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. 2013 Jan 4;4(1):115–122. doi: 10.3945/an.112.002717

Table 1.

Method of exposure assessment for beverages and caffeine

Caffeine conversion formula
Reference Range of intake Coffee/cup1 Tea/cup
mg caffeine
(12) 0, 1–3, 4–6, 7–10, >10 (cups of tea or coffee/d) 85 30
(15) 0, 1, 2, 3, 4, >4 (cups of coffee/d) 85 N/A
(13) 0–1, 2–3, >3 (caffeine units/d) 100 50
(8) <1 cup/wk, <1, 1–2, 3–5, 6–9, >10 (cups of tea or coffee/d) N/A N/A
(14) <22, 22–62, >62 (mg caffeine/d) 63 47
(3) 0, 0.14, 0.46, 2.5, 5 (cups of tea or coffee/wk) 85 30
1

1 cup ≈ 250 mL.