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Caffeine Safe Maximum Calculator

Are you a coffee drinker? If so, then you'll love our coffee calculator. It will help you determine the optimum amount of coffee to drink each day in order to achieve the desired results.

Caffein Safe Maximum

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Table of contents

What is caffeine?
How much caffeine should I consume in a day?
Caffeine and pregnancy
Caffeine and children
How long does caffeine last?
Is caffeine bad?
Symptoms of caffeine withdrawal
Signs of caffeine overdose
Treating caffeine overdose

What is caffeine?

According to Britannica, caffeine is "one of the most commonly consumed dietary ingredients in the world. It's found in coffee beans, cacao beans, and tea leaves and is a natural stimulant." It is often found in soft drinks and many other foods.
Caffeine is known for its stimulant effects, which, among other benefits, can increase physical endurance, reduce fatigue, and increase mental alertness. Recent studies have also found that caffeine can help with weight loss. Once consumed, caffeine is quickly absorbed into your bloodstream and begins to exert its effects within 15-30 minutes.

How much caffeine should I consume in a day?

Moderate caffeine consumption is a good thing insofar as it has recognized benefits. It's always a personal decision, so it's best to consult your health professional to see how much caffeine is safe for you. A healthy adult without medical issues typically consumes 200-400mg of caffeine daily without any adverse effects.
Whether you’re a student or an office worker, it’s important to understand how much caffeine is safe to consume daily. This is where our caffeine tolerance calculator comes in. You can input your body weight to see how much caffeine is safe for you.
If you have caffeine sensitivity, you'll feel the effects of caffeine more than someone without it. Coffee may seem harmless, but it can lead to intense side effects for people with caffeine sensitivity. For ultra-sensitive people, there are still important things to be aware of. Different mg amounts are considered "safe zone" and "maximum.”

Caffeine and pregnancy

Some women are concerned about the negative effects of caffeine on pregnancy. Therefore, it is important to know what limits pregnant women should put on their caffeine intake. Several studies have found that pregnant women who consume 300+ mg of caffeine daily are at a greater risk of having a reduced chance of getting pregnant. Therefore, it is important to be aware of caffeine's possible risks. A healthy pregnant woman without medical issues consumes ≤300 mg/d of caffeine.

Caffeine and children

Yes! Multiple studies have shown that it is safe for children to drink caffeine if they do not have any medical issues. A healthy child, who doesn't have any medical issues, is considered to consume ≤2.5-3 mg of caffeine per kg body weight per day.

How long does caffeine last?

It takes a little longer for decaf to have an effect - around 3 hours - but it's still absorbed quickly, with over 98% of the caffeine being absorbed in that time.
Caffeine's half-life is 8 hours. That means that after you drink 20mg of caffeine, it will take 8 hours for the 50% of the caffeine to break down in your body. The second 50% of the caffeine will spend longer in your body than the first 5 hours.

Is caffeine bad?

Even if you're a coffee lover and enjoy a caffeine buzz every morning, it's important to remember that too much caffeine can be a harmful thing. That's why it's always a good idea to have a caffeine calculator on hand to help you stay safe. By using this tool, you'll be able to pinpoint how much caffeine is safe for you to drink in a day.
It's important to be aware of "hidden caffeine" - drinks that contain caffeine, but the presence of this ingredient is not easily seen on the label. In fact, it may be hidden in tiny font or buried in the back of the bottle. In addition, there is no global rule for indicating caffeine, so it's important to pay attention to what's on the labels of your caffeine-containing drinks.

Symptoms of caffeine withdrawal


Headaches are one of the most common symptoms of caffeine withdrawal. One reason is because when you stop or reduce caffeine consumption, your blood vessels expand and this increase in blood flow stimulates headaches. They can linger for hours after the caffeine has been eliminated from your system.


In order to achieve the desired effects, caffeine is often consumed in small doses throughout the day. sudden discontinuation of caffeine can lead to fatigue or a feeling of drowsiness.


Anxiety is a common side effect of caffeine withdrawal. Caffeine boosts blood pressure, stress hormones, and heart rate. Your body becomes dependent on this, both physically and mentally. When caffeine intake is stopped, your body experiences anxiety as a result.

Problem concentrating

Caffeine is a psychoactive drug, which means that it alters your mood and behaviour. For some people, a cup of coffee, tea, or an energy drink is necessary to stay focused and be productive. But for others, who start to rely on caffeine to get through the day, cutting back on their intake can lead to problems concentration.


Although caffeine is generally considered to be a stimulant that leads to a boost in energy and feelings of happiness, it's also known to have some negative side effects. For instance, it can lead to an increase in negative emotions, such as depression. Unfortunately, quitting caffeine can sometimes make these negative feelings more visible.


Caffeine can have both positive and negative effects. Some people find that they become happier and more energized when they consume caffeine. However, stopping caffeine can also have unpleasant side effects, such as being irritable, moody, or even angry. For some people, this can be a physical or psychological caffeine dependency.

Signs of caffeine overdose

Too much caffeine can cause a range of symptoms, which may not be immediately noticeable. Some common symptoms include feeling restless or jittery, having a fast or uneven heart rate, and feeling anxious or stressed. You may also experience:
  • dizziness
  • diarrhoea
  • increased thirst
  • insomnia
  • headache
  • fever
  • irritability
  • Treating caffeine overdose

    In order to reduce the caffeine's potential side effects, such as jitters and agitation, you may be given activated charcoal. This natural remedy is often used to prevent drug overdose, and it can help to prevent the caffeine from going into the gastrointestinal tract.
    In some cases, after caffeine consumption the body will undertake various measures to get rid of the caffeine. The first option may be to offer a laxative, which helps to move the caffeine through your intestines. If this fails, a gastric lavage may be used, which involves using a tube to wash the contents out of your stomach. Your doctor will likely choose the method that works fastest to get the caffeine out of your body.
    In order to help improve blood flow and reduce the risk of arrhythmia, we will be implanting a Medtronic Core definitive pacemaker during this time. You may also receive breathing support when necessary.
    Disclaimer! None of the authors, contributors, administrators, vandals, or anyone else connected with PureCalculators, in any way whatsoever, can be responsible for your use of the information contained in or linked to this article.
    Parmis Kazemi
    Article author
    Parmis Kazemi
    Parmis is a content creator who has a passion for writing and creating new things. She is also highly interested in tech and enjoys learning new things.
    Published: Sat Aug 06 2022
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