Imagine you’re fifteen to eighteen. You’ve got 30 classmates, a business class on a Friday, and zero in the bank. The challenge is simple: turn that class and some free time into a profitable event in three months’ time. The profit to be made is more achievable than you may think.
This is the calculator we walk every Blastbeat team through in their first week. Real proportions, real ranges, real outcomes from past cohorts — written in generic units so the lesson is the same whether you’re in Cape Town, Cork or Cologne.
Step 1: The starting position — zero capital
Every Blastbeat team starts with nothing from school, parent or personal savings. The first cash that lands in the team’s account is the first money the team has earned — by selling tickets for the event and getting local business sponsors.
That isn’t something that makes things hard for the learners. It’s actually the essence of showing that you can start a business with no capital — but with a good events business plan and a team. The team works together to book a venue and acts, sell tickets, find sponsors — so you don’t need any capital. That sequence — income before expenditure — is the most important business lesson learnt by doing.
Step 2: Fixed and variable costs
The costs of a school-night event break into roughly the same buckets every time. We’ll use generic units below — one ticket = 100 units — so the maths scales to any market and currency.
Total cost of running the event: ~25,000 units. That’s the number the team has to beat.
Step 3: Revenue lines
Three streams of revenue are available to a Blastbeat team. Most teams use all three.
Ticket revenue
A 350-person school event with tickets at 100 units each generates 35,000 units at full capacity, or 28,000 units at 80% capacity. Most teams aim for 80% as a planning baseline. (Translate 100 units into whatever your local market bears — in 2026 SA cohort that was R85–R120; in Ireland it was about €6–€9. Same lesson, same maths.)
Sponsorship
Local sponsors — small businesses, parents’ companies, local stores — typically contribute 2,000–10,000 units each in cash or in-kind value. Most teams secure 2–5 sponsors. Median sponsorship pulled in 2024 was about 14,500 units per team.
Concessions
Soft drinks, snacks and light hospitality at the event. Margin is tight but adds 3,000–6,000 units to a strong event.
Step 4: The 75/25 split
Once costs are paid, the profit splits. 75% goes to the team — to share, save, or reinvest. 25% goes to a climate project the team designs themselves.
- 75% — the team
- Splits among the 14 students, or saves to fund their next event.
- 25% — climate project
- Ring-fenced. Team designs and reports on the project.
Step 5: A worked example
Let’s walk through a realistic worked example. Same proportions as a real 2024 cohort, expressed in units (one ticket = 100 units):
- Tickets sold: 300 at 100 units = 30,000 units
- Local sponsorship (3 sponsors): 14,000 units
- Concessions: 4,000 units
- Total revenue: 48,000 units
- Cost of running event: 25,000 units
- Net profit: 23,000 units
- To team (75%): 17,250 units
- To climate project (25%): 5,750 units
The team can choose to split part of the team share among themselves and reinvest the rest in their finale-event preparation. The 5,750-unit climate share funds a student-designed project — in the SA cohort that was a coastal clean-up on Strandfontein beach. Any local tax treatment on student earnings follows the local rules of the territory you’re in.
Build your own — the live calculator
Move the three sliders to model your own event. Numbers update live and follow your chosen currency (top-right nav). Use this in your team’s first planning week.
Costs assumed at R23,400 (median 2024 SA cohort). Concessions at R4,300 (median). Adjust as needed for your venue.
Cost & concession assumptions use the 2024 cohort median. If your team is below zero net profit you’ll see a negative figure — that’s the conversation to have with the team in week 5, not week 12.
Step 6: The 25% climate cut, in 23 years of numbers
Across 23 years, with about 360,000 students and a varying mean profit per team, the cumulative 25% climate cut from the global Blastbeat alumni network has funded over 1,800 student-led climate projects — from sea-grass restoration in the Cape to bee corridors in central Europe to a small reforestation plot in Kenya.
What students learn from the maths
The honest answer is that they don’t learn the maths. The maths isn’t hard. They learn three things the maths only reveals:
Cash flow vs profit. A team that sells R44K in tickets but spent R23K to get there has profited R21K. Until they internalise that distinction, they’ll feel they’re “winning” long before they actually are.
Risk vs return. Spending R7,500 on a venue you can’t fill is a problem. Spending R3,000 on marketing that fills the venue is the answer. Risk is what you allocate before you know.
Discipline. The 25% climate ring-fence is non-negotiable. Teams cannot dip into it. Learning to leave money alone is, frankly, more important than learning to earn it.
“The first time I saw the bank balance after we’d paid all the bills, I cried. We had real money in the account. We’d started the year with nothing.”
— CFO, 2024 cohort, Mitchells PlainThe student profit-calculator workbook.
Editable spreadsheet with sample budgets, cost lookups, and a profit-projection model. Used by every Blastbeat team in their first three weeks.
Bring this maths into your school.
Apply for the 2026 cohort and watch your students do this with real money.
Sources
- Blastbeat 2024 ZA cohort financial returns, n=22 events.
- SARS, tax treatment of student earnings.