Do not bother with size : Export as SVG file format.
It will fits all enlarging sizes since it is vectorial…
Your actual size is :
But the problem is less the size than the position…
Here is your actual logo :
Why so much white space below? You should restrain to the letters…
Also with SVG you would not have this blurry effect due to JPEG bad algo for flat colors.
So open Illustrator, retype, restrain working space to the exact logo size and export as SVG
And it will be OK
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In addition to previous response, I'd also recommend checking out this help article to know about exporting as SVG.
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