How to promote a project for the public?

Hi,

I created a site containing 150 useful converters and calculators for the use of the public.
I don't want to earn money from this site (it contains no ads at all),
I only want to give back to the community with something people often need.

Here is the link to my project:
www.ConvertForFree.com

How can I promote such site?

Thanks

 

Free promotion methods:
facebook account/community (sent a link to friends)
free web catalogues
twitter account
linkedIn account
link exchange
offline promotions

 

Thanks! Any more tips?

 

Email outreach - a program like Ninja Outreach could save you some time.

 

Thanks I will try it.

 

You can use social media sites to get attention of public in no time.

 

Yes, I already use Facebook and Twitter.
Any others social media sites I can use?

 

you can also use reddiet media

 

Thanks, I will definitely try it.