Radioactivity Converter

Convert decay activity units independently of absorbed dose.

Choices on this device

Remember only the selected units in this browser. Numbers and other inputs are not saved. Used for fresh standalone examples; shared links and workspace cards keep their own choices.

Your numbers

Converted value

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Activity is decays per second, not dose or health risk. No conversion to gray or sievert is performed.

Formula

y = x × a ÷ b

x is the input, y is the converted value, a is the source-unit factor and b is the target-unit factor. Use the factors in the table below.

Unit conversion factors

Base unit: Bq

Unit	Base units per listed unit
Bq	1
kBq	1,000
MBq	1,000,000
GBq	1,000,000,000
Ci	37,000,000,000
mCi	37,000,000
µCi	37,000

Convert decay activity units independently of absorbed dose.

Worked example

Value to convert: 1
From unit: mCi
To unit: MBq

Converted value: 37 MBq
Value in base unit: 37,000,000 Bq

Scope and limitations

Activity is decays per second, not dose or health risk. No conversion to gray or sievert is performed.

Inputs are checked for missing values and allowed ranges. A result outside the finite numeric range is not displayed. Rounding affects display, while the calculation uses the model’s numeric precision.

Check your units and assumptions before relying on a result. Changing a label does not convert a currency or physical unit.

Formula version: 66f2a7bef664 · Example checked: 2026-10-30

Methodology