A typical 16-ounce London Fog made with Earl Grey tea contains about 40 milligrams of caffeine, though recipes range from roughly 25–80 mg.
Order a London Fog and you get a soft, creamy tea latte that sits between coffee and plain tea on the caffeine scale. That gentle feel can make you wonder whether it is closer to a cup of black tea or closer now to a latte made with espresso. If you type “how many mg of caffeine are in a london fog?” into a search bar, you likely want a clear number and a sense of how it fits into your day.
The short answer is that most standard cafe London Fog drinks fall in the range of one regular cup of black tea. A mid sized serving made with Earl Grey and milk usually lands near 40 milligrams of caffeine, while stronger recipes or larger servings move that number higher. The exact figure depends on tea strength, serving size, and the cafe or recipe you use at home.
How Many Mg Of Caffeine Are In A London Fog? Size Details
London Fog is a tea latte built from Earl Grey tea, steamed milk, and a touch of vanilla syrup. Cafes often use one or two tea bags in a cup, which means the caffeine in the finished drink tracks closely with the amount of black tea in the recipe. Coffee chains may publish a single caffeine figure for all sizes, while independent cafes adjust the tea strength as the cup gets larger.
To give you a starting point, the Starbucks nutrition page lists about 40 milligrams of caffeine in a 16 ounce London Fog. Some chains brew it stronger, especially in large sizes, which can push the caffeine toward the range of two cups of black tea. At home, many people build the drink with the same tea strength they would use for a mug of Earl Grey, then add milk and sweetener.
| Serving Size | Typical Recipe | Approximate Caffeine (mg) |
|---|---|---|
| 8 fl oz small mug | 1 Earl Grey tea bag, milk | 25–45 |
| 12 fl oz cafe small | 1 strong tea bag, extra steep | 35–55 |
| 16 fl oz cafe medium | 1–2 tea bags | 40–70 |
| 20 fl oz cafe large | 2 tea bags, long steep | 60–90 |
| Homemade light version | Short steep, more milk | 20–35 |
| Homemade strong version | Long steep, less milk | 45–80 |
| Decaf London Fog | Decaf Earl Grey | <5 |
These ranges give you a practical picture without pretending that every barista brews the same way. If you sip your drink and taste strong tannins from the black tea, you are probably closer to the higher end. A pale cup with lots of milk and a soft tea note will sit nearer the lower end.
What Goes Into A Classic London Fog Latte?
A classic London Fog starts with Earl Grey tea, which is black tea flavoured with bergamot. Hot water extracts caffeine and flavour from the tea leaves. Steamed milk adds body, while vanilla syrup rounds out the drink with a touch of sweetness. Some cafes add a little lavender, which brings a floral twist without adding more caffeine.
Since milk and syrup do not contain caffeine, the amount in your cup comes almost entirely from the tea. Two London Fogs made with the same tea but different milks, such as dairy, oat, or almond, will share nearly the same caffeine content. The dial you can move is the amount and strength of the tea itself.
Why Caffeine Numbers Differ Between Cafes
If you order London Fog from two different coffee shops on the same street, you may feel more alert after one than the other. Cafes pick different tea brands, use different steep times, and may double up the tea bags in large sizes. A shop that builds every size from a single tea bag will pour less caffeine into its larger drinks than a shop that adds extra tea for each size jump.
How London Fog Caffeine Compares To Other Drinks
Once you know how much caffeine lives in your tea latte, the next question is how it stacks up against other drinks. Most London Fog recipes sit below brewed coffee and many energy drinks, but above straight herbal tea or steamed milk with syrup. That balance makes it a comfortable pick when you want a lift that stops short of a strong coffee rush.
An eight ounce cup of black tea usually ranges from about 40 to 70 milligrams of caffeine. Earl Grey sits in that same band, since it starts with black tea as the base. Brewed coffee tends to double that number or more. Many sources list a standard eight ounce coffee near 95 milligrams of caffeine, with stronger brews climbing higher. A London Fog built on one mug of Earl Grey keeps you in the same low to mid range as a plain cup of the tea itself.
The picture changes if your cafe uses two tea bags in a large size, or if you brew a extra strong base at home. In that case, your London Fog may creep closer to weaker coffee drinks, such as a small latte with a single shot of espresso. Even then, it usually lands below the big energy drinks on the shelf.
| Beverage | Typical Serving | Caffeine Range (mg) |
|---|---|---|
| London Fog tea latte | 16 fl oz | 40–70 |
| Plain Earl Grey tea | 8 fl oz | 40–70 |
| Brewed drip coffee | 8 fl oz | 80–120 |
| Latte with single espresso shot | 12 fl oz | 60–80 |
| Energy drink | 16 fl oz can | 150–240 |
| Herbal tea blend | 8 fl oz | 0 |
| Decaf black tea | 8 fl oz | 0–5 |
This comparison helps you judge where London Fog fits into your caffeine budget for the day. If you swap a mid sized coffee for a mid sized London Fog, you often cut your intake by half or more. If you usually drink herbal tea or warm milk in the evening, adding a London Fog at night would bring in a real caffeine bump.
Daily Caffeine Limits And Safety
Most health guidelines give healthy adults room for up to 400 milligrams of caffeine a day from all sources. A single London Fog sits well under that mark, even in a large size, which is why many people use it as a gentle pick me up. The number matters once you start stacking coffee, tea, soda, and chocolate across the same day.
The safe range shrinks for people who are pregnant, breastfeeding, or sensitive to caffeine, and also for many people with heart or sleep conditions. In those cases a London Fog might still fit, but the drink should sit inside a lower daily cap. If you live with any medical condition or take regular medication, ask your doctor how much caffeine makes sense for you.
How To Ask For More Or Less Caffeine In Your London Fog
You are not stuck with a single caffeine level when you order or brew this drink. Baristas can tweak the tea strength in the same way they adjust espresso shots in a latte. At home, you have even more control over the steep time, the number of tea bags, and whether you reach for a regular or decaf blend.
Tips For A Lower Caffeine London Fog
If you like the flavour of Earl Grey but sleep poorly after tea, small adjustments make a big difference. Ask the barista to make your drink with one tea bag even in a large cup. At home, pour hot water over the tea, let it steep for one or two minutes, then discard the first brew and steep the same bag again for your latte. That first short steep washes away some caffeine, so the second round comes out milder.
You can also switch to decaf Earl Grey. Many brands sell decaf versions that still taste bright when mixed with milk and vanilla. A London Fog made with decaf tea usually lands below five milligrams of caffeine, which is close to many chocolate drinks. This suits late night reading, early-mornings when you want ritual more than stimulation, or periods when your doctor asks you to cut back on caffeine.
Ways To Build A Stronger London Fog
Some tea drinkers enjoy the flavour of London Fog but want it to stand in for a small coffee. In that case, use two tea bags in a twelve or sixteen ounce cup and let them steep a little longer before adding milk. Ask your barista to do the same, or to use a more concentrated tea base if the cafe brews one in advance.
You can also pair your London Fog with a shot of espresso on the side or in the same cup. Many cafes call this a “dirty” London Fog, since it blends tea and coffee in one drink. That twist moves the caffeine count closer to a latte while keeping the familiar bergamot aroma of Earl Grey.
Practical Ways To Track Caffeine From London Fog
If you drink tea and coffee through the day, it helps to keep a mental log of how much caffeine you already had before ordering the next round. Note the size and number of tea bags in your London Fog, then treat it as one unit in that daily tally. You do not need a lab grade count; a rough range is enough to calm guesswork and simple worry.
When you buy from a chain cafe, check the nutrition details that many brands publish on their websites or apps. Those pages often list caffeine next to calories and sugar. If the drink only lists caffeine for a single size, assume that extra large sizes land higher, especially when the barista adds more tea bags. For small independent cafes, ask the staff how they build the drink and whether they can make a lighter or stronger batch for you.
At home, you control the recipe. Write down the type of tea, the steep time, and the cup size you use most often. From there you can match your London Fog to published caffeine ranges for Earl Grey tea and black tea. Over time you will have a personal rule of thumb, such as treating your regular mug as equal to half a typical cup of coffee or another simple comparison.
By now you have a clear, solid sense today of how many mg of caffeine are in a london fog? You also know how that number shifts with size, recipe, and cafe habits, and how the drink fits alongside coffee and other teas. With that picture in mind, you can enjoy the creamy texture and citrus aroma of this tea latte while keeping your caffeine intake where you want it.