To find your Website's traffic, it is recommended to install Google Analytics code in your Home page of your Website.
And once you install GA code, you can check website traffic in real time as well as your website traffic history.
You can also check traffic from your Hosting Provider Cpanel, if you have enabled statistics.
Other ways to check traffic is to get Adsense approved and installed in your website, as Adsense also provide you the report of daily visitors,
it may not be that effective as Analytics by Google.
From our Free SEO Website Traffic calculator Tool you can easily find approx. monthly Visitors coming to your website.
One metrics to find any website traffic estimate is by knowing how much Alexa rank website has.
It is also useful to keep track of Competitor's Website Traffic estimates.