Joint Calculator — Cannabis Dose & Intensity Estimator
Plan your amount. Know what to expect.
What are you using?
When cannabis is smoked, around 63–80% of THC is lost to burning and sidestream smoke. Only part of the remaining THC reaches the inhaled smoke, and typically around 10–25% of the THC in the material is absorbed by the body.
How much do you intend to consume?
Enter the THC percentage printed on the package. If you do not know it, leave the typical value shown.
How often do you use cannabis?
How do you want to feel?
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Why We Built Joint Calculator
Cannabis dosing should be based on more than guesswork. Joint Calculator is built around published research, consumption data and your own personal statistics to help you better understand how amount, potency, consumption method and tolerance can affect your experience. We take what the research tells us and combine it with what you record from your own sessions, making the estimates more relevant to you over time. Our goal is simple: use actual data to help you have a better experience with cannabis.
Research sources
The absorption ranges used in this calculator are extrapolated from the peer-reviewed research listed below. Individual results still vary.
- Clinical Evaluation of the Cannabis-Using Patient: A Moving Target
- Mechanisms of Action and Pharmacokinetics of Cannabis
- From User Behavior to Laboratory Standards: Cannabis Smoking Machine Protocols from Real-World Puff Topography Data
- Mode matters: exploring how modes of cannabis administration affect THC plasma concentrations and subjective effects
Estimates can vary significantly depending on the person, product, potency, consumption method and setting. Never drive, cycle, operate machinery, or perform tasks that require full attention while impaired. Cannabis laws vary by country and region. Make sure you understand and follow the laws that apply to your country. Joint Calculator provides estimates for informational and educational purposes only. It does not measure your actual THC absorption, predict exactly how you will feel, or provide medical, legal or safety advice.