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How to Use this Element Size Comparison Generator
The tool is actually quite easy to use. You just need to choose a chemical element from the dropdown list and add it to the chart for size comparison. With respect to removing any figure, you can achieve that under the ‘Remove’ tab.
Please note also you can modify the position of any figure on the chart by dragging.
It’s worth noting there is a maximum number of 5 figures that can be added to the chart. Of course, you can always remove existing figures if you reach the limit and want to add new ones.
In order to get the best visual results for comparing element sizes, try to do the following:
- When using a mobile device, make the view horizontal (i.e. landscape orientation)
- Access the tool from a computer or large tablet if at all possible
The Elements that are Available Inside the Tool
The tool will allow you to compare the size of 86 different elements from the periodic table, which is shown below.

We basically added all elements that have a calculated atomic radius. Some popular examples include Hydrogen, Oxygen, Carbon, Sodium, Nitrogen, Iron, Gold, Calcium and Iodine.
That leaves out 32 elements which all have an atomic number of 87+. Those include, but are not limited to, 9 elements with unknown properties in addition to all 15 actinides. You can see the latter group at the very bottom row of periodic table.
To simplify the matter, we assumed all elements have a spherical shape (which may not be true for all elements).

Please note the height of elements (which is used inside the tool) was found by simply multiplying the atomic radius by two.
Conclusion
Whatever chemical elements you want to compare the size between, this accurate online tool will help you out. You just need to choose and add the desired elements to the chart.
It’s worth mentioning the chart axis shows the height measurement in both metric (i.e. picometers) and imperial units (i.e. nano-inches). So, you won’t need to worry about unit conversion.
In case you’re confused or not informed about the units:
- 1 pm (picometer) = 1 x 10-12 m
- 1 n-in (nano-inch) = 1 x 10-9 in
Feel free to let us know if you find any size that’s inaccurate so we can correct it. Also, we would love to hear any suggestions or questions about the tool.