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Use our Isotretinoin Dose Calculator to check daily dose math, total drug use, and dose per kg with clear formulas and examples.
| Parameter | Commonly-Cited Value | Important Caveat |
|---|---|---|
| Cumulative Target | 120 - 150 mg/kg (historical reference) | Originates from 1990s-era acne literature and subsequent guidelines (e.g. Am Fam Physician 2001;63(7):1296). More recent dermatology sources report the evidence behind this specific range is weak/disputed, and treating to clinical clearance rather than a fixed number is increasingly favored. Not a mandatory target for every patient -- enter your own clinician-selected value. |
| Typical Daily Dose Range | 0.1 - 1.0 mg/kg/day (commonly cited range) | Individualized by the prescriber; this calculator does not select or validate a dose as appropriate. |
Want to check an isotretinoin dose? Our Isotretinoin Dose Calculator makes the math simple. It helps you work with body weight, daily dose, and total drug use.
Enter your values to see the results. You can use pounds or kilograms. You can also add a dose target or past drug use.
This tool does not set your dose. Always follow your prescriber's advice.
This tool helps you check dose math for acne care. It uses your weight and the dose set by your prescriber.
It can show your daily dose in mg per day. It can also show a target total, drug use to date, and dose per kg.
Think of it like a budget tool. It adds the values you enter. It does not tell you what you should spend or take.
The calculator uses these core formulas.
Weight in kg = Weight in lb ÷ 2.20462
For a dose set per kg:
Daily dose (mg/day) = Weight (kg) × Dose (mg/kg/day)
If your prescriber gave a dose in mg per day, the tool uses that value as entered.
Target total (mg) = Weight (kg) × Target (mg/kg)
This target is optional. Your prescriber must choose the right goal for your care.
Total taken (mg) = Daily dose (mg/day) × Days taken
This method assumes the same dose each day. It does not account for missed doses or dose changes.
You can also enter a known total in mg.
Dose per kg = Total taken (mg) ÷ Weight (kg)
Target gap (mg) = Target total (mg) − Total taken (mg)
The gap is a math result, not advice to take more medicine.
1. Enter your weight. Choose kg or lb. Check the value before you continue.
2. Choose the dose mode. Use the dose per kg mode or enter a daily dose set by your prescriber.
3. Add the dose value. Enter the value and unit shown on your prescription.
4. Choose a total mode. Enter the days taken, add a known total, or skip this part.
5. Review the results. Check each value and its formula. Ask your prescriber if you have any doubts.
Here is a math example with made-up values.
Weight = 60 kg
Dose entered = 0.5 mg/kg/day
Days taken = 30
Target = 120 mg/kg
Daily dose = 60 × 0.5 = 30 mg/day.
Target total = 60 × 120 = 7,200 mg.
Total taken = 30 × 30 = 900 mg.
Dose per kg = 900 ÷ 60 = 15 mg/kg.
Target gap = 7,200 − 900 = 6,300 mg.
These figures only show how the math works. They do not set a dose or treatment plan. Never change your dose based on this example.
Our Isotretinoin Dose Calculator helps make dose math clear. It can show daily dose, total drug use, and dose per kg. It also lets you check a target set by your prescriber.
Isotretinoin can cause severe birth defects. Pregnancy safety steps and medical checks are vital. Use this tool for math only. Your prescriber must guide your care.
It works out daily dose math and, when data is entered, total drug use and dose per kg.
Yes. The tool converts pounds to kg before it works out a dose per kg.
No. It uses the dose you enter. Only your prescriber can set or change your dose.
Yes. Choose the manual total mode and enter the total in mg.
No. The gap is only a math result. Do not change your dose without advice from your prescriber.