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Melatonin Dosage Calculator

Melatonin Dosage Calculator

Select your indication and medication type and also enter therapy duration. This free melatonin dosage calculator lets you know the exact amount of melatonin drug you require to take under indications selected.


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An online melatonin dosage calculator estimates how much melatonin dosage by weight and age should be taken in a certain condition. The best thing about this melatonin calculator is it displays relative amounts of dosage for various medication types in which it is taken.

Read through the article below to get a proper knowledge about how much melatonin you should take and what exactly this drug is!

Keep scrolling!

What Is Melatonin?

“Melatonin is a specific fluid that is secreted in the brain to create a sensation of sleep in the body”

Major Source of The Melatonin:

Various tissues in the body produce this naturally synthesized drug, but the major source of its secretion is pineal gland. At night, this particular gland releases a sufficient amount of this drug in your brain to make you feel sleepy and take rest. This gland produces melatonin by using amino acid tryptophan as a resource. If in case you are subjected to a certain medical condition, then your brain refuses to create this fluid due to which you feel difficulty in sleeping.

pineal gland

This is why you must consult a doctor to take artificially manufactured melatonin to take a proper rest. Also, you can use our free weight melatonin dosage calculator to instantly estimate how much intake of this drug you should intake.

Well, you must take into consideration what amount of the melatonin you should intake on a daily basis to enjoy a better sleep. For an instant estimation, you can use free age melatonin dosage calculator to know your sufficient body need for this drug. But you must visit your physician before you actually start taking this medicine.

How Much Melatonin Should You Take?

Usually, people suffering from any medical illness take this medicine to reduce the pain and fatigue due to certain conditions. However, it should also be noted that deviations in the amount of this drug affects your body differently.

How Much Melatonin Should An Adult Take?

Basically, the rule of thumb states that you should always start with intaking a little amount of melatonin and then increase it according to your needs. But when it comes to how much melatonin can an adult take, the answer is 0.3 mg to 12 mg. But melatonin dosage for adults 10mg is the best amount you should consume to enjoy a good sleep. If you are having no medical issue but trouble in getting a sleep, then exceeding 12mg of this medicine may harm you in any way.

For a better prescription, use an online melatonin dosage calculator and then see your doctor and he/she will tell you how much melatonin for adults is prescribed according to age and weight.

How Much Melatonin Should A Woman Rake During Pregnancy?

During pregnancy, an optimal melatonin dose for a woman carrying a baby is about 1-3 mg. Exceeding this limit may harm the baby’s health and disturb the mother too. That is why it is a preferable choice to consult a gynaecologist to avoid any inconvenience in future or even during delivery time.

Melatonin Dosage Chart For Adults:

Below is the summarised representation of how many mg of melatonin you should consume in case you are fully grown up and bearing certain conditions.

Indication Recommended Administration
Trouble falling asleep 0.3 – 5 mg Daily, 30 min-1 hr before sleep (for up to 9 months)
Disrupted Sleep & Wake Cycle 2 – 12 mg Daily, 30 min-1 hr before sleep (for up to 4 weeks)
Extended difficulty sleeping 2 – 3 mg Daily, 30 min-1 hr before sleep (for up to 29 weeks)
Blood pressure support 2 – 3 mg of controlled-release melatonin Daily, 30 min-1 hr before sleep (for up to 4 weeks)
Jetlag 0.5 – 8 mg At bedtime, commonly taken starting the night of arrival at your destination, continuing for 2 to 5 days
Sleep cycle disorders in blind people 0.5 – 5 mg Around 9-10 PM, before going to sleep.
Beta-blockers insomnia 2.5 mg Daily, 30 min-1 hr before sleep (for up to 4 weeks)
Endometriosis 10 mg Daily, 30 min-1 hr before sleep (for up to 4 weeks)

Melatonin For Kids Dosage:

Kids’ bodies are highly affected by drug intake. But in case your kid is suffering from any medical difficulty that causes hurdles in their sleep, then a relative amount of melatonin upto 5 mg should be given to them. But a better practice is to start from a very minimum dose and increase it according to the need.

Melatonin Dose Chart For Kids:

Usage Dose Length
Insomnia 5 mg or 0.05 mg/kg to 0.15 mg/kg of body weight at bedtime 4 weeks has been used in children 6 to 12 years-old with primary insomnia.

For secondary insomnia, 6 mg to 9 mg, taken before bedtime for 4 weeks, has been used in children 3 to 12 years-old.

Sleep problems related to sleep-wake cycle disturbances 0.5 mg to 12 mg of melatonin daily 12 weeks has been used in children and adolescents 3 months to 17 years-old
Trouble falling asleep 1 mg to 6 mg before bed Up to 1 month
Sleep disorders in blind people 0.5 mg to 4 mg of melatonin daily Up to 6 years
Reducing anxiety before surgery 0.05 mg/kg to 0.5 mg/kg of body weight children 1 to 8 years-old.


Melatonin Dosage By Weight:

Melatonin drug is taken when this specific fluid is not created by your brain. But there is a variation in its intake according to your body mass. If you take more than the said amount corresponding to your body weight, then it will strongly affect you in various ways. Usually for adults, melatonin intake by considering the weight is prohibited because if your weight is very much, then you may accidentally take a heavy dose that may harm you badly.

But for children, melatonin can be given by taking into account their weight.

Weight Melatonin Dosage Chart By Age For Children:

Below is the chart that indicates the relative amount of melatonin intake related to child’s weight.

Child’s Weight How Much Melatonin Is Safe?
Less than 88 pounds Maximum Melatonin Dosage: 3 mg
More than 88 pounds Maximum Melatonin Dosage: 5 mg

Benefits of Melatonin:

Melatonin is produced at the base of your brain and controls the times of your active and passive body conditions i.e; it controls your circadian rhythms. Apart from the fact that this particular fluid is known for its best results, there are many other advantages of using this drug artificially that may include the following:

Jet Lag Management:

jet lag
Whenever you travel in between different time zones, it disturbs your sleep a lot. With the adjustment of the circadian rhythms, jet lag manages itself automatically. But for keeping your sleep-wake cycle smooth, intake of melatonin is always prescribed.

Improving Antioxidants Efficiency:

radical damage
The fluid melatonin always goes for stimulating the antioxidants enzymes that further take part in improving the efficiency of other antioxidants. These antioxidants fight against the free radical damage that keeps the cells from getting damaged.

Boosting Immune System:

boost immune system
Besides keeping the antioxidants strong enough to carry out various activities, melatonin also keeps your immune system strong enough to fight against diseases. It has been confirmed that this fluid acts as the immune system buffer and keeps your body in a good health.

Relieves Stress:

releive of stress
Here one would think that how much melatonin should i take during the stress condition?
But do not worry at all as we are here to help you out! Use our free melatonin calculator and consult with your physician to take the right dosage of this drug to keep your stress away. Melatonin always takes control over your emotions and allows you to stay relaxed even during stress conditions.

Improves Cardiovascular Tissues Health:

cardiovascular muscles health
According to a study, it has been noted that melatonin helps keep the blood pressure of your body low thus increasing the heart muscles’ health. Generally during morning hours, your brain produces less melatonin to keep you awake. But when night hours come by, this release in the melatonin is increased.

Effects of Melatonin:

In most cases, melatonin does not affect the body as this fluid is also produced naturally. But when you overdose, you may feel the following side effects:

For Adults:

  • Anxiety and depression
  • Nausea
  • Weird dreams
  • Drowsiness during daytime
  • Variations in the blood pressure

For Children:

Morning drowsiness is the most common side effect of the melatonin that has been noticed so far. Also, some other may include:

  • Headache
  • Nausea
  • Wetting the bed
  • Neurological disorders that may increase chances of seizures among children

How Melatonin Dosage Calculator Works?

This free melatonin calculator takes a couple of clicks to display an estimation about your daily melatonin dosage intake. Let’s find how!


  • First of all, make a considerable selection if you are having any medical condition from the first drop down list
  • After doing so, select in which medication form you want to take this particular drug
  • Now write down duration number
  • From the next list, select either weeks, days, months, or years against the above number to confirm your duration of the therapy
  • Now tap the calculate button


The free calculator does the following calculations:

  • Estimated amount of the melatonin on a daily basis
  • Displays time of taking this medicine
  • Dosage schedule for continuous 5 days therapy


Is taking melatonin safe?

Yes, taking melatonin is safe but only if its therapy comprises a short duration. If you go beyond short term intake, you may feel headache and other side effects.

What are some best vitamins to be taken for a good sleep?

The vitamins that help you take a good sleep include:

  • Magnesium
  • Melatonin
  • Vitamin D
  • Chamomile
  • Calcium
  • Potassium
  • Valerian root
  • Vitamin E

What vitamin lack can actually cause insomnia?

The sensation of insomnia is actually caused due to the deficiency of vitamin B6. This vitamin creates serotonin and melatonin secretions in the body for a healthy sleep.

Which vitamins keep you awake at night?

B complex vitamins keep you awake through the whole night.


Melatonin supports continuous support for keeping your circadian rhythms smooth. It makes you feel sleepy at the time when your body needs rest. But when its supply gets shorted or blocked, you need to take it artificially to manage your proper sleep. That is why you are advised to make use of the free online weight melatonin dosage calculator for a better estimation of the medicine.


This melatonin dosage calculator is designed only for educational purposes. You are asked not to rely on the results generated by this calculator because it may contain errors. For a better prescription and verification of dosage limit, do consult with a specialist.


From the source of Wikipedia: Melatonin, Sleep disorders, Dementia, Jet lag and shift work, Adverse effects, Circadian rhythm, Biosynthesis, Pharmacology

From the source of Khan Academy: Psychoactive drugs, Stimulants, Hallucinogens, Drug dependence and homeostasis, Routes of drug entry, Substance use disorders

From the source of Lumen Learning: Sleep Problems and Disorders, Parasomnias, Insomnia, Sleep Apnea, SIDS, Narcolepsy,