Determine your kitchen table's current height. Use a tape measure to measure the distance from the floor to the top of the table. Determine how high you would like the table to be. Sit down in a chair beside the table and hold your arms in a comfortable manner in front of you as you would if you were resting them on the table. Have someone measure the approximate distance from your arms to the table top. If the underneath portion of the table is hitting your legs, have someone measure what would be a better table height. Determine the approximate distance from your leg to the position in which you are holding the table.
Consider purchasing a piece of plexiglass that matches the shape of your kitchen table. Cover the table with a tablecloth and no one will know it's there. This works to raise the table, not the legs. If you are handy with a table or circular saw, cut your own 1-inch thick plexiglass for the top of the table. Cutting plexiglass is challenging work that risks chipping the glass and injuring you. Be sure to wear safety equipment including goggles. Measure the table first to determine how much plexiglass will be needed. Use a table saw with a carbide blade to cut according to your measurements. Sand the edges of the plexiglass with a sander and set it on top of your table. Use a thicker piece of plexiglass if necessary.
Purchase risers. Generally risers are used for beds, but they also can be used for sofas, chairs, and tables. Risers are made of a hard rubber that can hold the weight of any table. Purchase risers that are two inches, three inches, or five inches high. Risers can be purchased from any department store or home improvement store. They generally come in a pack of four and cost about $25.