Am I doing this wrong? Need feedback on my freelance pricing method

I’m a UI designer / front-end dev with about 4 years of experience. I’ve been doing mostly small to mid-size websites (landing pages, small business sites, stuff like sports clubs, etc.). I’m trying to get better at quoting projects quickly when clients ask, without overthinking it or underpricing myself. Right now my approach is basically: I break the project into parts like design, development, content setup, and revisions. Then I estimate rough hours for each part. For a simple site it usually looks some