# Radiation Absorbed Dose Converter (Gy / rad) 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. > Canonical page: https://elysiatools.com/en/tools/radiation-absorbed-dose-converter - **Category:** Math & Numbers - **Keywords:** absorbed dose, radiation dose conversion, gray, Gy, rad, cGy, mGy, kGy, ionizing radiation, J/kg, radiotherapy, radiology ## 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. ## Inputs - **Input unit** (select) - **Value** (number): Absorbed dose in the selected Input unit. Must be non-negative. - **Output unit** (select) - **Decimal Places** (number) ## 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 - Enter a non-negative absorbed-dose value. - Select the input unit and the desired output unit. - Choose the number of decimal places from 0 to 10. - The 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. ## Frequently asked questions ### 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. ## Related tools - [Air Changes per Hour (ACH, n = Q/V)](https://elysiatools.com/en/tools/air-changes-per-hour): Compute the air change rate (ACH / n) of a room from the outdoor supply airflow Q and the room volume V: n = Q/V (1/h). Three modes: solve ACH (given Q and V), solve airflow (given n and V), or solve volume (given n and Q). Flow in m³/s/m³/h/CFM, volume in m³/ft³/L. 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