They are very small softgels. They may be a tad larger than a vitamin D3 softgel, but definitely smaller than regular size softgel.
November 16 2017
If the brand you are asking about is Healthy Origins, the 500 mg caps are half the size (length) of the 1000 mg caps.
I do not have my bottle handy to make an accurate measurement of the length, but they are about as long as they are wide. We get the 500 mg size because they are easy to swallow than the 1000mg size and we take two to get a dose of 1000 mg.
Hope this helps. .
November 15 2017
they are about 15mm long and 10mm wide at widest point. They are shaped just like a rugby ball and all my children swallow them easily (the youngest is 5). Hope this helps