The following tools are compliments of Randy Adamson!  Thanks Randy!

Cubic Inch Displacement & Compression Ratio
Sample: V8 Engine with 4.030 bore,  3.500 stroke,  .036 head gasket thickness, 4.075 head gasket diameter, .015 deck clearance, .360 ring land height, flat top piston w/2cc valve relief, and 70 cc head  volume should give you a CID of 357.15 with a static compression ratio of 9.82:1.
NOTE: For this calculator to work - you must have Java Script enabled, Netscape 4 and IE 4 or greater should be fine!
  Edit data, press button Erase and start from scratch
Bore Size, inches Piston Size, inches Stroke, inches Cylinder Head  Volume, cc's Piston Dome/Dish Volume, cc's
" " " cc's cc's
Head Gasket Bore Size, inches Head Gasket Thickness, inches Piston Ring Land Height, inches Deck Height, inches
" " " "
Engine Size Liters: Cylinder Volume: Gasket Volume: Deck Volume: Total Volume:
cl's cc's cc's cc's cc's
Compression Ratio: Engine Size in Cubic Inches
:1
If you have any comments contact Russ

Note: Feel free to save this to your local drive, copy paste what ever works for you and have your way with it. It is very portable and self contained (no server script, just plain old java).

CLICK HERE FOR A GEAR RATIO CALCULATOR