Hi Cynthia,

A text-to-HTML ratio of between 15 and 70 percent is generally considered ideal.

Try this tool, http://tools.seochat.com/tools/code-to-text-ratio/

It is a pretty good tool, but like Andy stated, the best bet is to focus on improving the content on your site, followed by running these pages through https://validator.w3.org/ and follow whatever recommendations possible to reduce code bloat etc...

Cheers,

Kevin