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There are many compression ratio calculation tools around the internet and in textbooks, but we've not seen one with all the features of ours:

Works in inches or mm.

Calculates cubic capacity of the engine.

Cylinder head gasket volume can be input directly, or calculated for you.

'Dead area' around the top of the piston can be considered if required.

Printing facility for your engine records.

This software is provided for FREE, and can be downloaded from the link below