Short answer
For 100 guests, plan for 10 to 14 tables. Most round tables seat 8 to 10 people, so 10 tables of 10 or 13 tables of 8 work well. Check your venue's table sizes and room shape before finalising.
For a 100 person wedding, the number of tables depends on the table size and layout. Round tables typically seat 8 to 10 guests, so you would need between 10 and 13 tables. If you use rectangular tables, you might seat 8 to 12 per table, so 9 to 13 tables could work.
Think about the room shape and how much space you need for dancing, a bar, and a cake table. Leave enough room for guests to move between tables and for waiting staff to serve comfortably. A good rule is to allow at least 1 metre between tables, but check with your venue for their specific guidance.
Also consider the mix of guests. You may want to seat couples together and keep friendship groups close. Use a seating plan app or a large printed chart to help you organise. Always confirm the exact table dimensions with your venue before you decide on the final number.
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