Caffeine, measured honestly

TrackCaffeine exists to answer two questions accurately: how much caffeine is in a drink, and how long it stays with you. Most pages on the web answer only the first, and often with numbers copied around without a source. We pair a curated dataset with a transparent decay model so the second question gets a real answer too.

Our data

Caffeine values come from public manufacturer disclosures, USDA FoodData Central, and published measurements. They are estimates — caffeine content varies with brewing, batch and serving size — so we label them as such and never present them as exact or medical figures. The full set of 87 drinks is published as an open dataset you can download as JSON or CSV and check or reuse.

Our method

Caffeine is eliminated through first-order pharmacokinetics. We model each dose as decaying with a half-life — 5.7 hours by default, the commonly cited population average — and sum the doses to estimate how much is in your system at any moment. This is the same engine that powers our iOS app, CoffeeLog. It is a model, not a measurement of your blood, and individual metabolism varies widely.

Who makes this

TrackCaffeine is built and maintained by Merey Tleugazin, published by VAST FLOW. CoffeeLog is our caffeine-tracking app for iPhone and Apple Watch. If you spot a value that looks wrong, tell us — accuracy is the whole point.

Not medical advice

Everything here is for general information. It is not medical advice, diagnosis or treatment. If you have questions about caffeine and your health — pregnancy, heart conditions, medication interactions — talk to a qualified professional.