Caffeine Content of Coffee: How Much Is in Each Drink?

A small espresso coffee in a ceramic cup, which contains approximately 60 to 75mg of caffeine per single shot or 120 to 150mg for a double shot, with variation depending on the coffee species (arabica contains approximately 1.2 to 1.5% caffeine by dry weight; robusta contains 2.0 to 2.7%), the dose of coffee used, and the extraction parameters — Caffeine content in espresso drinks is determined primarily by the dose of coffee used (typically 18 to 20 grams for a double espresso) and the caffeine percentage in the bean (which varies by species and origin). A standard UK café double espresso uses approximately 18 to 20 grams of coffee and extracts approximately 120 to 150mg of caffeine, depending on the coffee blend and extraction parameters. (CC / Wikimedia Commons)

Caffeine is the most widely consumed psychoactive substance in the world and the primary reason most people drink coffee. Despite this, the caffeine content of common coffee drinks is surprisingly poorly understood: many regular coffee drinkers are unaware that a large filter coffee contains significantly more caffeine than a double espresso, or that cold brew concentrate can contain 2 to 3 times the caffeine of standard brewed coffee. The single most important variable in coffee caffeine content is not the brewing method but the total dose of coffee used: more coffee equals more caffeine, regardless of whether it is espresso or filter.

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Caffeine Content by Drink Type

Drink	Serving size	Caffeine (approx.)	Notes
Single espresso	30ml	60 to 75mg	Varies by grind dose and bean type
Double espresso	60ml	120 to 150mg	Standard café shot in UK
Flat white	150 to 160ml	120 to 150mg	Double ristretto base; same caffeine as double espresso
Latte (small)	220ml	120 to 150mg	Caffeine same as double espresso; volume is all milk
Latte (large)	350 to 450ml	120 to 300mg	Many large sizes use 3 shots (3 × ~70mg)
Americano (small)	250ml	120 to 150mg	Double espresso diluted with water
Filter/drip coffee (mug)	250ml	150 to 250mg	Wide variation by coffee dose and brew strength
Instant coffee (mug)	250ml	60 to 100mg	Lower than most brewed coffee; varies by brand
Cold brew (ready-to-drink)	250ml	150 to 200mg	Higher than typical brewed coffee
Cold brew concentrate	60ml serving	150 to 250mg	Intended to be diluted 1:4 or 1:5 before serving
Decaffeinated espresso	30ml	2 to 12mg	Not zero caffeine; typically 97%+ removed

Why Filter Coffee Has More Caffeine Than Espresso

This surprises most coffee drinkers: a standard mug of filter coffee typically contains more caffeine than a double espresso. The explanation is straightforward: a double espresso uses 18 to 20 grams of coffee and produces 40 to 60ml of liquid. A mug of filter coffee uses 15 to 30 grams of coffee (depending on brew strength) and produces 250ml. More coffee means more caffeine, regardless of concentration.

Espresso is more concentrated per millilitre (approximately 2,000 to 2,500mg of caffeine per litre, versus 400 to 700mg per litre for filter coffee), but since the total volume is much smaller, the total caffeine per serving is lower. The misconception that espresso is "stronger" in terms of caffeine comes from confusing concentration with total content.

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Safe Daily Caffeine Limits

Regulatory and health guidance on daily caffeine intake:

European Food Safety Authority (EFSA, 2015): Healthy adults can safely consume up to 400mg of caffeine per day (approximately 3 to 4 standard cups of brewed coffee) without adverse effects. Single doses up to 200mg are considered safe for most adults.
Pregnant women: The UK NHS, EFSA, and the WHO recommend a maximum of 200mg per day during pregnancy. The 200mg limit reflects research associating higher caffeine intake with reduced birth weight and preterm birth. A flat white (120 to 150mg) is within this limit; two flat whites are at or above it.
Children and adolescents: EFSA recommends no more than 3mg per kilogram of body weight per day (approximately 90mg for a 30kg child). Energy drinks are the primary concern in this group.
Cardiovascular conditions: The evidence on moderate coffee consumption (3 to 4 cups per day) and cardiovascular health is largely reassuring or positive for healthy adults; people with arrhythmias or hypertension should discuss individual tolerance with their GP.

Caffeine and Arabica vs Robusta

The two main commercial coffee species differ significantly in caffeine content:

Coffea arabica: Approximately 1.2% to 1.5% caffeine by dry weight. The dominant species in specialty coffee.
Coffea canephora (robusta): Approximately 2.0% to 2.7% caffeine by dry weight. Approximately twice the caffeine of arabica. Widely used in espresso blends (particularly Italian-style blends), instant coffee, and commercial blends. Robusta also contributes more body and crema to espresso.

A coffee labelled "100% arabica" will have lower caffeine content than an equivalent blend containing robusta. Italian espresso blends (Lavazza, Illy, Kimbo) typically contain 10% to 30% robusta; the flat white from a specialty coffee shop using single-origin arabica will have lower caffeine than the same-sized drink from a Lavazza-based bar.

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