Calculators and Screeners for Substance Use
Straight answers to the questions people actually search for — how long something stays in your system, how much you are really drinking, whether your use crosses a clinical screening threshold.
- Published federal and clinical sources
- Method shown with every result
- Reviewed against current guidance
Built From Published Reference Tables
Detection windows, half-lives, and standard-drink conversions come from clinical references and federal datasets — each figure is named and cited on the tool that uses it.
Estimates, Not Test Results
Dose, how often someone uses, body composition, hydration, liver and kidney function, and the cut-off a lab uses all shift real-world results beyond what any calculator can model.
A Starting Point For A Conversation
These tools help you frame the question. Diagnosis, withdrawal risk, and the right level of care are clinical judgments that belong to a licensed provider.
The Toolkit
Three live calculators, each built from a published reference table and cited on the page it runs on.
Testing & Timelines
How long substances stay detectable, and how withdrawal unfolds
Alcohol
Standard drinks, blood alcohol, and weekly intake
- 01 · CalculatorBlood Alcohol (BAC) EstimatorAnswers: “What is my blood alcohol level, and when does it reach zero?”Estimate blood alcohol concentration using the body-water method documented by NHTSA, with the metabolism rate shown and every assumption stated.Open tool
- 02 · CalculatorStandard Drink CalculatorAnswers: “How many drinks am I actually having?”Convert any beer, wine, or spirit into NIAAA standard drinks, then compare daily and weekly totals against published federal drinking thresholds.Open tool
How These Tools Are Built
Each calculator is assembled from published federal or clinical reference tables rather than from figures repeated across the web. The formula is written out on the page, the agency behind every constant is named, and the sources are listed and numbered at the bottom.
No estimated figures
Where no published value exists for a substance or a test type, we say so instead of inventing a number.
The method is shown
Every tool states the equation it runs and the source that documents it.
Clinically reviewed content
The written guidance around each tool follows the same review process as our medical guides.
Nothing leaves your browser
Calculations run locally. No account, no email capture, no stored inputs.
In Development
Each tool is built and clinically reviewed the same way as our guides, then published with its sources listed on the page.
Screening
Validated instruments used in clinical settings, scored instantly
- Coming soonAUDIT-C Alcohol Screener
The three-question validated screener used in primary care, scored instantly.
- Coming soonDAST-10 Drug Use Screener
A ten-question validated screening instrument for non-alcohol substance use.
- Coming soonWithdrawal Severity Self-Check
Symptom-based guidance on whether withdrawal needs medical supervision.
Cost & Planning
What use costs, and what treatment costs against it
- Coming soonCost of Use Calculator
Translate daily spending into monthly and yearly totals, compared against treatment costs.
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