Ashton Method Calculator
Convert your benzodiazepine to its diazepam equivalent and generate an Ashton Manual–style reduction schedule.
The Ashton Method — from Professor C. Heather Ashton's 2002 manual Benzodiazepines: How They Work and How to Withdraw — is the most widely referenced protocol for coming off benzodiazepines. It rests on two ideas: switch to a long-acting benzodiazepine (usually diazepam) if you're on a short-acting one, then reduce gradually in small percentage steps with adequate holds.
This calculator handles the math for both parts. Select your medication to see its diazepam equivalent, then generate a percentage-based schedule in the style of the manual's slow-taper tables. Every schedule is printable, so you can bring it to your prescriber.
Method origin
Prof. C. Heather Ashton, Newcastle University, 2002
Core cut size
≈5–10% of current dose per step
Typical holds
1–4 weeks per step
Preferred vehicle
Diazepam (long half-life, small dose forms)
The equivalents behind the method
The manual's equivalency table maps each benzodiazepine to the diazepam dose with roughly the same effect: 0.5mg alprazolam ≈ 0.5mg clonazepam ≈ 1mg lorazepam ≈ 20mg temazepam ≈ 25mg chlordiazepoxide ≈ 10mg diazepam. These are approximations — real-world sensitivity varies — but they're the standard starting point prescribers use for crossovers, and they're what this calculator uses for its diazepam-equivalent column.
The crossover itself is staged, not sudden: the manual substitutes diazepam for one portion of one dose at a time, over several weeks, before any actual reduction begins. Our step-by-step Ashton Method guide walks through that sequencing in detail.
What "Ashton-style" tapering actually means
People often reduce the manual to "cut 10% every two weeks," but its real principle is flexibility within structure: the schedule is a proposal, and the patient's symptoms are the veto. Ashton's published tables shrink the cut size as the dose falls — exactly the exponential pattern this calculator generates — and she repeatedly notes that nobody should be rushed through the final milligrams.
The manual predates today's micro-tapering and liquid-titration techniques, which many in the community now layer on top of Ashton-style percentages for the low-dose endgame. Both approaches share the same DNA: small, patient-led, percentage-based cuts. Read more on why the method remains the gold standard.
Frequently Asked Questions
What is the Ashton Method?
It's the benzodiazepine withdrawal protocol from Professor Heather Ashton's 2002 manual: cross over from short-acting benzodiazepines to an equivalent dose of diazepam in stages, then reduce gradually — roughly 5–10% of the current dose per step, held 1–4 weeks — adjusting speed to symptoms. It remains the most cited tapering framework in both clinical guidance and the patient community.
What are the Ashton Manual benzodiazepine equivalents?
Approximately: 0.5mg alprazolam (Xanax), 0.5mg clonazepam (Klonopin), 1mg lorazepam (Ativan), 20mg temazepam (Restoril), 20mg oxazepam (Serax), and 25mg chlordiazepoxide (Librium) each equal about 10mg of diazepam (Valium). These are approximations used as crossover starting points, not exact conversions.
How fast does the Ashton Manual say to taper?
The manual's schedules reduce roughly 5–10% of the current dose every 1–4 weeks, with total tapers commonly lasting 6–18 months depending on starting dose and individual response. Ashton stressed that the schedule should slow whenever symptoms become hard to manage — the patient sets the pace.
Do I have to switch to diazepam to use the Ashton Method?
No. The crossover is recommended for short-acting benzodiazepines like alprazolam and lorazepam, where blood-level swings make direct cuts rough. People on longer-acting drugs like clonazepam or chlordiazepoxide often taper directly using the same percentage principles. The calculator on this page supports both — just select your medication.
Is the Ashton Manual still valid in 2026?
Its core principles — gradual percentage-based reduction, long hold times, patient-led pacing, and crossover for short-acting drugs — are echoed in modern deprescribing guidelines, including the 2024 FDA class-wide label update warning against rapid discontinuation. Newer community techniques like micro-tapering extend rather than replace it.
Sources & methodology
Equivalence values and reduction percentages follow the Ashton Manual (Prof. C. Heather Ashton, 2002), consistent with modern deprescribing guidance recommending gradual, patient-led benzodiazepine reduction and warning against abrupt discontinuation. This calculator performs arithmetic only — it is educational, not a prescription. Always work with your prescriber.