agent
- Haloperidol (2 mg)
- Total daily dose
- 10
Result: Haloperidol 10 mg/day ≈ 500 mg chlorpromazine equivalent.
The tool opens with these values already filled in. Replace them with your own.
What the result means
- Factors (mg ≈ 100 mg CPZ)
- chlorpromazine 100, haloperidol 2, risperidone 2, olanzapine 5, quetiapine 75, ziprasidone 60, aripiprazole 7.5.
What you enter
- Antipsychotic agent
- Total daily dose (mg)
How this is calculated
- Method
- CPZ-eq = daily dose × (100/factor). Equivalence methods differ (DDD, consensus, Woods) — conversions are approximations, not a substitute for individualized cross-titration.
Woods SW. Chlorpromazine equivalent doses for the newer atypical antipsychotics. J Clin Psychiatry. 2003;64(6):663-667. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.