Volume calculation with varying thickness

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I have rectangular slabs which I printed, the thickness varies from 9.8mm to 10.08 on one side and width varies from 10-10.6 mm , the height is 20mm. How can I calculate the actual volume? Is there any mathematical procedure to introduce these varying thickness and get a good estimate of the volume? What is the best method to average this varying thicknesses? How can I measure the actual volume experimentally, if its not too difficult? Need precise volume measurements. Thanks for the help in advance.

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One approach is to measure the dimensions on opposite sides of the block and average them. This will be correct if the dimensions vary linearly. If the piece is thick in the middle and thin on the edges, not so much.

Another approach is to weigh the blocks. You can do that very accurately with a good scale. If the density is known you have to volume. You could make some blocks that you machine to good parallelepipeds so you can measure them well, weigh them, and use that density. If you do a few you can justify how repeatable the density is.

Another approach is water (or other liquid) displacement. Start with a known volume of water, submerge the object, and measure the total volume. Volumes are harder to measure accurately, so this may not be so good for you.