To convert kilobecquerels to megabecquerels, multiply by 0.001. That factor is the whole relationship: both units measure how many nuclei decay per second, so the conversion is a proportion with no offset and no substance-specific constant.
One mega becquerel is a million of a becquerel (1e6 becquerels). One kilo becquerel is a thousand of a becquerel (1e3 becquerels).
Below the calculator there is a step table for the values people look up most, and a second table putting real how many nuclei decay per second figures into megabecquerels so the number you get has something to be compared against.
The formula
kilobecquerels- The amount you are converting, in kilobecquerels
0.001- The exact number of megabecquerels in one kilobecquerel
megabecquerels- The converted result
How it works, step by step
- Enter the value in kilobecquerels.
- It is multiplied by 0.001, the exact factor between the two units.
- The answer is shown in megabecquerels, with the reverse conversion beneath it.
- Check the reference table if you want a figure of comparable size.
Worked examples
Banana, from potassium-40: 0.015 kBq in megabecquerels
Banana, from potassium-40 comes to about 0.015 kBq. Multiplying by the factor: 0.015 × 0.001 = 1.5e-05 MBq. Dividing the answer back by 0.001 returns the figure you started with, which is the quickest way to check you have the factor the right way up.
Thyroid scan dose: 1.85e+05 kBq in megabecquerels
Take thyroid scan dose, roughly 1.85e+05 kBq. The conversion is a single multiplication — 1.85e+05 × 0.001 — giving 185 MBq. Because the relationship is proportional, doubling the input doubles the answer to 370 MBq.
How to read your score
Frequently asked questions
How many megabecquerels are in one kilobecquerel?
Exactly 0.001. Every figure on this page is that one number multiplied by your input, so the only rounding is at the display step.
What is the formula to convert kilobecquerels to megabecquerels?
megabecquerels = kilobecquerels × 0.001. Reversed, kilobecquerels = megabecquerels ÷ 0.001, which is the same as multiplying by 1000.
Which is the bigger unit, the kilobecquerel or the megabecquerel?
The megabecquerel. One kilobecquerel is only 0.001 of a megabecquerel, so it takes 1000 kilobecquerels to make one megabecquerel.
What does this quantity actually measure?
Both units measure how many nuclei decay per second. That is why a single factor is enough: there is no temperature offset and no material property involved, unlike conversions that cross between different quantities.
What is a kilobecquerel?
One kilo becquerel is a thousand of a becquerel (1e3 becquerels).
What is a megabecquerel?
One mega becquerel is a million of a becquerel (1e6 becquerels).
Why does my answer differ from another converter?
Almost always because the other tool rounded the factor before multiplying. This page keeps full double precision through the calculation and rounds only for display, and it prints the factor it used so you can see where any difference came from.
Kilobecquerels to megabecquerels reference tables
| Kilobecquerels | Megabecquerels |
|---|---|
| 0.5 kBq | 0.0005 MBq |
| 1 kBq | 0.001 MBq |
| 2 kBq | 0.002 MBq |
| 3 kBq | 0.003 MBq |
| 5 kBq | 0.005 MBq |
| 10 kBq | 0.01 MBq |
| 20 kBq | 0.02 MBq |
| 25 kBq | 0.025 MBq |
| 50 kBq | 0.05 MBq |
| 75 kBq | 0.075 MBq |
| 100 kBq | 0.1 MBq |
| 250 kBq | 0.25 MBq |
| 500 kBq | 0.5 MBq |
| 1000 kBq | 1 MBq |
| 5000 kBq | 5 MBq |
Exact factor: 1 kilobecquerel = 0.001 megabecquerels.
| Quantity | kBq | MBq |
|---|---|---|
| Banana, from potassium-40 | 0.015 kBq | 1.5e-05 MBq |
| Domestic smoke detector source | 37 kBq | 0.037 MBq |
| Thyroid scan dose | 1.85e+05 kBq | 185 MBq |
| Cancer therapy source | 3.7e+08 kBq | 3.7e+05 MBq |
| One gram of radium-226 | 3.7e+07 kBq | 3.7e+04 MBq |
| EPA radon action level, per m3 | 0.148 kBq | 0.000148 MBq |
Published reference values, converted with the same factor this page uses.