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• Debt Snowball vs Avalanche in Excel: The Rollover Formula Most Calculators Skip
  How to build a debt payoff spreadsheet that actually rolls a paid-off debt's payment into the next one, with the ranking, cascade, and summary formulas, and a worked example showing why the no-rollover shortcut is off by years.
• How to Build a DCF Model in Excel: A Step-by-Step Guide
  Build a DCF model in Excel from the 10-K up: a 5-year FCF projection, WACC with CAPM, two terminal value methods, mid-year discounting, and a bridge to price.
• Mortgage Extra Payment Formula in Excel: How Much Interest You Save and When You Finish
  The exact Excel formulas for a mortgage amortization schedule with extra payments, how to compute interest saved and months saved against a no-extras baseline, and the three mistakes that make most homemade payoff calculators overstate the savings.
• Post-Money SAFE Conversion in Excel: The Formula That Gets the Share Count Right
  How a post-money SAFE turns into shares at a priced round, why the shortcut most cap table spreadsheets use shorts the SAFE holder, and the Excel formulas that solve it in closed form with no circular reference, with a worked seed round.
• Rental Property Cash Flow Formula and Cash-on-Cash Return
  Calculate rental property cash flow from gross rent to NOI, debt service, and cash-on-cash return, with a worked duplex example and a 10-year IRR view.
• Startup Financial Model Template: What Investors Expect
  A startup financial model template walkthrough covering driver-based forecasting, the 8 things investors check, and a worked runway and raise-sizing example.
• Startup Runway Calculator: Burn Rate Formula and a Worked Example
  How to calculate startup runway from cash, gross burn, and net burn, why the one-line formula overstates it, and how to build a month-by-month runway table that tells you the real zero-cash date.