How we estimate wedding costs

Wedding costs split cleanly into two kinds. Some scale with the number of people in the room. Some do not. The calculator models exactly that and nothing more:

total = fixed costs + (cost per guest × guest count)

Fixed costs are the ones you pay whether 40 people come or 240: the venue base fee, photography and video, entertainment, planning and coordination, and the officiant. Variable costs are the ones that move with headcount: catering and bar, rentals and place settings, favors, and per head stationery.

Splitting them this way is the whole point. Most calculators return one blended per head number, which makes a 50 guest wedding look proportionally cheap when in reality the fixed half barely moves. It is the single most common reason a small wedding costs far more per person than couples expect.

The planner splits your total across the same categories your account uses. Those amounts are not flat percentages. Each category takes a share of the fixed pot and a share of the per guest pot, and those two pots are exactly the two halves of the formula above, so the category list, the fixed against guest driven split, and the formula are all the same arithmetic.

That is why a category’s share of the budget changes with your headcount. A photographer charges a day rate, so photography is a larger slice of a 40 guest wedding than of a 240 guest one even though the dollar figure barely moves. Catering is charged per head, so it does the opposite. A flat percentage model cannot say either of those things, and gets both weddings wrong to tell one of them right.

Venue sits on both sides. The base site fee does not care how many people come, but the bar minimum, the staffing and the capacity tier all do, so a venue line is shaded partly steady and partly guest driven. A category you add yourself is shaded at your budget’s overall ratio, because we have no basis for a better guess.

These shares are our own estimates, reviewed alongside the regional figures above. Every number in the planner is editable, and the moment you type your own it wins.

We carry a per guest rate and a fixed cost figure for 51 US states and territories and 10 Canadian provinces, plus a national average for each country. They are our own estimates, compiled from published wedding cost surveys, venue and catering price sheets in each market, and what couples using iDoTogether actually enter in their budgets.

They are benchmarks, not quotes. A real venue contract in your city beats our regional average every time, which is why the calculator lets you type your own per guest number and takes it over ours the moment you do.

• US national average: $235 per guest plus $12,000 fixed
• Canadian national average: CA$280 per guest plus CA$15,000 fixed
• Least expensive US market in our data: Mississippi at $165 per guest
• Most expensive US market in our data: New York at $415 per guest

Three settings adjust both halves of the formula at once, because a venue that discounts a Tuesday in February discounts its per head catering minimum too.

Day and season stack additively before they are applied, so a weekday winter wedding lands at 70 percent of the same wedding on a summer Saturday.

Every estimate is presented as a band of plus or minus 15 percent around the midpoint. That band is not decoration. Within a single state, the gap between a barn an hour outside the city and a downtown hotel ballroom is easily wider than the gap between two different states, and no calculator that only knows your state can resolve it.

Treat the low end as what the same wedding costs with disciplined vendor choices, and the high end as what it costs once upgrades accumulate. Most couples land nearer the high end than they plan to.

The headline number covers the wedding day itself. It does not include the engagement ring, the honeymoon, rehearsal dinner or welcome party, guest travel and accommodation, or wedding party gifts. It also does not carry a line for the smaller items that routinely get missed, including alterations, vendor meals, overtime, the marriage license and postage, which together typically add 10 to 15 percent. That is what the buffer control in the planner is for: it sets a share of your total aside rather than adding a second estimate on top of the first.

Taxes and service charges are folded into the regional figures rather than broken out, because both vary by jurisdiction and by venue contract.

The regional table was last reviewed on September 3, 2026. We revisit it when market pricing moves enough to matter rather than on a fixed schedule, and this page is updated in the same edit so the date here always matches the numbers in the calculator.

If a figure looks wrong for your market, tell us and show us the quote. Write to info@idotogether.com. Corrections backed by a real vendor contract are the fastest way these numbers get better.