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.

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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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.

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2 examples

CT scan: 0.01 Gy → rad = 1

0.01 Gy ÷ 0.01 = 1 rad = 1 cGy = 10 mGy. Typical single CT slice absorbed dose.

{"result":"0.01 Gy = 1 rad. All units: Gy=0.01, kGy=0.00001, cGy=1, mGy=10, rad=1.","metadata":{"input":{"inputUnit":"Gy","value":0.01,"outputUnit":"rad"},"result":{"outputValue":1,"outputUnit":"rad","Gy":0.01,"kGy":0.00001,"cGy":1,"mGy":10,"rad":1}}}

Radiotherapy: 200 cGy → Gy = 2

200 cGy × 0.01 = 2 Gy = 200 rad. Standard daily radiotherapy fraction dose.

{"result":"200 cGy = 2 Gy. All units: Gy=2, kGy=0.002, cGy=200, mGy=2000, rad=200.","metadata":{"input":{"inputUnit":"cGy","value":200,"outputUnit":"Gy"},"result":{"outputValue":2,"outputUnit":"Gy","Gy":2,"kGy":0.002,"cGy":200,"mGy":2000,"rad":200}}}

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4 options

SettingsAdjust formats, ranges, numbers, and modes.4

Input unitselectOptionalValuenumberRequiredAbsorbed dose in the selected Input unit. Must be non-negative.Output unitselectOptionalDecimal PlacesnumberOptional

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Radiation Absorbed Dose Converter (Gy / rad)

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Examples

1. Convert a CT scan dose from Gy to rad

2. Convert a radiotherapy fraction from cGy to Gy

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