What this calculator does
See how your wedding budget splits across each part of the day, and what it means per guest. A budget is easiest to stick to when every part of the day has a number before you pay the first deposit. Without one, the early choices, usually the venue and the photographer, quietly eat into money meant for everything else. Then the small items at the end add up faster than you expect.
The calculator divides your total budget into eight categories, using shares you can adjust. It rounds each to the cent, so the pieces add back up exactly. It shows the cost per guest overall, and for the venue, food and drink. That's the part that grows with every name on the list. Enter what you've already spent or booked, and it shows how much is left. The starting shares are a neutral template, not a rule. Feel free to move money toward what matters most to you.
Where it's used
Why this math matters outside the classroom:
- Wedding planning. A couple with $30,000 and 100 guests sees a budget of $300 per guest and $13,500 for the venue and catering.
- Comparing quotes. Planners divide a caterer's $9,600 quote for 80 guests by 80 to get $120 per head and compare it with their target.
- Classroom percent problems. Students find 45%, 12% and 8% of a $20,000 budget, which are $9,000, $2,400 and $1,600.
- Family contributions. Relatives who agree to fund the photography see exactly what 12% of the budget comes to.
- Other big events. Organizers of milestone birthdays and reunions use the same split to plan a fixed budget across categories.
Grade level and standards: Grade 6; Common Core State Standards for Mathematics 6.RP.A.3.c, 6.RP.A.3.b. © Copyright 2010. National Governors Association Center for Best Practices and Council of Chief State School Officers. All rights reserved.
How to use it
- Enter your total budget and the number of guests you expect.
- Adjust the share for each category to match your priorities. They should add up to 100%. If they don't, the calculator scales them to fit and tells you.
- If you like, enter the amount already spent or booked.
- Read the cost per guest and the amount for each category in the table. Then come back to the shares as quotes come in.
What the inputs mean
- Total wedding budget
- The full amount you have for the wedding from all sources, including help from family. Decide whether the rings and the honeymoon are inside this number or separate.
- Number of guests
- Your best guess at the final head count. Guest numbers drive catering, rentals, invitations and favors. So this is often the biggest lever on the total.
- Venue, food and drink share
- Ceremony and reception venues, catering, drinks, cake, service charges and tips for staff. This is usually the largest category.
- Buffer for surprises share
- Money held back for overruns, last-minute extras, delivery fees and taxes that weren't in the first quotes. Many planners keep a cushion so a surprise doesn't push the total over.
- Spent or booked so far (optional)
- Deposits you've paid, plus what you still owe on contracts you've signed. That money is committed, even if it hasn't left your account yet.
Formula and method
cost per guest = total budget ÷ number of guests category budget = total budget × category share if the shares add up to S% instead of 100%: share used = share × 100 ÷ S left to spend = total budget − spent or booked
Each category gets its share of the total. S is what your shares add up to. When they don't total 100%, each one is scaled by the same amount. That way the whole budget still gets used, and the categories keep the same balance with one another.
Amounts are rounded to the cent with the largest-remainder method. First, every category gets its share rounded down. Then any leftover cents go to the categories that lost the most in rounding. So the table always adds up to exactly the budget you entered.
Worked example
A couple has a $30,000 budget and expects 100 guests. They keep the starting shares and have already booked $12,000 of services.
- Cost per guest: $30,000 ÷ 100 = $300.00.
- Venue, food and drink: $30,000 × 45% = $13,500.00, which is $135.00 per guest.
- Photography and video: $30,000 × 12% = $3,600.00. Attire, hair and makeup: $30,000 × 8% = $2,400.00.
- Music, and flowers and decor, also get 8% each ($2,400.00). Stationery and favors get $1,200.00, other costs $1,500.00, and the buffer $3,000.00.
- Left to spend: $30,000 − $12,000 = $18,000.00, with 40% of the budget committed.
Result: The budget works out to $300 per guest. That includes $13,500 for the venue, food and drink, with $18,000 still to allocate after the bookings.
Understanding the result
Cost per guest is the quickest way to tell whether a plan is realistic. Compare the per-guest figure for venue, food and drink with real quotes from caterers or venues near you. If quotes are well above it, the guest list, the share or the total needs to change.
So many costs grow with the head count. That's why trimming the guest list often frees more money than cutting a single category. Try a lower guest number and watch the per-guest figures rise.
Leave the buffer alone until late in planning. If it's still there in the final weeks, it can go toward an upgrade, or just stay in your pocket.
Assumptions and limitations
- The default shares are a simple starting template chosen for this calculator. They aren't averages from any survey.
- Every category is a fixed share of the total. Nothing is tied to the guest count except the per-guest figures.
- Amounts are rounded to the cent so the categories add up exactly to the budget.
- Prices vary hugely by region, season, day of the week and style. So check every category against local quotes.
- Taxes, service charges and tips aren't added separately. Include them in the category shares or the buffer.
- Spending is tracked as one total, not per category.
Frequently asked questions
Which category should get the biggest share?
For most weddings, it's the venue, food and drink, because every guest needs them. Beyond that, it depends on what you value. Couples who care most about photos often raise that share, while others put more into music or attire. Pick your top two priorities first, and fund them before the rest.
How can we lower the cost per guest?
The biggest levers are the guest count, the day and season, the meal style and the drinks plan. Off-peak dates, daytime receptions and simpler service usually cost less per head than prime Saturday evenings with full bars.
Should rings and the honeymoon be in the wedding budget?
Either way works, as long as you're consistent. Many couples budget them separately, because they're personal purchases, not costs of the event. If you include them, put them in the other category or increase its share.
What happens if our shares add up to more than 100%?
The calculator scales every share down by the same amount, so the total stays within budget. It also shows what your shares added up to. To control exactly where the cuts fall, adjust the shares yourself until they total 100%.
How this calculator is checked
Method: Percentage allocation of a fixed budget with proportional rescaling of shares that don't sum to 100%; cent rounding by the largest-remainder method (src/lib/finance/allocate.ts). The calculation is covered by automated tests with known reference values and edge cases. Last updated 2026-10-18. Found a problem? Tell us.
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