Coffee Caffeine Calculator: How Much Is Too Much?

Choose from the most popular coffee drinks and find the optimal safe amount of this coffee for your body weight.

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In recent years, highly caffeinated coffees have been hitting the market. For some of these coffees, just a single cup may lead to overdose symptoms in some people.

You might be sensitive to caffeine

Response to caffeine can vary between individuals.

If you are sensitive to caffeine, you will experience overdose symptoms (jitters, insomnia, etc) after consuming much lower amounts of caffeine than others.

Recent research shows our genetic makeup can affect the speed of caffeine metabolism.

Determining your sensitivity may come from observing your experience with caffeine or by taking a DNA test.

Caffeine levels in coffee

Caffeine levels in coffee vary (sometimes significantly) depending on the brew method and blend. Typically, slower methods have more caffeine than quicker methods.

How much caffeine is safe?

Health authorities recommend a daily dose of no more than 400 mg of caffeine – however, this will vary depending on your body weight.

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How much caffeine do coffee outlets have?

Starbucks and Dunkin Donuts tend to have higher caffeine amounts than other outlets. It’s the brewed coffee that has more caffeine than the espresso-based drinks (such as a latte or americano).

For most people, drinking coffee later in the day can impact sleep. While you may still get to sleep, your quality of rest will be compromised – you may be waking up more times at night – but not remembering it.

If you enjoy coffee but feel the effects of caffeine:

  • Consider having your coffee only in the morning (nothing from the afternoon onwards).
  • Explore lower-caffeine coffee drinks (try espresso-based drinks instead of brewed coffee).
  • Consider drinking smaller serving sizes – particularly with brewed coffee.

For example, a Grande coffee from Starbucks has 310 mg, while a Tall has 235 mg.