I placed 5 8-inch plastic flower pots on top of my table and put a piece of plywood on top of the flowerpots. You don't have to lift the table and the plywood is light and easy to handle. I store the plywood on the tabletop covered with a tablecloth when not in use. Buy the height of pot you need. Use 5 instead of 4 to keep the plywood from sagging.
Raising a Craft Table
If you must use your dining room table as a cutting table when you are sewing, you probably get a back ache from leaning over the table. My mother did a lot of sewing, and she found a solution for this problem.
Go to your pantry and gather up 4 cans of vegetables of the same size. Set one under each table leg. This raises the table to a more comfortable level.
By Harlean from Arkansas
Building a Raised Craft Table
Get two kitchen cabinets from Lowes, Home Depot, or used. You will want the tall ones that create a table that is a height that is easy on your back. Then put an old flat door on top of them. You can leave it set up or you can take the door off and take it out only when you need to use it.