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Radiation Absorbed Dose Converter (Gy / rad)

· Last updated：2026-08-01

Convert radiation absorbed dose between Gy (gray = J/kg, SI base), kGy (1 = 1000 Gy), cGy (1 = 0.01 Gy), mGy (1 = 0.001 Gy), and rad (1 = 0.01 Gy). Converts via Gy to the target unit and lists the equivalent value in all five units. ⚠️ Absorbed dose is NOT equivalent dose: converting Gy → Sv requires multiplying by the radiation weighting factor w_R (X/γ/β = 1, neutrons 5–20, alpha 20) — use the dose-equivalent converter for that side. Reference values: chest X-ray ≈ 1e-4, CT scan ≈ 1e-2, radiotherapy fraction ≈ 2, whole-body LD50/60 ≈ 4–6 Gy.

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Written by the Elysia Tools team

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Math & Numbers
Input types
select, number
Output type
json
Sample coverage
4
API ready
Yes

Overview

Convert a non-negative radiation absorbed dose between Gy, kGy, cGy, mGy, and rad. Enter a value, choose the input and output units, and receive the converted result plus equivalent values in all five units.

When to use

  • Convert radiology or radiation measurements between Gy, mGy, cGy, kGy, and rad.
  • Check radiotherapy dose values expressed in cGy against their equivalent in Gy or rad.
  • Standardize absorbed-dose values for calculations, reports, or technical comparisons.

How it works

  1. 1Enter a non-negative absorbed-dose value.
  2. 2Select the input unit and the desired output unit.
  3. 3Choose the number of decimal places from 0 to 10.
  4. 4The converter uses Gy as the basis and returns the selected conversion along with all five unit equivalents.

Use cases

  • Radiology teams can compare CT or X-ray dose values across Gy, mGy, and rad.
  • Radiotherapy staff can convert treatment fractions from cGy to Gy.
  • Students and technical professionals can verify radiation-dose unit relationships.

Examples

1. Convert a CT scan dose from Gy to rad

Radiology student

Background

A reference value lists a CT scan absorbed dose as approximately 0.01 Gy, but the comparison table uses rad.

Problem

Find the equivalent dose in rad and confirm the related cGy and mGy values.

How to use

Enter 0.01 as the value, select Gy as the input unit, rad as the output unit, and keep 6 decimal places.

Input unit: Gy; Value: 0.01; Output unit: rad; Decimal places: 6

Outcome

The result is 1 rad, with equivalent values of 0.01 Gy, 0.00001 kGy, 1 cGy, and 10 mGy.

2. Convert a radiotherapy fraction from cGy to Gy

Radiotherapy trainee

Background

A treatment fraction is recorded as 200 cGy, while another document reports doses in Gy.

Problem

Convert the treatment value to Gy and review its equivalents in the other supported units.

How to use

Enter 200 as the value, select cGy as the input unit, Gy as the output unit, and choose 6 decimal places.

FAQ

Which units does this converter support?

It supports Gy, kGy, cGy, mGy, and rad.

What does 1 rad equal?

1 rad equals 0.01 Gy, 1 cGy, or 10 mGy.

How many Gy are in 200 cGy?

200 cGy equals 2 Gy.

Can this tool convert absorbed dose to Sv?

No. Sv is equivalent dose and requires a radiation weighting factor, so use a dose-equivalent converter.

What values can I enter?

Enter a non-negative numeric absorbed-dose value.

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Input unit: cGy; Value: 200; Output unit: Gy; Decimal places: 6

Outcome

The result is 2 Gy, equivalent to 0.002 kGy, 200 cGy, 2000 mGy, and 200 rad.