Usually, you would use kilometers.
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Grams is no good - it is a measure of weight not length. Kilometers measure length - but only if your table-top is a few miles long. Most appropriate would be Meters - your average dining table is about one-and-a-half meters long.
kilometers
Invalid conversion: square meters is a measure of area and meters is a measure of length or distance.
Personally nothing as I would use imperial measures, but meters are used to measure any linear length, eg the length of a table, the width of a table, the distance around a running track, etc.meters can be used to measure smaller things, eg the length of a pencil, but this would be a fraction of a meter and centimeters (hundredths of meters) would be used instead to keep the numbers simple.Similarly, longer distances, like 1500 meters or 10,000 meters (distances run in athletic competitions), could be measured, but to make the numbers simpler, kilometers (1000 meters) would be used.Once astronomical distances are reached, meters or kilometers could be used, but light years are used instead to keep the numbers simpler. A light year is the distance that light travels in 1 year which is approx 9.46 × 1015 meters (another length measured in meters!)
Length of my room Width of my road Length of a swimming pool Height of Mt Everest (not that I would measure it!) Depth of the local lake.