Absorbed dose is the amount of energy deposited by ionizing radiation per unit mass of matter. It is measured in Gray (Gy) in the SI system, where 1 Gy equals 1 joule per kilogram (1 J/kg). The older unit is the rad, where 1 Gy = 100 rad. Absorbed dose is a fundamental quantity in radiation therapy, diagnostic imaging, nuclear medicine, and radiation protection.
Absorbed Dose Converter
Convert between Gray (Gy), rad, joule/kilogram (J/kg), milligray, microgray, kilogray and 20+ other radiation dose units with ICRU-standard precision.
Conversion Formula
1 Gray (Gy) = 100 rad
Common Absorbed Dose Conversions
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How to Use This Absorbed Dose Converter
Our absorbed dose converter is engineered for medical physics, radiation therapy, and nuclear science applications. Follow these steps for accurate conversions.
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Select Source Unit Choose the unit you want to convert from (Gray, rad, J/kg, etc.)
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Select Target Unit Choose the unit you want to convert to from the second dropdown
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Enter Dose Value Type the absorbed dose value — the result appears instantly
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View Formula The exact conversion formula is displayed for verification
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Swap Units Click the swap button to instantly reverse the conversion
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Reference Table Use the common conversions table for quick lookups
Why Professionals Choose This Converter
Built with precision engineering for medical physics and radiation dosimetry, our converter meets the demands of scientists, engineers, and healthcare professionals.
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ICRU-Standard Precision Results accurate to 10 significant digits using ICRU and ICRP conversion factors.
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25+ Units Supported From attogray to petagray, including SI, CGS, and derived units.
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Instant Results Real-time conversion as you type — no buttons to click, no waiting.
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Works Offline All calculations run locally in your browser. Perfect for laboratories.
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Universal Compatibility From basic keypad phones to 4K displays — works on every device.
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Zero Tracking No cookies, no analytics, no data collection. Your privacy is absolute.
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Free Forever No subscriptions, no hidden fees, no usage limits, no advertisements.
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Medical Grade Suitable for radiation therapy, diagnostic imaging, and nuclear medicine.
What is Absorbed Dose?
Absorbed dose is a fundamental quantity in radiation physics that measures the amount of energy deposited by ionizing radiation per unit mass of matter. It is a critical parameter in radiation therapy, diagnostic imaging, nuclear medicine, and radiation protection.
The SI unit of absorbed dose is the Gray (Gy), defined as one joule of energy absorbed per kilogram of matter (1 Gy = 1 J/kg). The older CGS unit is the rad (radiation absorbed dose), where 1 Gy = 100 rad.
Absorbed dose is used in:
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Radiation Therapy Tumor treatment planning typically uses doses of 20-80 Gy
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Diagnostic Imaging CT scans deliver 10-50 mGy, X-rays deliver 0.01-1 mGy
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Nuclear Medicine Radioactive tracer doses measured in mGy to Gy
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Radiation Protection Occupational limits typically 20-50 mSv/year (related to dose)
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Food Irradiation Food preservation uses 1-10 kGy doses
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Industrial Applications Material testing and sterilization use kGy to MGy doses
Frequently Asked Questions
Gray (Gy) is the SI unit of absorbed dose, while rad is the older CGS unit. The conversion is: 1 Gray = 100 rad, or equivalently, 1 rad = 0.01 Gray. Gray is the internationally accepted standard used in medical physics and radiation therapy, while rad is still used in some older literature and in the United States.
Absorbed dose measures the energy deposited per unit mass (measured in Gray). Equivalent dose accounts for the biological effectiveness of different radiation types by multiplying absorbed dose by a radiation weighting factor (measured in Sievert, Sv). For example, alpha particles have a weighting factor of 20, meaning 1 Gy of alpha radiation = 20 Sv equivalent dose.
We support 25+ absorbed dose units including:
- SI Units: Gray (Gy), milligray (mGy), microgray (μGy), nanogray (nGy), kilogray (kGy), megagray (MGy), gigagray (GGy), teragray (TGy), petagray (PGy)
- CGS Units: rad, millirad (mrad), microrad (μrad), kilorad (krad)
- Energy/Mass: joule/kilogram (J/kg), joule/gram (J/g), joule/milligram (J/mg), erg/gram, erg/milligram
- SI Prefixes: hectogray (hGy), decagray (daGy), decigray (dGy), centigray (cGy), picogray (pGy), femtogray (fGy), attogray (aGy)
Our converter uses scientifically-verified conversion factors from the International Commission on Radiation Units and Measurements (ICRU) and International Commission on Radiological Protection (ICRP) standards. Results are accurate to 10 significant digits, suitable for medical, scientific, and professional applications. The conversion between Gray and rad is exact: 1 Gy = 100 rad.
Yes, the ASLI FORM Absorbed Dose Converter is 100% free forever. There are no registration requirements, no usage limits, no subscription fees, and no hidden charges. We do not display advertisements and we do not collect any personal data. Our mission is to provide a premium tool that medical physicists, radiologists, and researchers can use without barriers.
Yes. Once the page loads, all calculations happen locally in your browser. There is no server-side processing, no API calls, and no internet dependency for conversions. This makes the tool perfect for laboratories, hospitals, field work, and remote locations where connectivity may be limited.
1 Gray (Gy) is exactly equal to 1 joule per kilogram (1 J/kg). They are the same unit expressed differently. Gray is the named SI unit, while J/kg is the derived unit expression. This converter treats them as equivalent, so converting between Gy and J/kg will always give a 1:1 ratio.
Absolutely. Our converter is designed with a mobile-first responsive approach and works perfectly on every device — from basic keypad phones to 4K desktop displays. The interface adapts intelligently to your screen size. Touch interactions, scroll snapping, and momentum scrolling are all optimized for mobile devices.
Typical absorbed dose values vary widely:
- Chest X-ray: 0.02-0.1 mGy
- CT scan (head): 20-50 mGy
- CT scan (abdomen): 10-30 mGy
- Radiation therapy (fraction): 1.8-2 Gy
- Radiation therapy (total): 20-80 Gy
- Food irradiation: 1-10 kGy
- Industrial sterilization: 25-50 kGy
- Material testing: 100 kGy to 1 MGy
Several key features set us apart:
- Premium design with fluid animations and professional typography
- Real-time conversion — no submit button needed
- Formula explanations for educational value
- Common conversions table for quick reference
- 25+ units including all SI prefixes from atto to peta
- Offline capability for laboratory work
- Zero tracking — complete privacy
- Universal compatibility across all devices
- ICRU-standard precision for medical applications
No. We do not collect, store, or transmit any of the values you enter. All calculations happen entirely in your browser's memory and are destroyed the moment you close the tab. We use no analytics scripts, no cookies for tracking, and no third-party services that could see your conversions. Your privacy is absolute and non-negotiable.
The conversion is straightforward:
- Gray to rad: Multiply by 100. Example: 2 Gy × 100 = 200 rad
- rad to Gray: Divide by 100. Example: 500 rad ÷ 100 = 5 Gy
Absorbed dose (Gray) measures energy deposited per unit mass. Effective dose (Sievert) accounts for both the radiation type and the sensitivity of different organs. Effective dose = absorbed dose × radiation weighting factor × tissue weighting factor. For example, 1 Gy to the lung has a different effective dose than 1 Gy to the skin because lungs are more radiosensitive.
We welcome feedback from our users. You can reach our support team through multiple channels:
- Phone: +91-7011993433 (Mon-Sat, 9 AM to 7 PM IST)
- WhatsApp: Same number with pre-filled message
- Email: support@asliform.in
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