Every couple asks this question, and the honest answer is: it depends heavily on guest count and venue choice more than any other factor.
As a rough guide, venue and catering together usually account for 40-50% of a total wedding budget. Photography and videography typically run 10-15%. Decor and styling sit around 15-20%, with the remainder split across attire, entertainment, and miscellaneous logistics.
The biggest budget mistake we see is couples locking in a venue before pricing out catering per head — multiply your guest count against realistic per-plate costs before you commit to a space.
Building in a 10% contingency line is not optional. Something will come up, and it's much easier to plan for it than to find it in your final week.