Quick answer
Cash Runway & Burn Rate Calculator quick answer
Formula: Net burn = monthly expenses − monthly revenue. Runway months = cash balance ÷ positive net burn.
Example: $50,000 cash with $10,000 monthly revenue and $15,000 monthly expenses creates $5,000 monthly net burn and about 10 months of simple runway.
Reviewed September 1, 2026 · Methodology
Worked example
$50,000 cash with $10,000 monthly revenue and $15,000 monthly expenses creates $5,000 monthly net burn and about 10 months of simple runway.
What to do with the result
Runway can change quickly when revenue or expenses change. This is a constant-month scenario, not a cash-flow forecast.
Public API & AI agent access
Yes — this calculator is callable programmatically. Use GET /api/v1/cash-runway, the public calculator API, or tannerd.net's MCP, A2A and WebMCP agent interfaces. Results include a human-facing citation URL.
Frequently asked questions
What is net burn?
The amount by which monthly expenses exceed monthly revenue in the entered scenario.
What if revenue is higher than expenses?
There is no positive burn in the simple model, so finite runway is not calculated.
Formula provenance
API identifier: cash-runway · Formula version: tncalc.cash-runway.1.0.0 · Engine release: 6.6.1. Build provenance · Public validation · Release history.