Twinings Green Tea: Caffeine Content Explained

A 240 ml cup of Twinings green tea contains approximately 28 mg of caffeine.

• 28 mg — typical caffeine in a 240 ml brewed cup of green tea (population average).
• 5.7 hours — average caffeine half-life in adults (caffeine roughly halves every ~5.7 h).
• 400 mg/day — FDA recommended maximum for healthy adults; aim lower in pregnancy (~200 mg/day per various authorities).
• 70 mg — caffeine in a 240 ml serving made with 1 tsp matcha powder, for comparison.

Caffeine in standard Twinings green tea

Twinings’ green tea blends that use real green tea leaves typically deliver the same population-average caffeine found in brewed green tea: about 28 mg per 240 ml cup. That 28 mg figure is consistent with nutrient databases such as USDA/FoodData Central for a standard brewed green tea serving. Individual cups will vary with leaf amount, infusion time and water temperature, but 28 mg is the practical baseline for planning intake.

Caffeine levels in flavored and infused Twinings varieties

Flavored green teas fall into two categories: (1) blends that use green tea plus flavor (jasmine, citrus, fruit infusions) and (2) herbal "fruit" tisanes that contain no tea leaves. If the product is a green tea base (for example, Twinings Jasmine Green Tea), expect roughly 28 mg per 240 ml. If the label lists a fruit or herbal infusion with no Camellia sinensis, caffeine is typically 0 mg (herbal, caffeine-free).

Comparing Twinings green tea to coffee and other teas

Context helps: green tea is low-caffeine relative to most coffees and to some concentrated tea forms. Use the table below for direct comparisons using dataset values so you can plan your daily total.

How much caffeine remains over time (decay math)

Use 5.7 hours as the population-average half-life: caffeine in the bloodstream falls roughly by half every ~5.7 hours. From a single 240 ml cup of Twinings green tea (28 mg), here are the expected amounts remaining at common intervals.

Example: drinking 240 ml at 6 PM leaves roughly 13 mg still active around midnight (6 hours later), which can affect sleep for sensitive people. The half-life varies with age, liver function, pregnancy and drug interactions; EFSA and Mayo Clinic summaries explain these modifiers.

What changes Twinings green tea caffeine from cup to cup?

Key variables that change caffeine extraction:

• Steeping time — longer steeping increases extraction; a 1–3 minute difference matters more for tea than for coffee.
• Water temperature — hotter water extracts more caffeine; green teas are often brewed cooler to avoid bitterness, which reduces caffeine release slightly.
• Leaf grade and amount — broken leaves and fannings (bag tea) release caffeine faster than whole-leaf; more grams of leaf = more caffeine.
• Serving volume — larger cup = proportionally more caffeine; a 480 ml double-strength brew will contain roughly double the mg compared with 240 ml made identically.

Health, safety and timing advice

For healthy adults the U.S. Food and Drug Administration cites an upper bound of about 400 mg/day. For people who are pregnant or trying to become pregnant many authorities recommend staying below ~200 mg/day. The American Academy of Pediatrics discourages routine caffeine use in adolescents. If you experience palpitations, severe anxiety or other concerning symptoms, consult a clinician; this page is informational only.

Because Twinings green tea is low in caffeine, it is easy to include multiple cups while staying well under 400 mg. Track exact intake with tools like CoffeeLog to sum multiple sources (tea, coffee, energy drinks, pills) and time consumption to protect sleep.

Practical tips

• If you want lower caffeine: use slightly cooler water, a shorter steep (45–90 seconds), or choose Twinings’ explicitly caffeine-free herbal options.
• To boost caffeine moderately: use longer steep times or a stronger leaf-to-water ratio, or choose matcha (≈70 mg per 240 ml with 1 tsp).
• Check packaging — Twinings labels indicate whether a product is a green-tea blend or an herbal infusion; assume green = caffeine, herbal = 0 mg unless labeled otherwise.

Sources: USDA/FoodData Central (green tea reference values), FDA guidance on daily caffeine, EFSA and Mayo Clinic overviews, and American Academy of Pediatrics guidance on youth. For daily tracking and combined-source totals, CoffeeLog can log cups and calculate remaining caffeine relative to sleep time.

How many cups of Twinings green tea equal one cup of drip coffee?

One 240 ml cup of drip coffee contains 96 mg of caffeine, so it equals about 3.43 standard 240 ml Twinings green tea cups (each 28 mg). Arithmetic: 96 mg ÷ 28 mg = 3.43 cups (dataset values).

An equivalent dose is the amount of one beverage that matches the caffeine in another beverage. In practice that means three 240 ml cups of Twinings (3 × 28 mg = 84 mg, dataset) still fall well short of a single 240 ml drip coffee (96 mg, dataset), while four 240 ml cups of Twinings (4 × 28 mg = 112 mg, dataset) exceed one cup of drip coffee.

Use the site's side-by-side comparison tool to see these pairings visually: compare Twinings to coffee and other drinks. If you keep an eye on portions, the math above lets you swap multiple green tea cups for a single coffee without guessing the total mg.

How can I mix Twinings green tea with other caffeinated drinks and stay under 400 mg/day?

To stay under the FDA's 400 mg/day limit, you can drink up to fourteen 240 ml Twinings green tea cups (14 × 28 mg = 392 mg) before exceeding 400 mg; the FDA sets the 400 mg/day benchmark for healthy adults (FDA). Arithmetic: 400 mg ÷ 28 mg = 14.29 cups, so 14 full cups = 392 mg (dataset values).

The FDA recommended maximum is 400 mg/day. Mix-and-match examples: one 240 ml drip coffee (96 mg, dataset) plus two 240 ml Twinings cups (2 × 28 mg = 56 mg, dataset) plus one 250 ml Red Bull (80 mg, dataset) totals 232 mg in that single set; each number above is from the dataset values and the green tea value aligns with USDA/FoodData Central for brewed green tea.

If you want a quick check for a planned combination, use the caffeine half-life calculator to sum present mg and the safe daily limit by body weight tool to convert an absolute limit into a per-kg target.

Can Twinings green tea change how medications affect caffeine clearance?

Yes: certain medications and health states can slow or speed the liver clearance of caffeine so that the 28 mg from a 240 ml Twinings cup lasts longer or shorter than the 5.7-hour population average. For example, drugs that inhibit caffeine metabolism can increase caffeine half-life and Mayo Clinic notes that some antibiotics and hormonal contraceptives alter caffeine clearance (Mayo Clinic).

CYP1A2 is a liver enzyme. Caffeine is primarily metabolized by the CYP1A2 pathway, so anything that inhibits CYP1A2 raises systemic caffeine for longer and anything that induces CYP1A2 shortens its half-life; authoritative summaries of modifiers appear in EFSA's and Mayo Clinic's discussions of caffeine metabolism.

Example arithmetic using the same 28 mg dose: if a medication doubles the half-life from 5.7 to 11.4 hours, remaining caffeine after 6 hours becomes 28 × 0.5^(6/11.4) ≈ 28 × 0.6945 ≈ 19.4 mg (dataset dose used in arithmetic). If you take prescription medicines and are unsure about interactions, consult your clinician or pharmacist because individual risks depend on drug class and dose.

When is the latest Twinings cup I can have before bedtime?

If your goal is to have less than 10 mg of caffeine in your system at bedtime, stop drinking a 240 ml Twinings cup about 8.5 hours before sleep using the 5.7-hour half-life model (28 mg × 0.5^(8.5/5.7) ≈ 9.9 mg). Arithmetic: solve 28 × 0.5^(hours/5.7) ≤ 10 mg → hours ≥ 8.5 hours.

A sensitive sleeper is someone whose sleep is affected by low caffeine amounts. The sleep literature shows that large doses (400 mg) taken 6 hours before bed measurably reduce sleep time (Drake et al., J Clin Sleep Med, 2013), so individual sensitivity varies and lower residual mg can still matter for some people.

Concrete examples using the 5.7-hour half-life: a 28 mg cup taken 6 hours before bedtime leaves ≈13 mg (28 × 0.5^(6/5.7) ≈ 13 mg); taken 3 hours before bedtime leaves ≈19 mg (28 × 0.5^(3/5.7) ≈ 19 mg). Use the site tool latest cup before bedtime to enter your planned bedtime and get a tailored cutoff using the population-average decay model.

Bottom line

A standard 240 ml cup of Twinings green tea contains about 28 mg of caffeine (USDA/FoodData Central and our dataset). Caffeine follows first-order elimination with a population-average half-life of 5.7 hours, so remaining caffeine after t hours = 28 mg × 0.5^(t/5.7). Use that formula to project how many mg will persist at any time after drinking.

The U.S. Food and Drug Administration sets an upper bound of about 400 mg/day for healthy adults (FDA), which equals roughly fourteen 240 ml Twinings cups (14 × 28 mg = 392 mg, dataset). For sleep timing, if you want under 10 mg in your system you should stop roughly 8.5 hours before bed using the 5.7-hour half-life model; Drake et al. showed that high doses can still disrupt sleep when taken 6 hours before bedtime (Drake et al., 2013).

Practical shortcuts: three 240 ml Twinings cups (3 × 28 mg = 84 mg, dataset) are less caffeine than one 240 ml drip coffee (96 mg, dataset); mix beverages using the dataset values and the site's calculators—see the caffeine half-life calculator and safe daily limit tool—to keep total intake within your chosen limit. For medication interactions or pregnancy-specific guidance consult a clinician and consult EFSA, ACOG or your national guidance as needed.