Event Budget Planner

An event budget planner that lets you cost out an entire event line by line, group spending by category, track each vendor and whether they have been paid, and watch a live breakdown of where your money is going. It is built for anyone organising a wedding, milestone birthday, corporate party, conference or fundraiser who wants one clear place to see the full picture instead of scattered quotes and spreadsheet tabs.

How it works

You start by setting the event basics: a name, a date, your currency, the total budget you are working to, and the guest count. Then you add line items — one row per cost. Each row carries a name, a category (venue, catering, drinks, decor, entertainment, photography, attire, stationery, transport, favours or other), the vendor supplying it, an estimated price and an actual price once it is confirmed, plus a Paid checkbox.

The planner keeps a running set of totals. Allocated spend uses the actual figure for any line where you have entered one and the estimate everywhere else, so the remaining budget is always honest. A coloured progress bar shows how much of your cap is committed and turns amber as you near the limit and red if you go over. Separate tiles surface what is paid versus still outstanding, and a cost-per-guest figure that updates as your guest list changes. A doughnut chart breaks the total down by category (or by individual item) so the biggest line items are obvious at a glance.

Everything is calculated in your browser and saved to local storage, so your plan survives a refresh. When you want a record or need to share it, export the whole plan to CSV (opens in any spreadsheet) or JSON (re-importable here later). Nothing is uploaded to a server at any point.

Example

Imagine an £15,000 wedding for 80 guests. You add the reception hall at £4,500 (paid), a three-course dinner estimated at £3,600 that comes back as £3,840, welcome drinks at £1,200, florals at £1,250 (paid), a live band at £1,800 and a full-day photographer at £1,500 (paid).

The planner shows roughly £14,090 allocated, leaving about £910 remaining, with £7,250 already paid and £6,840 still outstanding. Cost per guest works out to around £176. The doughnut chart makes it instantly clear that venue and catering together eat well over half the budget — exactly the lines to challenge if you need to claw money back.

Every figure recalculates the moment you change a price, tick a vendor as paid, or adjust the guest count — and none of it ever leaves your device.