Caffeine Calculator: Your Safe Daily Limit - Showcase Project

Caff Calc (caffcalc.com) is a free set of caffeine tools that answers a simple question most people can't: how much caffeine is actually safe for me, today? Generic advice says "up to 400 mg a day," but that number is for an average healthy adult. Caff Calc personalizes it. The Caffeine Overdose Calculator takes your age group, sex, body weight and preferred units (mL/oz, kg/lb) and shows your safe daily intake, how much of a given drink stays within it, and where the risk zone begins. What's inside: Caffeine safety calculator: personalized daily limit based on your own factors, with separate guidance for teens and older adults. Daily intake tracker: add the drinks you've had and see your running total against your personal limit. Caffeine half-life calculator: estimates how much caffeine is still in your system hours later, useful for planning that afternoon coffee without wrecking your sleep. "Caffeine in" database: caffeine content for 100+ coffees, teas, energy drinks and sodas, with dedicated pages for popular drinks and brands. Science blog: plain-language articles on caffeine metabolism, tolerance, sleep and overdose symptoms, with sources cited. Who it's for: coffee and energy-drink drinkers who want to stay under their limit, students pulling late nights, parents checking what's safe for a teenager, and anyone trying to cut back or time caffeine around sleep. Caff Calc runs in the browser, needs no account and loads fast on mobile. It's built and maintained by an independent developer, Ivan Ushakovsky, who wanted a caffeine tool that's personal, quick and transparent about its sources. Caff Calc is an informational tool, not medical advice. People who are pregnant, have heart conditions or take medication should check their limits with a doctor.