Caffeine estimates are not personal health advice
The caffeine calculator uses reference drink values or the amount you enter. Actual caffeine can differ by product, serving size and brewing method. Its output is an estimate, not a measurement of caffeine in your drink or body, a diagnosis, a recommended dose, or a treatment plan.
The FDA's caffeine guidance describes 400 mg per day as an amount not generally associated with negative effects for most adults. It is not a target or a guarantee of safety for an individual. Effects can occur at lower amounts. The smaller comparison values in our tool are examples, not clinically established allowances for pregnancy, sensitivity or sleep.
Ask a qualified health professional about caffeine if you are pregnant, trying to become pregnant, breastfeeding, taking medicines, managing a health condition or sensitive to caffeine. Adult reference values do not apply to children or teenagers. Do not use this tool to set a child's caffeine intake or to change medication or medical advice.
What the model includes
- The current entry covers one drink type and the number of servings you enter. The half-life model treats those servings as consumed at the same time; it does not track separate drinks throughout the day.
- Other coffee, tea, energy drinks, foods, supplements and medicines are not added automatically. Account for all sources when discussing your intake with a clinician.
- The model assumes a constant half-life. Your actual metabolism is not measured, and the available slider range does not cover every person's circumstances.
- A displayed time below a selected caffeine amount is a mathematical estimate. The amount is not a proven sleep threshold, and the time does not predict when you can sleep, drive safely, or be free of caffeine's effects.
Feeling unwell takes priority over any number, color or comparison in the tool. Do not wait for an estimated clearance time before seeking help.
Equipment, cleaning and brewing recipes
Read the current manufacturer's instructions for your exact model, region and electrical rating before using, cleaning or maintaining it. Our manual library helps locate documents; it does not certify your appliance or replace its safety instructions. If a guide conflicts with the manufacturer, stop and confirm the correct procedure with the manufacturer.
- Heat and pressure: hot water, steam, glass and pressurized equipment can cause injury. Use stable, suitable vessels; respect fill lines and capacities; follow the model's cooling and pressure-release instructions before opening or disassembly. Keep children away from hot equipment.
- Electricity: switch off, unplug and cool an appliance before external cleaning or disassembly as its instructions require. Keep electrical bases, cords and plugs out of water. Stop using equipment with damage, leaks near electrical parts or other faults; use manufacturer support or a qualified repairer.
- Cleaning products: use only compatible products at the maker's specified dose, with the required rinse sequence. Washing, coffee-oil cleaning and descaling are different jobs. Do not mix cleaning chemicals, taste cleaning water or improvise chemical substitutes.
- Recipe scaling: the ratio calculator performs arithmetic; it does not check your brewer's capacity, pressure limits or suitability. A calculated amount is not permission to overfill a brewer, defeat a safety valve or alter a fixed-capacity recipe.
Recipes also require suitable ingredients, clean food-contact equipment and appropriate storage. Check labels for allergens and dietary restrictions. A taste description or recipe is not evidence that food is safe to consume.
If something has gone wrong
For collapse, a seizure, trouble breathing, inability to wake someone, or another medical emergency, call your local emergency number immediately. In the United States, call 911; in Bulgaria and elsewhere in the EU, call 112. Use the appropriate emergency service in other countries.
For suspected caffeine overdose or exposure to a cleaning product in the United States, call Poison Help: 1-800-222-1222 promptly. Elsewhere, contact your local poison service or urgent medical service. Do not wait for symptoms or rely on this website to assess an exposure.
These directions follow Poison Control's emergency guidance, the US Poison Help service and the EU emergency-number guidance. Coffee Corner's contact form is not an emergency service.
Research, illustrations and commercial links
Our current guides and reviews are research-based. Coffee Corner has no documented physical equipment tests or clinical review of its health information unless a particular page expressly provides that evidence. AI tools may assist research, writing and illustrations. AI images are illustrations, not proof that we performed a brew, cleaning cycle or product test.
We check sources and correct errors, but information can be incomplete, mistaken or out of date. A recommendation does not guarantee a product's performance, compatibility or suitability for you. See our editorial policy and affiliate disclosure for research methods and commercial relationships.
Your rights and how to contact us
Coffee Corner is operated by Anton Todorov, Bulgaria. Report a potential error or safety concern through our contact form, including the page URL and relevant model or source. Do not send medical records or other sensitive personal information.
Read our Terms and Conditions for the site's terms. These disclosures do not exclude rights or liability that cannot lawfully be excluded, and they do not replace our responsibility to correct misleading or unsafe information.