Benzodiazepine Equivalence Calculator (Ashton Manual)

Q: Are these doses the same for all indications (anxiety, sleep, seizures)?

The equivalencies in this Benzodiazepine Equivalence Calculator are based on general anxiolytic/sedative effects. They provide a reasonable starting point, but specific drug properties may be better for certain conditions. Clinical context is key.

1. Select Base Drug Click an item below to set it as the base drug.

2. Set Dose for Diazepam (mg)

For decimal points, please use your keyboard to enter directly into the input field above.

Show conversion method

Doses are converted to diazepam-equivalents using the Ashton Manual ratios:

Target dose = Entered dose × (Target equivalent mg ÷ Base equivalent mg)

Doses equivalent to 10 mg diazepam: alprazolam 0.5 · chlordiazepoxide 25 · clonazepam 0.5 · lorazepam 1 · oxazepam 20 · temazepam 20 · triazolam 0.5. Example: lorazepam 2 mg × (10 ÷ 1) = 20 mg diazepam-equivalent.

Recent Updates

Diazepam-equivalent conversion ratios are unchanged; the Ashton Manual remains the reference table for switching and tapering.
Added current safety emphasis: the FDA’s 2020 class-wide boxed warning on dependence and withdrawal, and that benzodiazepines should never be stopped abruptly (seizure risk).
Tapering guidance aligned with the 2025 multi-society guideline — tapers must be individualized; no single fixed percentage or schedule fits every patient.

Brunner E, et al. Joint Clinical Practice Guideline on Benzodiazepine Tapering: Considerations When Risks Outweigh Benefits. J Gen Intern Med. 2025;40(12):2814–2859. PMID 40526204

Key Knowledge Points

This Benzodiazepine Equivalence Calculator uses ratios from the Ashton Manual, with Diazepam 10mg as a reference.
These values are estimates for clinical guidance. Individual patient response varies, and doses should be adjusted cautiously based on clinical observation.
When switching, consider reducing the calculated dose by 25-50% for incomplete cross-tolerance, especially in elderly or frail patients.
Equivalence is based on sedative/anxiolytic effect and doesn’t account for differences in half-life or onset of action.
For tapering, a gradual switch to a long half-life agent like Diazepam is often recommended for a smoother withdrawal.

About This Benzodiazepine Equivalence Calculator

The Benzodiazepine Equivalence Calculator is a clinical tool designed for healthcare professionals to facilitate the safe conversion between different benzodiazepine medications. Whether for tapering, managing medication shortages, or switching due to side effects, converting to an equipotent dose is critical. This calculator uses accepted equivalency ratios from the Ashton Manual to provide a reliable estimate, helping prevent overdose or withdrawal.

Benzodiazepine Equivalence Table Used

This calculator’s conversions are based on the following data, with Diazepam 10mg as the benchmark for anxiolytic effects.

Benzodiazepine	Equivalent Dose (mg) to 10mg Diazepam	Half-Life Category

Clinical Interpretation

The result from this Benzodiazepine Equivalence Calculator provides a starting point for conversion, which must be tailored to the individual patient.

Incomplete Cross-Tolerance: A patient may not be fully tolerant to a new benzodiazepine. It is safer to start with a 25-50% lower dose than calculated and titrate up.
Half-Life Considerations: Switching from short-acting (e.g., Alprazolam) to long-acting (e.g., Diazepam) can lead to drug accumulation. The reverse can precipitate withdrawal.
Tapering: For discontinuation, converting to a long half-life agent like Diazepam allows for a smoother, more gradual dose reduction.

Limitations

This calculator provides an estimation. It does not account for patient factors like genetics, liver function, age, or concomitant medications. Clinical judgment is paramount. Reported equivalences are approximate and can vary between sources and with individual patient factors.

Safety: Benzodiazepines should never be discontinued abruptly — rapid withdrawal can cause life-threatening effects including seizures. In elderly or frail patients, agents without active metabolites (e.g., oxazepam, temazepam) may be preferable to long-acting diazepam to avoid accumulation. Combining benzodiazepines with opioids, alcohol, or other CNS depressants markedly increases the risk of profound sedation, respiratory depression, and death.

Frequently Asked Questions (FAQ)

1. Why is Diazepam (Valium) used as the standard for comparison?

Diazepam is the reference in the Ashton Manual due to its long, predictable half-life and availability in small 2mg increments, making it ideal for conversion and gradual tapering.

2. Can I use this calculator for Z-drugs (e.g., Zolpidem)?

No. While they act on similar receptors, Z-drugs are structurally different and cross-tolerance is unpredictable. This calculator is for benzodiazepines only.

3. What is “incomplete cross-tolerance”?

Tolerance to one benzodiazepine may not fully transfer to another. An “equivalent” dose of a new drug might feel stronger. Starting at a lower dose is a common safety precaution.

4. How fast should I taper benzodiazepines?

Tapering must be individualized. The Ashton Manual recommends a slow, stepwise reduction (often roughly 10% of the dose every 1–2 weeks, slowing further near the end), and current multi-society guidance stresses that no single fixed percentage or schedule fits every patient. Benzodiazepines should never be stopped abruptly, as rapid withdrawal can cause seizures.

5. Are these doses the same for all indications (anxiety, sleep, seizures)?

The equivalencies in this Benzodiazepine Equivalence Calculator are based on general anxiolytic/sedative effects. They provide a reasonable starting point, but specific drug properties may be better for certain conditions. Clinical context is key.

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⚠️ Disclaimer:

This tool is for informational and educational purposes only and is not a substitute for professional clinical judgment. All treatment decisions must be made by a qualified healthcare professional considering the individual patient’s full clinical context. This Benzodiazepine Equivalence Calculator is an aid, not a replacement for clinical expertise.