Adderall Dosage Calculator

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FDA dosing guidelines differ by age group. Children under 3 are outside the approved indication.
Adderall is FDA-approved for ADHD (all listed age groups) and narcolepsy (ages 6 and up).
IR tablets last 4-6 hours and are taken 2-3 times daily. XR capsules last 10-12 hours and are taken once daily. Note: XR is not FDA-approved for narcolepsy.
Enter your current single-dose strength to see how it compares to the typical range. Leave at 0 or enter the starting dose to begin titration tracking.
mg
Select the strength of tablet or capsule you have. The calculator will show how many units equal the starting dose.
Recommended starting doseNear maximum
5mg

FDA-recommended starting single dose for this age group and indication

Weekly titration step5mg
Maximum daily dose40mg
Doses per day3
Duration of effect5hours
Tablets for starting dose0.5
Full clearance time (5 half-lives)57.5hours
Effective half-life11.5hours
Your current total daily dose30mg/day
Current dose vs. starting dose10 mg - approximately 1 titration step above start (30 mg/day across 3 doses)
5 mg
Low start<10Moderate10-30High30-40Maximum40+

Starting dose: 5 mg. Maximum: 40 mg/day.

  • The recommended starting dose is 5 mg. If response is insufficient, the dose can be increased by 5 mg each week.
  • The maximum daily dose for this group is 40 mg. Doses above this threshold rarely provide additional benefit and increase side-effect risk.
  • Each IR dose lasts approximately 5 hours, so 3 doses per day are spaced throughout the morning and early afternoon to avoid sleep disruption.

Next stepAlways follow your prescriber's specific instructions. Dosing should be titrated based on individual response and tolerability, not based on published maximums alone.

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