You get an exemption of $250,000 tax free. $500,000 if you are married and wife is on title. You will pay tax on the rest of your gain. You can deduct out improvements but have to I believe add back in depreciation taken.
If you owned it for more than a year it will be at capital gains rate, which I think is 20% fed and around 9% CA state, I think this is pretty accurate, but check with a tax preparer to be sure.
Is it only one year lived in?