Lifetime Coffee Calculator
An accumulated-usage estimate: cups per day × years. It replaces an invented "coffee age" with the numbers you actually entered.
Before you start
Method : cups/day × years × 365.25; caffeine 80–100 mg per 8 oz cup.
Checked : worked examples and zero/negative inputs tested.
Review : not independently reviewed by an expert or by the organisation whose rules are used.
Your entries stay in this browser tab; nothing is sent or stored.
How to Use This Calculator
- Average 8 oz (240 ml) cups per day
- Years you've drunk coffee at about that rate
- Press Calculate
Methodology & assumptions
Lifetime cups = cups/day × years × 365.25 (average days per year). Daily caffeine = cups × 80 to cups × 100 mg. Inputs 0–30 cups, 0–100 years. Zero is allowed.
Worked examples
2 cups × 10 years: 7,305 cups.
4 cups/day: 320–400 mg, at the FDA 400 mg reference. 0 cups: 0.
Understanding your result
An estimate from your averages; real intake varies by cup size and brew.
Sources & further reading
- Spilling the Beans: How Much Caffeine is Too Much? — U.S. FDA400 mg/day reference; 80–100 mg per 8 oz cup. Checked 5 October 2026.
Frequently Asked Questions
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