Loading the page...
Preparing tools and content for you. This usually takes a second.
Preparing tools and content for you. This usually takes a second.
Fetching calculator categories and tools for this section.
Choose common immediate-release adult strengths (0.5–10 mg) or explore a capped mg/kg illustration for older children and adolescents with clinician context. A separate dropdown only adjusts timing language for insomnia vs jet lag vs shift work themes—not a full circadian model. This is educational, not a prescription, not a substitute for your product label, and not pediatric specialty care. Browse more medical & health calculators.
Last updated: April 20, 2026
Need a white-label dosing education widget? Get a Quote
Matches common immediate-release OTC-style strengths; your product label is authoritative.
Illustrative single dose
3 mg
Timing & context
Typical teaching: take 30–60 minutes before desired sleep onset with consistent sleep hygiene; start low and reassess morning grogginess.
Melatonin can cause drowsiness; do not drive or operate machinery if sedated. Seek emergency care for allergic reactions, new severe mood changes, or unexpected neurologic symptoms. This tool does not check your medication list.
Mirrors how consumers read bottle labels (0.5–10 mg) while reinforcing “start low, watch morning sedation” teaching from many sleep clinics.
Weight-based bands (0.05–0.15 mg/kg) support pharmacology discussions; output is rounded to 0.5 mg and limited to a conservative single-dose cap for unsupervised teaching tools.
Emphasizes taking melatonin before target sleep onset alongside stimulus control—not as a substitute for cognitive behavioral therapy for insomnia when indicated.
Notes that eastward vs westward schedules differ and that light exposure timing often matters as much as milligrams—this page does not generate a travel protocol.
Shift workers may be instructed to use melatonin before daytime sleep or before a night shift depending on protocol—occupational health guidance supersedes any consumer calculator.
Static disclaimers highlight pregnancy, epilepsy, depression, anticoagulation, and sedation risks; users must still complete a real medication review with professionals.
Default demo: Adult, 3 mg, sleep-onset insomnia → illustrative dose 3 mg with bedtime-window timing text (verify your exact product and label).
Physiologic nocturnal melatonin is typically well below many retail tablet strengths; effective clinical doses are not always proportional to bottle size. Higher doses can increase morning grogginess without guaranteed benefit—use shared decision-making with a clinician.
In adult mode, the selected milligram strength is returned directly as the illustrative dose—mirroring how a user reads a supplement Facts panel—while narrative notes discuss starting doses, next-day sedation, and brand variability. In child mode, body weight converts to kilograms, multiplies by your chosen teaching mg/kg factor, rounds to the nearest 0.5 mg, then applies a fixed cap for unsupervised teaching scenarios.
doseMg = min(cap, round₀.₅(weightKg × mg/kg))Weights under ~10 kg and over 120 kg return errors because this consumer tool is not designed for neonatal prescribing or bariatric specialty titration.
Screen for obstructive sleep apnea symptoms with our sleep apnea risk calculator before assuming melatonin alone will fix excessive daytime sleepiness.
Get a Custom Calculator for Your PlatformIllustrative result: 4 mg single dose
A real pediatrician might choose a different strength, formulation, or even non-pharmacologic treatment first—this numeric match is coincidental, not endorsement.
Share it for sleep-hygiene and circadian teaching
Suggested hashtags: #Melatonin #SleepHealth #Circadian #MedEd #Calculator