What do BED and EQD2 mean in radiation therapy?

BED (Biologically Effective Dose) quantifies the biological effect of a radiation schedule, while EQD2 (Equivalent Dose in 2-Gy fractions) converts that dose to what a standard 2-Gy-per-fraction schedule would produce, allowing comparison between different fractionation schemes.

Do I need to know the alpha-beta ratio to use these calculators?

Yes, the alpha-beta ratio is essential; it represents the sensitivity of the tissue being treated and determines how much biological effect a given dose delivers. Most calculators require this value, and some provide reference ranges for common organs.

Can I compare more than one treatment plan at a time?

Some tools, like Bayta Systems, allow you to input and compare up to five different dose/fractionation plans simultaneously, which is useful when evaluating multiple clinical options side by side.

Is it necessary to install software or pay for these calculators?

No, all the tools listed are free web-based calculators that run in your browser without requiring a paid plan or software installation.

What should I do if the calculator gives me a result that seems too high or too low?

Double-check that you have entered the correct dose per fraction, total number of fractions, and the appropriate alpha-beta ratio for the tissue in question. If the result still seems unexpected, consult a radiation oncologist or medical physicist for interpretation.

Medical & Clinical6 options compared

BED Calculator

Calculates biological dose equivalents for evaluating radiation therapy treatment plans using BED (Biologically Effective Dose) and EQD2 methods. Users input specific parameters such as the dose delivered per fraction, the total number of fractions planned, and the alpha-beta ratio into the tool. The calculator then processes these variables to provide a quantitative comparison of different...

Radiology calculators

Editors’ Top PickBased on community votes

Omni Calculator

omnicalculator.com

The BED calculator allows you to compute the biologically effective dose and the equivalent total dose in 2-Gy fraction.

Open Omni Calculator Read review →

Other OptionsRanked by votes

02
02
Bayta Systems
bayta.us
This free web tool calculates BED and EQD2 based on total dose and fractionation schema. It allows comparing up to fi...
Open site View details
03
03
Radformation
radformation.com
This free BED calculator computes biologically effective dose (BED) and equivalent dose in 2 Gy fractions (EQD2). It ...
Open site View details
04
04
MDApp
mdapp.co
This calculator provides BED and EQD2 outputs using linear-quadratic radiobiology formulas. It supports irradiation d...
Open site View details
05
05
Solutio in silico
solutioinsilico.com
Its Biological Dose Calculator is a free online tool for BED and EQD2-style radiobiological dose comparisons. Users i...
Open site View details
06
06
EQD2 Rechner
eqd2rechner.de
The site includes an EQD2 and BED calculator with explicit formulas and variable definitions. Users can enter fractio...
Open site View details

Side by side

BED Calculator options compared

Tool	Best for	Strengths	Limitations
Omni Calculator omnicalculator.com	Quick single-plan BED calculation	Simple input fields Immediate BED and EQD2 output	No plan comparison Basic design only
Bayta Systems bayta.us	Comparing multiple fractionation plans	Up to five plans side by side Editable alpha/beta ratios No subscription required	Interface is less polished than Omni Fewer visual aids
Radformation radformation.com	Clinicians who want reference alpha/beta ranges	Built-in alpha/beta reference values for organs Citations and disclaimer included	No multi-plan comparison feature Smaller community votes
MDApp mdapp.co	Users who need custom alpha/beta values and multiple ratio comparisons
Solutio in silico solutioinsilico.com	Free BED/EQD2 comparisons without mandatory account
EQD2 Rechner eqd2rechner.de	German-language EQD2 and BED calculations with explicit formulas

Buyer's guide

How to choose a bed calculator

When picking a BED calculator, first decide whether you need to evaluate a single treatment plan or compare several schemes side by side. If you only need one result quickly, a tool with simple dose-per-fraction and alpha/beta inputs will give you BED and EQD2 without extra steps. If you are evaluating multiple fractionation strategies, look for a calculator that lets you input and toggle between different plans and alpha/beta ratios in one view. Accuracy depends on using the correct alpha/beta ratio for the tissue being modeled, so choose a tool that either lists reference ranges or lets you enter your own value.

Questions

BED Calculator FAQ

What do BED and EQD2 mean in radiation therapy?: BED (Biologically Effective Dose) quantifies the biological effect of a radiation schedule, while EQD2 (Equivalent Dose in 2-Gy fractions) converts that dose to what a standard 2-Gy-per-fraction schedule would produce, allowing comparison between different fractionation schemes.
Do I need to know the alpha-beta ratio to use these calculators?: Yes, the alpha-beta ratio is essential; it represents the sensitivity of the tissue being treated and determines how much biological effect a given dose delivers. Most calculators require this value, and some provide reference ranges for common organs.
Can I compare more than one treatment plan at a time?: Some tools, like Bayta Systems, allow you to input and compare up to five different dose/fractionation plans simultaneously, which is useful when evaluating multiple clinical options side by side.
Is it necessary to install software or pay for these calculators?: No, all the tools listed are free web-based calculators that run in your browser without requiring a paid plan or software installation.
What should I do if the calculator gives me a result that seems too high or too low?: Double-check that you have entered the correct dose per fraction, total number of fractions, and the appropriate alpha-beta ratio for the tissue in question. If the result still seems unexpected, consult a radiation oncologist or medical physicist for interpretation.

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