[Tools](https://lokalmed.de/en/tools) # THC calculator How much THC is in your flowers or extract? Enter the details from your pharmacy label. The calculator shows the content in milligrams and, if you wish, how long a quantity will last and how much it costs. The calculator works out the content, not a dose. How much you use and when is for your doctor to decide. ## How the calculator works - ### Flowers: amount times THC content 1% THC corresponds to 10 mg of THC per gram of flower. 5 g with 22% THC therefore contain 5 × 22 × 10 = 1,100 mg of THC. The calculator works out CBD in the same way. - ### THCA is usually already included in the calculation Flowers contain THC primarily in the form of THCA, a precursor that only converts to THC when heated. According to the European Pharmacopoeia, the label states the total THC content, with THCA already included as THC in this figure. Only if a label lists THC and THCA separately will the calculator convert THCA using the factor 0.877: this is the amount of THC that remains when THCA releases carbon dioxide upon heating. - ### Up to 10% deviation The actual content of a flower may deviate by up to 10% from the value on the label. This is why the calculator also shows the range within which the content may lie. - ### Extracts: concentration times amount For extracts and dronabinol solutions, the THC concentration is stated on the label, usually in mg/ml. 10 ml at 25 mg/ml contain 250 mg of THC. If the label only gives a percentage, ask your pharmacy for the value in mg/ml. - ### Supply and costs The total amount divided by the daily amount gives the number of full days it will last. The calculator works out the cost based on the price per gram that you enter. ## What the calculator cannot do - ### No dose The calculator does not recommend any quantity and does not check whether a quantity is suitable for you. Your doctor will determine how much to use and when. - ### Not what reaches the body How much THC enters the bloodstream depends on how it is used: according to studies, around 10 to 35% when inhaled, and in some cases only around 6% when taken orally. The calculator shows what the product contains. - ### Not when you can drive The rate at which THC is broken down in the body varies so much that it is not possible to calculate a reliable waiting time. - ### No values per drop The amount of THC contained in a drop also depends on the dropper. Your pharmacy will provide the figure for your bottle. ## Frequently Asked Questions How much THC is there in 1 gram of cannabis? That depends on the THC content: each percentage point corresponds to 10 mg of THC per gram. 1 g of flowers with 20% THC therefore contains 200 mg of THC; with the permitted deviation of up to 10%, between 180 and 220 mg. Do I still need to convert THCA? Generally not. The pharmacy label states the total THC content, which already includes the converted THCA. You only need to convert if the label lists THC and THCA separately. You can enter this into the calculator. Does health insurance cover cannabis flowers? Since 30 July 2026, statutory health insurance funds have no longer covered the costs of dried cannabis flowers. They may continue to reimburse cannabis extracts of standardised quality and medicinal products containing the active ingredients dronabinol or nabilone under certain conditions. In the case of private health insurance, your policy determines the terms. Can the calculator tell me when I’ll be allowed to drive again? No. How quickly the THC level in the blood falls varies so much from person to person that no reliable waiting time can be calculated. The law does not apply the THC limit of 3.5 ng/ml if the THC comes from the proper use of a medicine prescribed for you (§ 24a(4) of the German Road Traffic Act, StVG). You may only drive, however, if you are able to drive safely. Talk to your doctor about this. Will my entries be saved? No. The calculator performs its calculations within your browser; your input does not leave your device. Only if it cannot run there – for example, because JavaScript is disabled – will your browser send the input to our server for calculation. It is not stored there either. ## More on lokalmed - [Medical cannabis · Find doctors](https://lokalmed.de/en/treatments/medical-cannabis) - [Pharmacies · Find pharmacies](https://lokalmed.de/en/search/pharmacies?treatment=medical%5Fcannabis) ## From the guide - ### [Medical cannabis: costs and health insurance in 2026](https://lokalmed.de/en/articles/medical-cannabis-costs-and-health-insurance-2026-zzqofdbemv) Since 30 July 2026, dried flowers can no longer be prescribed at the expense of statutory health insurance. What the entitlement covers today, what conditions and authorisations apply, and what costs are incurred when billed privately. Redaktion·21 August 2026·7 min read - ### [THC, CBD, cannabis flowers and extracts: what distinguishes these forms of treatment?](https://lokalmed.de/en/articles/thc-cbd-flowers-and-extracts-differences-hyj792w74y) Flowers, extracts or ready-to-use medicinal products: the difference lies primarily in standardisation and how they are absorbed by the body. What can be deduced from studies, how side effects differ and how these forms are treated under reimbursement regulations. Redaktion·21 August 2026·7 min read - ### [Prescription cannabis in Germany: requirements, procedure and which doctor is responsible](https://lokalmed.de/en/articles/medical-cannabis-prescription-requirements-process-and-doctor-lr6qnmvl0l) Who may prescribe cannabis, which medical criteria are checked, and what happens after a prescription? This overview separates prescribing from cost coverage, explains which doctor to consult for each condition, and lists documents that help with the consultation. Redaktion·21 August 2026·7 min read ## Sources - European Pharmacopoeia, monograph 3028 “Cannabis flower”, Supplement 11.5 - [ECA Academy. Neue Qualitätsstandards für medizinisches Cannabis und CBD. GMP Journal, 02.12.2024](https://www.gmp-journal.de/aktuelle-artikel/details/neue-qualitaetsstandards-fuer-medizinisches-cannabis-und-cbd.html) - [GMP Insiders. 2024 Cannabis Flower Ph. Eur. Monograph: A Walkthrough, 28.03.2024](https://gmpinsiders.com/cannabis-flower-ph-eur-monograph/) - [ECA Academy. Ph. Eur. Cannabis Monograph Proposed for Comment, 05.10.2022](https://www.gmp-compliance.org/gmp-news/ph-eur-cannabis-monograph-proposed-for-comment) - [PubChem. Tetrahydrocannabinol (CID 16078)](https://pubchem.ncbi.nlm.nih.gov/compound/16078) - [PubChem. delta9-Tetrahydrocannabinolic acid (CID 98523)](https://pubchem.ncbi.nlm.nih.gov/compound/98523) - [Lucas CJ, Galettis P, Schneider J. The pharmacokinetics and the pharmacodynamics of cannabinoids. Br J Clin Pharmacol 2018; 84: 2477–2482](https://pmc.ncbi.nlm.nih.gov/articles/PMC6177698/) - [DGVP, DGVM. Empfehlung einer Wartezeit nach Konsum von Cannabis vor Verkehrsteilnahme, 16.05.2024](https://dgvm-verkehrsmedizin.de/wp-content/uploads/2024/05/DGVP-DGVM-Stellungnahme%5FWartezeit-nach-THC-Aufnahme.pdf) - [§ 24a Straßenverkehrsgesetz (StVG)](https://www.gesetze-im-internet.de/stvg/%5F%5F24a.html) - [§ 31 Sozialgesetzbuch V (SGB V)](https://www.gesetze-im-internet.de/sgb%5F5/%5F%5F31.html) - [Sozialgericht Frankfurt am Main. Keine Cannabisblüten mehr zu Lasten der Gesetzlichen Krankenversicherung (GKV). Pressemitteilung Nr. 6/2026, 25.08.2026](https://sozialgerichtsbarkeit.hessen.de/presse/keine-cannabisblueten-mehr-zu-lasten-der-gesetzlichen-krankenversicherung-gkv) The lokalmed editorial team last checked the calculation methods, texts and sources on 27 September 2026\. [How lokalmed works](https://lokalmed.de/en/about)