AriZona
How much caffeine is in AriZona Green Tea?
Data checked against the source on 2026-10-03 by Oleksii Y.
One 22 oz can of AriZona Green Tea has 15–18 mg of caffeine, according to AriZona Beverages.
How AriZona Green Tea compares
- Strength: 2.5 mg per 100 ml (middle of the range).
- One 22 oz can has as much caffeine as about a quarter to a third of a cup of brewed coffee, which has 94.8 mg per 8 fl oz cup.
- Of the 18 other teas in our tea chart, 14 have more caffeine per serving and 4 have less.
How much will be left at bedtime?
1 × 22 oz can of AriZona Green Tea (middle of the range)
Left at 11:00 PM (8 h later), average metabolism
≈ 6 mg
Range 3–9 mg (fast to slow metabolism)
17 mg is already at or under the 50 mg this tool aims to have left at bedtime.
What sleep studies found near this dose
- Gardiner et al. 2025 (randomized trial): In 23 healthy young men, 100 mg taken 12, 8 or 4 hours before bed had no significant effect on measured or self-rated sleep.
- Gardiner et al. 2023 (meta-analysis): To avoid losing sleep time, the authors suggest a coffee (107 mg per 250 ml) at least 8.8 hours before bed.
Estimate from a simple model: half-life of 3, 5 or 8 hours, 50 mg bedtime target. How we calculate
Caffeine by size
| Serving | Caffeine |
|---|---|
| 22 oz can | 15–18 mg |
| 12 oz serving | 8–10 mg |
How long does AriZona Green Tea stay in your system?
Our model halves caffeine every 5 hours for average metabolism, and every 3 or 8 hours for fast or slow metabolism. From one 22 oz can of AriZona Green Tea (17 mg), about 9 mg is still in your body 5 hours later and about 4 mg after 10 hours. If you clear caffeine slowly (an 8-hour half-life), about 7 mg is left after 10 hours.
Estimated caffeine left at 11:00 PM from one 22 oz can (17 mg), using a half-life of 5 hours for average metabolism and 3 to 8 hours for the range. How we calculate
| Had at | Left at bedtime (average) | Range |
|---|---|---|
| 8:00 AM (15 h before bed) | ≈ 2 mg | 1–5 mg |
| 12:00 PM (11 h before bed) | ≈ 4 mg | 1–7 mg |
| 3:00 PM (8 h before bed) | ≈ 6 mg | 3–9 mg |
| 6:00 PM (5 h before bed) | ≈ 9 mg | 5–11 mg |
How many fit in a day?
Reference amounts are for caffeine from all sources combined. Counted at the upper end of the stated amount, one serving at a time:
- Up to 400 mg a day for most healthy adults (FDA, EFSA): about 22 servings.
- Up to 200 mg at one time for healthy adults (EFSA): about 11 servings in one go.
- Up to 200 mg a day in pregnancy (EFSA, NHS): about 11 servings.
These are reference amounts for groups of people, not a personal limit. Some people feel jittery or sleep worse on much less. See the cutoff calculator for timing.
Good to know
AriZona gives these caffeine amounts as approximate ranges in a brand blog post, not on the can label.
AriZona Green Tea vs other flavored bottled tea drinks
- Brisk Lemon Iced Tea: AriZona Green Tea has less caffeine than Brisk Lemon Iced Tea per 12 oz serving: 8–10 mg vs 11 mg.
- Snapple Peach Tea: AriZona Green Tea has less caffeine than Snapple Peach Tea per 100 ml (2.5 vs 7.8 mg). AriZona Green Tea: 15–18 mg per 22 oz can; Snapple Peach Tea: 37 mg per 16 fl oz bottle.
- Instant tea: AriZona Green Tea has less caffeine than instant tea per 100 ml (2.5 vs 11 mg). AriZona Green Tea: 15–18 mg per 22 oz can; Instant tea: 26.2 mg per 8 fl oz serving (238 g).
Common questions
How much caffeine is in AriZona Green Tea?
AriZona Beverages gives 15–18 mg of caffeine per 22 oz can. Other sizes are in the table on this page.
How many AriZona Green Tea servings can I have in a day?
The FDA and EFSA cite up to 400 mg of caffeine a day, from all sources combined, for most healthy adults. At 15–18 mg per 22 oz can, that is about 22 servings if AriZona Green Tea is your only source. In pregnancy the reference is 200 mg a day.
How late can I drink AriZona Green Tea?
One serving has about 17 mg, which is at or under the 50 mg our calculator aims to have left at bedtime, so it sets no cutoff for a single serving. Several servings add up.
How long does AriZona Green Tea stay in your system?
Of the 17 mg in one 22 oz can, roughly 9 mg remains after 5 hours and 4 mg after 10 hours with our average 5-hour half-life. From fast to slow metabolism, 10 hours later it is between 2 and 7 mg.
Where the number comes from
- How much caffeine is in AriZona Green Tea and how it compares to other drinks. AriZona Beverages. Article text: "about 8 to 10 mg of caffeine in every 12 oz. serving"; 22 oz can "about 15 to 18 mg" Accessed 2026-10-02. Source ↗
Recipes and labels change. If a number here no longer matches the label, the label wins.
General information, not medical advice
If you feel unwell after caffeine — for example chest pain, a fast or irregular heartbeat that does not settle, fainting, confusion or trouble breathing — get urgent medical help. If you are pregnant or breastfeeding, under 18, take medication, or have a heart, liver or anxiety condition, high blood pressure or a sleep disorder, ask a doctor or pharmacist what amount is right for you.
Sources
- U.S. Food and Drug Administration (2024). Spilling the Beans: How Much Caffeine is Too Much? FDA Consumer Updates. fda.gov ↗
- European Food Safety Authority. Caffeine | EFSA. EFSA topic page (summary of the 2015 Scientific Opinion on the safety of caffeine). efsa.europa.eu ↗
- NHS. Foods to avoid in pregnancy. NHS. nhs.uk ↗
An app for better sleep is on the way
We’re working on a mobile app to help you sleep better. It isn’t out yet. Leave your email and we’ll let you know when it launches.