The Runway & Burn Manager

Help me understand and manage my startup's runway and burn.

Current cash: [AMOUNT]
Monthly burn: [GROSS AND NET, OR THE INPUTS TO CALCULATE]
Revenue and its trajectory: [DESCRIBE]

Provide:
1. My current runway in months, and the assumptions behind it
2. How the runway changes under slower/faster growth and hiring
3. The burn multiple / efficiency of my spend (growth per dollar burned)
4. The point at which I need to raise or cut, working back from zero
5. The levers to extend runway without killing growth

Show the maths and flag the moment I should act (raise or cut) rather than
running the tank dry — with a safety margin.