---
title: "Burn Rate, Runway, Default Alive: How Startups Should Track Cash"
description: "Burn rate and runway are the two most important numbers in any startup. Here's how to calculate them cleanly — and why 'default alive' matters in 2026."
date: 2026-04-18T00:00:00.000Z
tags: ["vc-explainers", "startup-metrics", "investor-education"]
source: https://venturecapitaltracker.com/burn-rate-runway-default-alive-dead
---

# Burn Rate, Runway, Default Alive: How Startups Should Track Cash

> Burn rate and runway are the two most important numbers in any startup. Here's how to calculate them cleanly — and why 'default alive' matters in 2026.

**Burn rate** and **runway** are the two most important numbers in any startup — and the two most often misreported. Clean tracking of both is non-negotiable for serious operating discipline and fundraising.

### Burn rate

**Gross burn rate**: Total monthly cash outflow (salaries, rent, software, ads, cloud, legal, etc.).

**Net burn rate**: Gross burn minus monthly revenue.

**Example**:
- Monthly costs: $500K.
- Monthly revenue: $150K.
- **Gross burn**: $500K/month.
- **Net burn**: $350K/month.

### Runway

**Runway (in months)** = Current cash balance / Net monthly burn.

**Example**:
- Cash: $6M.
- Net burn: $350K/month.
- **Runway**: ~17 months.

### Default alive vs default dead

Paul Graham's framework (2015 essay):

- **Default alive**: With current growth trajectory and no new funding, the startup reaches profitability before running out of cash.
- **Default dead**: Without new funding, the startup runs out of cash before reaching profitability.

### How to compute default alive

1. **Project revenue growth**: Use realistic, not aspirational, growth rates.
2. **Project cost growth**: Usually lower than revenue growth (unit economics).
3. **Extend forward** until revenue covers costs.
4. **Compare to current runway**: If profitability arrives before cash runs out, you're default alive.

### 2026 context

- **Default alive is back in fashion**: Post-2022, LPs and VCs reward disciplined capital efficiency.
- **24-month runway** is now the default fundraise target (up from 18 months in 2020–2021).
- **AI infrastructure burn**: Companies with material compute spend need to model it separately.

### How to extend runway

1. **Reduce burn**:
   - Headcount: the largest lever in most companies.
   - Cloud/compute: increasingly material for AI-heavy startups.
   - Marketing: cut lowest-ROI spend first.
2. **Increase revenue**:
   - Existing customers: expansion, upsell, price increases.
   - New customers: accelerate sales cycle; tighten close rates.
3. **Raise capital**:
   - Bridge or priced round.
   - Venture debt.
   - Revenue-based financing for capital-efficient companies.

### Common reporting mistakes

1. **Using gross burn when investors ask for net** (or vice versa).
2. **Ignoring seasonality**: Q4 revenue bursts can mask Q1 weakness.
3. **Excluding one-time costs**: Tax payments, legal fees must be modeled.
4. **Ignoring receivables timing**: Billed revenue is not cash.

### Practical takeaway

1. **Founders**: Track net burn and runway weekly; share monthly with board.
2. **Investors**: Push portfolio companies toward default alive; extend runway before financial pressure.
3. **Operators**: Build a 3-scenario forecast (pessimistic, base, optimistic) and refresh monthly.

### Further reading

- Paul Graham's "Default Alive or Default Dead?": http://paulgraham.com/aord.html

**By:** [Venture Capital Tracker](https://venturecapitaltracker.com/editorial-policy)

**Editorial note:** AI tools assisted with research, structure, or drafting. Venture Capital Tracker retains human editorial responsibility for factual accuracy, relevance, and source quality before publication.