How to Build a Runway Calculator

function calculateRunway(cashBalance, monthlyBurn) {
  if (monthlyBurn <= 0) return Infinity; // Profitable or break-even
  return Math.floor(cashBalance / monthlyBurn);
}

function calculateBurnRate(expenses, revenue) {
  return expenses - revenue; // Net burn
}

function calculateRunwayWithGrowth(cash, burn, monthlyGrowthRate) {
  let months = 0;
  let currentBurn = burn;
  let remainingCash = cash;

  while (remainingCash > 0 && months < 120) {
    remainingCash -= currentBurn;
    currentBurn *= (1 - monthlyGrowthRate); // Burn decreases as revenue grows
    months++;
  }
  return months;
}