About this tool
The Tablecloth Size Calculator is a free, in-browser tool that finds the right tablecloth dimensions for a round, rectangular, oval, or square table. The whole calculation rests on one idea — the drop, meaning how far the cloth hangs below the tabletop on each side. Enter the table's size and height, choose a drop style or a custom drop, and the tool returns the exact cloth size, the nearest standard retail size, and a warning if the drop would puddle on the floor. Everything runs locally in your browser.
The formula is simple: cloth size = table dimension + 2 × drop, applied to each dimension (diameter for round, length and width for rectangular and oval, side for square). Drop guidance by occasion is built in: casual everyday 8 in, semi-formal 11 in, formal 15 in, and floor-length, which equals the table height so the cloth just reaches the floor. If your chosen drop exceeds the table height the cloth would pool on the ground, so the tool flags it. It then suggests a standard cloth that covers the result — round cloths of 60/70/90/108/120 in, or rectangular cloths such as 52×70, 60×84, 60×102, and 60×120 in.
As a worked example, a 60-inch round table with a 15-inch formal drop needs a cloth of 60 + 2 × 15 = 90 inches, which matches a standard 90-inch round cloth exactly. A common seating cross-check is to allow about 24 inches of table edge per place setting when deciding how many guests a table comfortably seats.