Clearance / Washout Calculator
Estimate when circulating levels drop below a threshold after the last dose.
The level below which the compound is considered washed out.
Typical dose 25.0 mg–100.0 mg · models 16 weeks of decay.
Washout estimate
Levels drop below 50 ng/mL
Model-based washout (when the curve crosses the threshold).
Biological clearance (≈ 5× half-life)
A conservative pharmacokinetic rule of thumb; the threshold estimate above is more dose-specific.
Why two numbers? The threshold date is when the modeled concentration actually crosses your value (dose-dependent). The 5×half-life date is a dose-independent convention used for PCT timing and pre-bloodwork planning. Use them together — and confirm with bloodwork.
Educational use only — not medical advice. Estimates assume linear pharmacokinetics from a single dose and ignore prior accumulation, individual metabolism, and body composition. Do not use to time PCT or bloodwork without a clinician.
About this tool
The clearance and washout calculator estimates how long it takes for a compound to drop below a chosen threshold after your last dose. Enter the compound, dose, duration, and target threshold, and it applies a half-life-based washout model. It is useful for planning bloodwork timing or understanding when levels become negligible.
How to use it
- 1 Select the compound from the dataset.
- 2 Enter your last dose and how long you used it.
- 3 Set a target threshold (e.g. less than 5% of peak).
- 4 Read the estimated washout window.
Frequently asked questions
How does the calculator estimate washout?
It uses the compound half-life and assumes levels drop by half each half-life period. After about five half-lives, less than 5% of the original concentration remains, which is the common threshold for considered washed out.
Does washout mean a compound is undetectable on a drug test?
No. Detection windows target specific metabolites that can persist far longer than the parent compound. Washout estimates when active levels are negligible, not when you'd pass an anti-doping test. See the detection-time tool for that question.
Educational use only — not medical advice. Results are estimates based on published formulas and models.