If you’re asking how much caffeine is in Thai tea, a practical estimate is 20 to 60 milligrams per 8-ounce serving. The drink starts with black tea, so it usually contains less caffeine than coffee but more than most herbal infusions. The exact amount depends on the recipe and serving size.
Direct answer: A typical 8-ounce serving contains about 20 to 60 milligrams of caffeine. A strong restaurant serving may reach the upper end, while a milkier, ice-heavy glass may contain less per ounce. The total depends on the amount of black tea, brewing time, water temperature, and serving size.
| Key fact | Practical estimate |
| Typical 8-ounce serving | 20–60 mg |
| Estimated 12-ounce serving | 30–90 mg |
| Estimated 16-ounce serving | 40–120 mg |
| Brewed black tea, 8 ounces | About 48 mg |
| Brewed coffee, 8 ounces | About 96 mg |
| Main caffeine source | The black tea base |
| Does milk remove caffeine? | No |
| Can the amount vary? | Yes, sometimes widely |
The 12- and 16-ounce figures are proportional estimates. They assume the same tea concentration as an 8-ounce serving. A café may use more ice, milk, water, or tea concentrate, so its drink may fall outside these ranges.
Key Takeaways
- Most 8-ounce servings contain roughly 20 to 60 milligrams of caffeine.
- Larger café drinks may contain more caffeine because they use more tea concentrate.
- Black tea provides the caffeine. Sugar, milk, and spices do not create it.
- A typical serving contains less caffeine than an equal-sized cup of brewed coffee.
- Longer brewing times and a higher tea-to-water ratio can increase the amount.
- Decaffeinated black tea or a caffeine-free herbal base can provide a lighter alternative.
How Much Caffeine Is in Thai Tea by Serving Size?
There is no single amount that applies to every recipe. Most estimates place an 8-ounce serving between 20 and 60 milligrams. Regular brewed black tea contains about 48 milligrams per 8 ounces, which supports that general range.
Use this serving-size chart for basic planning:
| Cup size | Estimated caffeine | What could change it |
| 8 ounces | 20–60 mg | Tea strength and dilution |
| 12 ounces | 30–90 mg | Amount of concentrate used |
| 16 ounces | 40–120 mg | Recipe, ice level, and serving size |
| 20 ounces | 50–150 mg | Strong concentrate or extra tea |
The figures for larger sizes are proportional estimates, not universal café measurements. For example, a 16-ounce cup packed with ice may contain less brewed liquid than a full 16-ounce hot tea. Another shop may use a concentrated base that pushes the caffeine content higher.
When a restaurant publishes nutrition information, use its stated figure instead of a general estimate. When no information is available, ask how much tea concentrate the café uses in each drink.
Why the Caffeine Amount Changes
The Tea-to-Water Ratio
A recipe made with several tablespoons of loose tea per quart will be stronger than one made with only a few tea bags. More tea leaves give the water more caffeine to extract.
Commercial mixes also vary. One package may contain mostly black tea, while another may include flavoring, coloring, spices, or other ingredients. Check the ingredient list and preparation instructions before estimating the caffeine content.
Brewing Time and Water Temperature
Hotter water extracts caffeine more efficiently. Longer contact between the leaves and water can also increase the amount released into the finished drink. Research on tea preparation has found that brewing conditions, including time and temperature, can produce measurable differences in caffeine levels.
Thai tea is often prepared as a strong concentrate because the flavor must remain noticeable after milk, sugar, and ice are added. This method can place it near the higher end of the typical black tea range.
Ice, Milk, and Water
Milk and ice do not destroy caffeine. Instead, they dilute the drink by increasing its final volume.
Imagine that a pitcher contains 240 milligrams of caffeine. Dividing it into four servings gives each serving about 60 milligrams. Adding milk or ice makes each glass larger, but it does not change the pitcher’s total caffeine content.
Condensed milk, evaporated milk, regular milk, and sugar do not add meaningful amounts of caffeine. Any caffeine in the drink still comes from the brewed tea base.
Cup Size
A large serving can contain more total caffeine even when it tastes mild. Sweetness and creaminess may hide the black tea’s bitterness, so flavor is not a reliable measure of strength.
Consider the entire serving rather than comparing only the amount per 8 ounces. This distinction matters when a restaurant serves 16, 20, or 24 ounces in one cup.
Caffeine in Thai Tea Compared With Other Drinks
| Drink | Serving | Typical caffeine content |
| Thai tea | 8 oz | About 20–60 mg |
| Brewed black tea | 8 oz | About 48 mg |
| Brewed green tea | 8 oz | About 29 mg |
| Cola | 8 oz | About 33 mg |
| Brewed coffee | 8 oz | About 96 mg |
| Espresso | 1 oz | About 63 mg |
| Decaffeinated black tea | 8 oz | About 2 mg |
This comparison explains why the drink often feels milder than coffee. An ordinary 8-ounce cup of coffee contains about twice as much caffeine as an average cup of brewed black tea. A concentrated recipe can narrow that gap, especially when the serving is large.
The FDA cites 400 milligrams per day as an amount that is not generally associated with negative effects in most adults. Personal tolerance varies, and caffeine from coffee, soda, chocolate, medicine, and energy drinks also counts toward your daily intake.
Can Thai Tea Keep You Awake?
Yes. A glass consumed late in the day may affect your sleep, especially if you are sensitive to caffeine or have already consumed coffee.
Caffeine sensitivity differs from person to person. Signs that you may be consuming too much include restlessness, nervousness, a racing heartbeat, headaches, digestive discomfort, and trouble sleeping. Body weight, medication, health conditions, and individual sensitivity can also affect how a person responds.
Try having your last caffeinated drink earlier in the day if you notice sleep problems. You can also choose a smaller serving or ask for a weaker tea-to-milk ratio.
People who are pregnant, trying to become pregnant, breastfeeding, taking medication, or managing a medical condition should ask a healthcare professional about an appropriate caffeine limit.
Read More: Jasmine Green Tea
How to Order or Make a Lower-Caffeine Version
You do not have to give up the flavor completely. These changes can reduce the amount of caffeine:
- Choose a smaller cup. Moving from a 16-ounce serving to an 8-ounce serving may reduce the total substantially.
- Ask for less concentrate. Requesting more milk or water reduces the amount of brewed tea used.
- Use decaffeinated black tea. Brewed decaffeinated black tea may contain about 2 milligrams per 8 ounces.
- Try a caffeine-free base. Rooibos can provide color and body, although the flavor will not be traditional.
- Avoid extra tea concentrate. Some bubble tea shops offer stronger bases or additional concentrate.
- Track other drinks. Coffee, cola, chocolate, and energy products can increase your daily total.
At home, keep the concentrate separate from the milk and ice. This allows you to control how much concentrate goes into each serving. Label the pitcher with the number of tea bags, the total amount of water, and the intended number of servings.
Store homemade concentrate in a clean, covered container. If you keep drinks in a secondary appliance, Gladnota’s guide to choosing a garage-ready refrigerator may help.
Sweetened concentrate can leave sticky residue. Gladnota’s kitchen-cleaning guide explains how to clean counters and appliances in a practical order. For natural stone countertops, review the site’s granite sealer guide before using acidic or abrasive products.
Do Not Confuse Caffeine With Sugar
Caffeine and sugar are separate concerns. The caffeine comes from black tea, while most of the sugar comes from sweetened condensed milk and added sweeteners.
An 8-ounce serving may contain about 154 calories and 24 grams of sugar. Restaurant recipes can vary considerably, so these numbers should not be treated as fixed amounts.
A drink can be low in caffeine but high in sugar. It can also contain a substantial amount of caffeine without tasting bitter because condensed milk masks the tea’s sharpness.
To reduce the sweetness, ask for half the usual amount of syrup or condensed milk. At home, add sweetener after the concentrate cools so you can taste and adjust each serving.
Your Next Step
Ask the café about the drink size and whether it uses a premixed concentrate. Choose a smaller cup when the strength is unknown, especially later in the day.
At home, record the amount of tea, the volume of water, and the number of servings. That simple record will give you a better estimate than color, sweetness, or taste alone.
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Frequently Asked Questions
Most 8-ounce servings contain about 20 to 60 milligrams. A large or strongly brewed drink may contain more. Check the restaurant’s nutrition information when it is available.
Milk does not remove caffeine from tea that has already been brewed. It lowers the concentration per ounce by increasing the drink’s final volume. The total amount of caffeine remains the same unless less tea concentrate is used.
Usually not. Brewed coffee typically contains about 96 milligrams per 8 ounces, while brewed black tea contains about 48 milligrams. However, a strong, oversized café drink can contain nearly as much caffeine as coffee.
Traditional Thai tea made with regular black tea is not caffeine-free. You can make a low-caffeine version with decaffeinated black tea or a caffeine-free variation with rooibos. Check packaged mixes because some products may contain regular tea even when their flavor seems mild.
The common spices and food coloring do not provide the drink’s caffeine. The stimulant comes from the black tea. Check the label when using a packaged mix because formulations vary.
For most adults, an estimated 40- to 120-milligram serving is below the FDA’s general daily reference of 400 milligrams. Your total daily intake and personal sensitivity matter more than a single serving.
