Phototherapy Dose Calculator
Calculate narrowband UVB phototherapy dosing based on skin type, treatment number, and erythema response.
Medical Disclaimer
This calculator is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about your health. Never disregard professional medical advice or delay seeking it because of results from this tool.
Inputs
Results
Recommended Dose
220mJ/cm²
Exposure Time
22sec
How to Use This Calculator
- Select the patient's Fitzpatrick Skin Type to set the starting dose.
- Enter the current Treatment Session number and Last Dose.
- Select the Erythema Response from the previous session (none, minimal, moderate, brisk).
- Enter Days Since Last Treatment to apply the missed-session dose reduction protocol.
- Review Recommended Dose and Exposure Time (sec) for the current session.
What each input means
- Fitzpatrick Skin Type
- Determines starting dose and limits.
- Treatment Session #
- Current session number.
- Last Dose
- Previous session dose. 0 for first treatment.
- Erythema Response
- 0=none, 1=minimal pink, 2=definite pink, 3=painful.
- Days Since Last Treatment
- Standard is 2-3 times/week.
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersFitzpatrick Skin Type = 2, Treatment Session # = 1, Last Dose = 0, Erythema Response = 0 = 5 input(s) provided
- Calculate Recommended Dose220 = 220
- Calculate Exposure TimeExposure Time = currentDose / lampIrradiance22 = 22
- Calculate Protocol Start DoseProtocol Start Dose220 = 220
- Calculate Maximum DoseMaximum Dose2000 = 2000
Related Calculators
The questions that sit next to this one — chosen by subject, including calculators filed under a different category.
PASI Score Calculator
Calculate the Psoriasis Area and Severity Index (PASI) to quantify psoriasis severity across four body regions.
DermatologyFitzpatrick Skin Type Calculator
Classify your skin type (I–VI) based on genetic disposition and sun reaction to determine UV sensitivity, burn risk, and SPF recommendations.
TerrariumUVB Coverage Calculator
UVB lamp distance and replacement schedule.
DermatologyMelanoma Risk Calculator
Estimate relative melanoma risk based on skin type, mole count, family history, sunburn history, and other established risk factors.
More in Medical & Clinical.