Begin with a purpose and a list of assumptions. Keep an estimate separate from money actually received or spent.
A worked planning example
Imagine 100 attendees paying $6 each. Gross receipts would be $600. Fixed costs are $150, and materials cost $1.50 per attendee. At 100 attendees, total costs are $300 and the amount left is $300.
| Attendees | Receipts | Total costs | Amount left |
|---|---|---|---|
| 40 | $240 | $210 | $30 |
| 60 | $360 | $240 | $120 |
| 100 | $600 | $300 | $300 |
Each extra attendee contributes $4.50 after the modeled materials cost. Covering $150 in fixed costs therefore takes at least 34 attendees under these assumptions. Real budgets may include additional costs, refunds, or fees.
Make your own worksheet
Record each item, estimated amount, actual amount, owner, and receipt reference. Compare a lower-attendance case before committing to purchases. Follow the school’s existing approval and money-handling process.