Free Adderall Dosage Calculator

The Adderall Dosage Calculator is a practical online tool designed to help patients, caregivers, and healthcare professionals determine an appropriate starting dose of Adderall (amphetamine/dextroamphetamine) for both children and adults. It covers the two primary indications — attention deficit hyperactivity disorder (ADHD) and narcolepsy — and handles both immediate-release tablets and the extended-release formulation Adderall XR. While the calculator provides evidence-based dosing guidance, it is not a substitute for a physician's clinical judgment; any decisions about medication should always be made in consultation with a qualified medical professional.

What Is Adderall and How Does It Work?

Adderall is a branded medication that contains a mixture of amphetamine and dextroamphetamine — the same class of substances found in certain illicit stimulants. Despite this chemical kinship, when used under medical supervision, Adderall is a registered treatment for two distinct conditions:

• Narcolepsy: A neurological disorder marked by sudden loss of muscle control (cataplexy), sleep paralysis, hallucinations, and involuntary daytime sleep episodes. Because Adderall stimulates the central nervous system, it helps people with narcolepsy stay awake and alert during the day.
• ADHD: A condition characterized by persistent inattention, hyperactivity, and impulsivity. Although giving a stimulant to an already hyperactive child may seem counterintuitive, research shows that Adderall improves focus, reduces impulsive behavior, and enhances attention span in many individuals with ADHD.

The therapeutic effects are linked to the release of two key neurotransmitters: dopamine and norepinephrine. In people with ADHD, the brain often has lower-than-normal levels of these chemicals; the extra release induced by Adderall helps compensate for that deficit, alleviating core symptoms.

Important Safety Information

Like any potent medication, Adderall carries risks. It can be habit‑forming, is frequently misused, and abrupt discontinuation may cause withdrawal symptoms. Overdose is possible — the lethal dose of amphetamine is roughly 20–25 mg per kilogram of body weight. For a 70 kg (≈154 lb) person, that would be more than 1400 mg of amphetamine, which is about 50 times the standard daily dose.
Common side effects include insomnia, blurred vision, dilated pupils, chest pain, sweating, dry mouth, dizziness, headache, stomachache, nausea, constipation, and in some cases psychosis or allergic reactions. Cardiovascular events such as hypertension, tachycardia, heart attack, and stroke have been reported; emergency services should be contacted immediately if any serious symptoms occur.

Adderall Dosage for Children

Dosing for children depends on age, indication, and whether the immediate-release (IR) tablet or the extended-release (XR) capsule is used. The general rule is to start with the lowest possible effective dose, administer the first dose upon waking, and space subsequent doses (for IR) 4–6 hours apart.

ADHD — Immediate-Release Tablets

Age	Starting Dose	Dose Increase
3–5 years	2.5 mg	2.5 mg once weekly
6–17 years	5 mg	5 mg once weekly

May be taken once or twice daily.

ADHD — Adderall XR (Extended‑Release)

Age	Starting Dose	Dose Increase
6–12 years	5 mg	5 mg once weekly
13–17 years	10 mg	May be increased to 20 mg after one week

Taken once daily in the morning.

Narcolepsy

Age	Starting Dose	Dose Increase
6–11 years	5 mg	5 mg once weekly
12–17 years	10 mg	10 mg once weekly

Taken once daily.

Adderall Dosage for Adults

Adult dosing follows similar patterns but with different starting points.

ADHD — Immediate-Release Tablets

Starting Dose	Dose Increase
5 mg	5 mg once weekly

Typically taken once or twice daily.

ADHD — Adderall XR

Starting Dose	Dose Adjustment
20 mg	Individualized

Taken once daily.

Narcolepsy

Starting Dose	Dose Increase
10 mg	10 mg once weekly

Taken once daily.

Maximum Adult Doses

• ADHD: 40 mg per day
• Narcolepsy: 60 mg per day

How to Calculate the Number of Tablets

Once the appropriate starting dose is identified, you can quickly determine how many tablets are needed using a simple formula:

$$\text{Number of tablets} = \dfrac{\text{Starting dose}}{\text{Tablet strength}}$$

Available tablet strengths include 5 mg, 7.5 mg, 10 mg, 12.5 mg, 15 mg, 20 mg, and 30 mg. Choose the strength that most closely matches the desired dose. The Adderall Dose Calculator automates this calculation, making it easy to verify the right number of tablets for any prescribed starting dose.

Practical Tips for Safe Dosing

• Always use the lowest effective dose and adjust only under medical supervision.
• For children, dosing is weight‑based and age‑specific; the calculator’s built‑in charts reflect current clinical guidelines.
• Extended‑release (XR) formulations are taken once daily, while immediate‑release tablets may require a second dose after 4–6 hours.
• Never combine Adderall with other stimulants or alcohol without a doctor’s approval.
• Regular monitoring by a healthcare provider is essential, especially during the first few weeks of treatment.

This tool is designed to provide quick reference dosing information based on standard medical recommendations. However, individual responses vary, and only a doctor can determine the optimal dose for a specific patient.