This calculator converts radiation absorbed dose values from one unit to another, like gray (Gy) to rad, mGy to Gy, or rad to mrad. It helps students, lab workers, health physics teams, and anyone reading radiation reports or technical documents. You enter a number, choose the starting unit, and pick the unit you want. The tool then returns the converted absorbed dose instantly. It's useful when different countries, industries, or instruments use different dose units and you want a clear, consistent value for comparison or documentation.

How to Use This Calculator

• Enter the absorbed dose value (the number you have).
• Select the "from" unit (example: Gy, mGy, rad, mrad).
• Select the "to" unit you want to convert into.
• Check the result shown by the calculator.
• If needed, switch units again to compare multiple formats.

What This Calculator Measures

This calculator measures absorbed dose, which is the amount of radiation energy deposited in a material.

• Absorbed dose: Energy from radiation absorbed per kilogram of material.
• Gray (Gy): The SI unit of absorbed dose. 1 Gy = 1 joule per kilogram (1 J/kg).
• Rad: An older absorbed dose unit found in some reports. 100 rad = 1 Gy.
• mGy / µGy: Smaller metric units used for low doses (mGy is one-thousandth of a Gy, µGy is one-millionth).

Absorbed dose is not the same as equivalent dose or effective dose (often written in sievert, Sv). Those include biological weighting.

Formula or Logic (Easy Explanation)

The converter uses fixed unit relationships. Here's the simple logic: first, it converts your input into a common base unit (often Gy). Then it converts that base value into your selected output unit. Because unit definitions are fixed, the conversion stays consistent. Helpful reference points: 1 Gy = 100 rad and 1 rad = 0.01 Gy.

Example Calculations

Example 1: Convert 250 mGy to Gy

• Input: 250 mGy
• Output: 0.25 Gy

Example 2: Convert 3.5 Gy to rad

• Input: 3.5 Gy
• Output: 350 rad

Example 3: Convert 120 rad to Gy

• Input: 120 rad
• Output: 1.2 Gy

Understanding Your Results

Your result shows the same absorbed dose, just written in a different unit. What the numbers usually indicate: Gy expresses absorbed energy per kilogram; rad expresses the same absorbed energy, but the number is 100 times larger than Gy for the same dose; smaller units like mGy and mrad make low readings easier to read without many decimals. If you are comparing documents, confirm you are looking at absorbed dose (Gy/rad) and not equivalent/effective dose (Sv/rem).

Common Mistakes to Avoid

• Confusing absorbed dose (Gy, rad) with equivalent dose (Sv, rem).
• Assuming rad and rem are the same unit.
• Entering a value in mGy but selecting Gy as the input unit.
• Missing unit prefixes like m (milli) or µ (micro).
• Rounding too early and losing accuracy for small values.
• Copying a number from a report without checking the dose type.
• Comparing Gy/rad values to Sv/rem values directly.