The Strongest Coffee in Australia

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It’s no secret that coffee is Australia’s favourite brew for waking up in the morning. But what if a regular cup just isn’t doing the trick?

Enter the world of super-strong coffee.

While many people believe that darker coffee is stronger, this isn’t usually the case. In fact, the roast level plays a minimal role in terms of the amount of caffeine in your cup. The strength of the coffee will be more influenced by the coffee bean variety and the brew method.

Many coffee suppliers in Australia claim to produce the strongest bean on the market, each with their own unique take on high-caffeine coffee. Here’s a sample of high caffeine brands for you to check out:

Sons of Amazon Strong and Fair Coffee Beans

Sons of Amazon is a blend of both Robusta and Arabica beans that have been ethically sourced from the Amazon. They are members of the Rainforest Alliance, an international non-profit organization working to protect forests and improve the livelihoods of farmers.

This coffee claims to have 440 milligrams of caffeine content for each cup of coffee, making it 200% stronger than regular coffee. The coffee produces a silky crema with low bitterness and a dark chocolate flavour.

Sons of Amazon offer a 500g whole bean bag as well as other options such as ground coffee and coffee pods.

East Australia Coffee Company Voodoo

EACC’s Voodoo whole beans come in a 250g or 1kg coffee bag. They say that their beans have the highest caffeine content on the market (18,650 mg/kg), which is the result of independent authorized testing.

One downside of these beans is they don’t say what type of beans they include in their blend or what to expect in terms of flavour.

Killer Coffee Co Industrial Strength Coffee

Killer Coffee offers two blends of 100% arabica coffee. The Industrial Strength blend is full-bodied with a rich taste and a smooth flavour, while their Darker Side blend is more intense in flavour and leans towards dark roasts.

Both blends can be bought as whole beans or ground for french press, drip coffee, espresso or coffee pods. You can purchase 2 x 200g bags or a 1 kg bag.

One of the advantages of Killer Coffee is the fact that they offer two “deadly” blends that cater to both those who like a medium roast and those who prefer dark roast coffee. This coffee has 180mg of caffeine content for every 100ml of coffee.

High Voltage Coffee Co

High Voltage Coffee use beans that have been ethically sourced from rainforest alliance farmers. They produce a smooth coffee that is strong in taste and guarantee to deliver your coffee within just a few days of roasting every time you order.

High Voltage offers a one time purchase or a subscription of their beans where you can choose from either a 200g or 1kg bag. The subscription service can be handy for those who never want to run out of coffee.

Black Insomnia Coffee

Black Insomnia offers a complex coffee with notes of chocolate and nuts while delivering a smooth and strong coffee without the bitter taste.

The coffee is made out of a blend of Robusta and Arabica and is roasted in small batches in a drum roaster. Expect caramel sweetness and a heavy chocolate aftertaste.

Black Insomnia offers two bags of whole beans: 453g or 950g. They also offer their coffee already ground and in pods.

Which type of coffee beans have the most caffeine?

How much caffeine a coffee bean has depends on the type of bean. Arabica and Robusta both have a caffeine molecule that goes hand in hand with how dense the beans are.

Dense beans are the result of high altitude, and because Robusta beans grow at a much lower altitude, they naturally have a higher caffeine content.

Arabica beans will contain 1.2% caffeine, which is roughly 12 milligrams of caffeine per gram of coffee. Robusta has a higher caffeine content with 2.2% or 2.2 milligrams. Robusta beans will naturally have more caffeine regardless of the roasting process.

Caffeine serves as a pesticide so it is only natural that Robusta beans contain more, as they grow in areas that are more accessible to pests.

The other big influencer of the amount of caffeine in your coffee is the brewing method. For example, a cup of filter coffee has about 100 milligrams of caffeine and espresso has about 55 per shot.

How to make strong coffee

The first step towards making strong coffee is understanding and adjusting the coffee to water ratio. To make a strong coffee, you’ll need more grams of coffee in order to brew a cup that is heavy and bold on the mouth instead of watery.

We suggest starting with a 1:15 ratio (one part coffee for 15 parts water) and slowly making your way down to stronger and stronger ratios. Keep in mind that using too much coffee might result in a bitter flavour, so you will have to experiment in order to reach your optimal ratio.

Regarding brewing time, choose methods that involve a longer brewing time such as drip coffee, french press and even espresso or Moka pots. For the first two, you will need a course grind and slightly more coffee in comparison to the last two, which require a fine grind and less coffee.

If a strong taste is important to you, choose a darker roast. Dark roasts have a bold flavour, which plays a key part in making coffee that tastes strong.

Just a reminder, caffeine consumption should be limited to no more than 400 milligrams per day.

The World’s Strongest Coffee

Looking outside of Australia, we find a number of other roasters claiming to be creating the strongest coffee possible.

Here are some of the more well known:

Death Wish Coffee

Death Wish Coffee is USDA Organic and Fair Trade Certified. They offer both dark and medium roasts.

The beans were grown at a high altitude, offering notes of caramel, roasted peanuts and stone fruit. Both roast levels work great on their own in different brew methods or with milk.

Death Wish allows for a one time order or a subscription where you save 10%. You can buy coffee bags in sizes of 450g, 900g, or even 2kg.

Biohazard Coffee

Biohazard Coffee is “lab-tested” coffee that has 928mg of caffeine content per cup, which is more caffeine than what most energy drinks have.

These beans come in a 900kg or 2.2kg bag as either whole bean or ground.

One drawback here is that they do not say which beans have been used in their coffee, what flavour notes to expect, or even the roast level.


Which coffee has the strongest taste?

There is a common misconception about “very strong coffee”. Some people believe that darker roasts have the strongest taste. Truth is, there are more important variables that would dictate how strong your coffee tastes. These variables are mainly the coffee ratio that you use and the brewing method. Espresso based drinks and cold brew coffee are two that are not only high in caffeine but can also be the strongest coffee in terms of taste. If you want very strong coffee we suggest trying one of these two. Alternatively, you can experiment with very concentrated filter coffee.

What roast is the strongest coffee?

Roast levels do not determine the strength of a coffee. Just because coffee beans have a dark roast, they’re not necessarily the strongest coffee. It all depends on the coffee to water ratio you are using. However, dark roasted coffee weighs less because it has a lower water content, which means that you will need more beans to reach your ideal ratio. And more beans equal more caffeine. If you are looking for a roast level with slightly more caffeine (stronger), go with a darker roast and use more coffee for the flavour. You can also achieve this by using fewer grams of coffee with lighter roasts.

Which coffee is highest in caffeine?

Cold brew coffee has the highest caffeine punch due to the immersion process it goes through. This coffee can be prepared ready to drink or as a concentrate. A large cup can contain around 200 milligrams of caffeine. Filter coffee can also be high in caffeine, containing up to 100 milligrams of caffeine for each cup. For comparison, a shot of espresso has around 55 milligrams of caffeine and a cup of Turkish coffee has 63 milligrams.