Runway Forecast for Growth Marketers: Ben's 12% Fix

Who This Helps

You're a growth marketer who needs to move channel metrics without guesswork. You've got the data, but stakeholders want a clear story before they say yes. The Founder Finance Basics Mission Pack is built for this moment—especially the Runway Forecast mission.

Mini Case

Meet Ben. He runs growth at a SaaS startup. Revenue is up 20% month over month, but cash is flat. His CEO asks, "Can we keep spending?" Ben runs the Runway Forecast mission from the Founder Finance Basics Mission Pack. He finds that one channel has a CAC payback of 14 months—way over the 7-month target. That channel eats 12% of the budget. Ben presents a simple fix: reallocate that 12% to a channel with a 5-month payback. The CEO approves in one meeting.

Do This Now (5 Steps)

1. Pull your last 3 months of spend and revenue by channel. Keep it simple—a spreadsheet works.
2. Calculate CAC payback for each channel. Divide total channel cost by gross margin per customer, then divide by monthly revenue per customer.
3. Flag any channel with payback over 7 months. That's your risk zone.
4. Run a runway forecast. Use your current cash balance and monthly burn to see how many months you have left if you keep spending.
5. Present one recommendation. Show the 12% reallocation move. Say, "Move this spend here, and we extend runway by 3 months."

Avoid These Traps

• Don't mix gross and net revenue. Use gross margin consistently.
• Don't ignore one-time costs like setup fees. They skew payback.
• Don't present all channels at once. Lead with the biggest risk.
• Don't forget to update the forecast after you make the change.
• Don't assume your CEO knows unit economics. Explain it in one sentence.
• Don't use vague terms like "efficiency." Use numbers like 12% and 7 months.
• Don't skip the stress test. What if revenue drops 20%? Run that scenario.
• Don't wait for perfect data. Use what you have and iterate.

Your Win by Friday

By Friday, you'll have one clear recommendation your stakeholders can approve. You'll know exactly which channel to cut and where to reinvest. No more guesswork. Just a calm, data-backed move that extends runway and keeps growth on track. Plus, you'll look like the person who turns analysis into action—without the stress.