Finding an accurate hook size chart has been difficult, many are wildly inaccurate, even from reputable manufacturers – but at last I found one.
I have just uploaded a PDF document of Tiemco fly and salt water hooks. The sizes appear to be fairly accurate, but only if you print the chart at 100%. Sizes on your screen are not accurate as they are distorted by the pixel setting your screen uses.
The hook styles and shapes do not cover all hooks, but all the basics are there, so it is an excellent overall guide.
For full run-down of hook information see this.