A
Email us
Questions, feedback, or spotted a mistake on the site? The fastest way to reach us is email:
We read everything and reply to most messages within a few days.
B
What to write about
- Corrections — wrong caffeine number for a drink, a typo, a broken link.
- Feature ideas — what would make the calculator more useful for you?
- General questions — about caffeine timing, half-life, or how the math works.
One request: we can't give personal medical advice over email. For health concerns, please talk to a clinician.