Startup Runway Calculation Guide
Work through cash, revenue, expenses, net burn, and cash-out timing before relying on a runway number.
Conceptual worksheet
Startup runway review
Illustrative monthly inputs- Starting cash
- $500,000
- Payroll
- $40,000
- Tools
- $5,000
- Rent / overhead
- $8,000
- Other
- $3,000
- Total monthly outflows
- $56,000
- Realized cash inflows
- $25,000
- Monthly net burn
- $31,000
Headline estimate
16.1 months
Starting cash divided by positive monthly net burn. Timing, obligations and changing assumptions still need review.
Assumption check
Expected revenue stays outside the received-cash input until it is realized.
- 1Starting cash
- 2Monthly outflows
- 3Realized inflow basis
- 4Net burn
- 5Headline runway
- 6Review assumptions
This on-page guide explains the inputs behind a basic runway estimate. It does not provide a downloadable spreadsheet. Use it to organize held cash, realized monthly cash inflows, and monthly expenses before testing the numbers in the interactive runway calculator.
A basic estimate divides cash by monthly net burn. That result is a starting point, not RunwayCal's product-derived True Cash Position or a guarantee of what the business can safely spend. Recorded obligations, timing, and the quality of the inputs still matter.
The structure below helps you prepare the figures, calculate a simple trajectory, and note which assumptions need further review.
What this guide covers
- Held-cash input
- Monthly expense categories such as payroll, tools, rent, and other operating costs
- Monthly realized cash-inflow input
- Net burn estimate: expenses minus realized cash inflows
- Basic runway estimate: cash divided by net burn
- Estimated cash-out month
- A 12-month cash trajectory to review
- Separate notes for hypothetical expense or revenue changes
How to work through it
Confirm the starting cash figure
Use the held-cash amount relevant to the decision. Do not add unused credit or expected revenue to cash already held.
List monthly expenses
Record payroll, tools, rent, and other operating costs without hiding one-time or irregular obligations.
Separate received revenue
Use money received for the simple estimate. Keep pipeline and expected receipts separate from realized cash.
Calculate net burn and runway
Subtract received monthly revenue from monthly expenses, then divide the starting cash figure by positive net burn.
Review the assumptions
Treat the result as an estimate. Check obligations, timing, and hypothetical changes before using it in a decision.
What this guide does not provide
- No spreadsheet or downloadable file is delivered on this page
- The simple estimate does not reproduce RunwayCal's product-derived True Cash Position
- The guide does not update when the underlying figures change
- The result is planning context, not financial advice or a spending guarantee
Carry the estimate into a connected runway view
RunwayCal keeps confirmed inputs, recorded obligations, current runway context, and saved hypothetical scenarios in their proper roles. Changes to reviewed inputs recompute the relevant view without turning a scenario into actual financial reality.
- Current runway and cash-out context
- Recorded obligations kept visible alongside held cash
- Saved scenarios remain separate from canonical reality
- Read-only reporting paths for reviewed financial context