Most blown event budgets are not blown by the big line you negotiated hard. They are blown by the small lines nobody costed: the extra staff hours, the rental return fee, the upgraded internet the venue charges for. A real breakdown lists everything, even the things you hope are free.
The categories every event budget has
Costs vary wildly by event, so chase your own quotes rather than someone's percentages. But the categories are remarkably consistent.
- Venue: room hire, plus the extras (cleaning, security, overtime, power)
- Catering: per-head food and drink, service staff, and the minimum spend
- Production and AV: sound, screens, lighting, recording, technicians
- Speakers and talent: fees, travel, accommodation, hospitality
- Marketing: registration platform, design, signage, paid promotion
- Staffing: your own team's time, plus temporary day-of crew
- Materials: badges, print, swag, branded environment
The costs first-timers miss
Service charges and tax on catering, which can add a fifth to the bill. Venue power and internet as paid add-ons. Load-in and load-out labor. Shipping and storage. Card or platform processing fees on ticket revenue. Gratuities. None are large alone, together they are the gap between your estimate and the invoice.
Track estimated against actual
A budget is not a one-time spreadsheet, it is a living comparison. Put estimated and actual side by side on every line and mark what is paid, so you always know if you are under or over before the invoices land, not after. The event budget calculator does exactly this, and Event70 keeps the budget on the event next to your vendors. Start free to set yours up.