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Calcimator

Radiation Therapy Dose Calculator

Calculate dose per fraction, BED (biologically effective dose), EQD2, treatment duration, and weekly dose for radiation therapy planning.

Inputs

Results

Dose per Fraction

2 Gy

BED (Biologically Effective Dose)72 Gy
EQD2 (Equivalent in 2 Gy fractions)60 Gy
Total Treatment Duration42 days
Weekly Dose10 Gy/week
How to Use This Calculator
  1. Enter the total prescribed radiation dose in Gray (Gy).
  2. Input the number of fractions in the treatment plan.
  3. Set the treatment days per week.
  4. Select the tumor type or tissue sensitivity.
  5. Review the dose per fraction, BED (Biologically Effective Dose), and EQD2 for radiobiology assessment.

How the result changes with Total Prescribed Dose (Gy)

Total Prescribed Dose (Gy)Dose per Fraction
110.37 Gy
361.2 Gy
652.17 Gy
903 Gy

What each input means

Total Prescribed Dose (Gy)
Total radiation dose prescribed for the full course of treatment.
Number of Fractions
Total number of treatment sessions. Standard: 25-35 fractions.
Treatment Days per Week
Number of treatment days per week. Standard: 5 (Monday-Friday).
Tumor Type
1 = prostate (α/β=1.5), 2 = breast (α/β=4), 3 = head/neck (α/β=10), 4 = lung (α/β=10).
Normal Tissue Constraint (Gy)
Maximum acceptable dose to adjacent normal tissue.

What each result means

BED (Biologically Effective Dose)
Accounts for fractionation effects on tumor cell kill.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Total Prescribed Dose (Gy) = 60, Number of Fractions = 30, Treatment Days per Week = 5, Tumor Type = 3 = 5 input(s) provided
  2. Calculate Dose per Fraction
    Dose per Fraction
    2 = 2
  3. Calculate BED
    BED
    72 = 72
  4. Calculate EQD2
    EQD2
    60 = 60

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Unit Conversion Expanded

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