I suspect your asking because your not making the money you thought you would? There are other post in this forum about how to bid jobs, so my answer will be what are you probably doing wrong. I had the problem of not making enough money.
The first thing I look at is what would it cost me to hire a well paid painter to do this job, plus material (if you buy) Then pay overhead and some advertising for the next job. Are you charging enough to do this. Do you have a daily minimum. Are you covering time to set up and clean up after.
The worst thing that I used to do is "bid'm to get'm. If you've developed a reputation of quality work your should be able charge enough to cover your business expenses. I will tell you my experience when I quit second guessing my price, the yes time from customers took longer, I had a few that I thought I wasn't going to get this year, but 3 out of 5 called back and I got 5 referrals from two of them. BTW, I'm currently working on the third one, and hope to get some referrals there too.
Two more thoughts. I know painters who lost jobs bidding too low. People with nice homes care more about the work being done professionally then some hack trying to get beer money. Also, if you can't make a decent living you might as well go work for someone else and not have the hassle of running a business