---
title: Burn Rate — definition | RGM® Glossary
url: https://realgrowthmatters.com/glossary/burn-rate/
updated: 2026-06-10
source_html: https://realgrowthmatters.com/glossary/burn-rate/
---

# Burn Rate

burn rate/bəɹn ɹeɪt/noun

Every startup is a fire consuming cash — this is the reading on the fuel gauge.

Term
:   Burn Rate

Forms
:   Gross burn / net burn

Unit
:   Currency / month

Companion
:   Runway = cash ÷ net burn

## Forms & parts of speech

burn · noun (clipped form)

Monthly net cash consumption.

"Our **burn** is $400k against fourteen months of runway — the rebrand can wait."

## Definition in plain terms

Burn rate is how fast a company consumes cash, stated monthly. GROSS burn is total monthly cash spending; NET burn is spending minus cash revenue — the number that matters, because it's what actually drains the account. A company holding $4.2M with a net burn of $300k/month has fourteen months of runway: the burn rate's whole purpose is that division.

## The mechanics

Burn is a cash-flow concept, not an accounting one — count cash out the door, not accrued expenses, and watch the items P&Ls smooth over (annual contracts paid up front, payroll timing). Net burn falls two ways: cut spending or grow revenue, and the second compounds while the first usually can't repeat. For marketers, burn context sets the rules of engagement — at high burn, experiments need short payback windows; CAC payback time stops being a finance nicety and becomes survival math.

## When it matters

Burn matters always but rules during fundraising gaps and downturns — the 'default alive or default dead' question is burn versus growth trajectory. Marketing sits in burn's blast radius: brand spend with 18-month payoffs is rational at 30 months of runway and reckless at 8. The healthiest discipline is pricing every marketing program in runway-months — it converts budget debates into the one currency founders actually spend.

**Worked example.** A Series A startup with 11 months of runway debates a $600k brand campaign with an estimated 14-month payback. Priced in burn terms, the campaign costs two runway-months for a payoff arriving after the company would be dead without a raise. The marketing lead reframes the plan: performance spend with sub-4-month payback now, the brand program staged to begin the week a term sheet clears. Same total budget across two years — sequenced by the fuel gauge instead of the calendar.

**Failure modes to watch.** Confusing gross with net burn in runway math; treating burn as fixed while revenue is the lever; running long-payback marketing at short runway; and discovering the real burn from the bank balance instead of the model.

## Synonyms & antonyms

### Synonyms

burn ratecash burnmonthly burn

### Antonyms

cash-flow positiveprofitability

## Origin & history

\*Reconstructed from language history and industry usage; no single verifiable origin source exists. 'Burn rate' originates in aerospace engineering — the consumption rate of rocket propellant — and crossed into venture finance as a metaphor for cash consumption, entering common startup vocabulary by the late 1980s and becoming ubiquitous (with books titled for it) in the dot-com era.

Etymology: [source](https://en.wikipedia.org/wiki/Burn_rate).

## Usage trends

Search interest for this term over the last five years:

[View interest-over-time on Google Trends →](https://trends.google.com/trends/explore?q=burn%20rate&date=today%205-y)

## Common questions

What is burn rate?
:   The speed of monthly cash consumption — gross (all spending) or net (spending minus cash revenue).

How is runway calculated?
:   Cash on hand divided by net monthly burn — the months until the account hits zero at current trajectory.

What does burn rate mean for marketing?
:   It sets payback discipline — the shorter the runway, the shorter the acceptable CAC payback on any spend.

## Related tools & calculators

- tool[CAC calculator](/tools/cac-calculator/)
- tool[LTV-to-CAC ratio](/tools/ltv-to-cac-ratio-calculator/)

## Resources & people to follow

- book*The Lean Startup* — Ries (runway as pivots remaining)
- referencePaul Graham — "Default Alive or Default Dead?"
- referenceDavid Skok / forEntrepreneurs — burn and SaaS cash-flow troughs

Curated, non-competitor resources verified per term.

## Related training

- module[Marketing analytics](/training/marketing-analytics/)

## Disciplines

Areas of marketing where burn rate is a core concern:

[Measurement](/training/marketing-analytics/)[Growth strategy](/training/growth-marketing-foundations/)

## Read next

## Related terms

[CAC payback period](/glossary/cac-payback-period/)[MRR](/glossary/mrr/)[ARR](/glossary/arr/)[LTV](/glossary/ltv/)[David Skok](/glossary/david-skok/)

## Sources

1. trends[Google Trends — "burn rate"](https://trends.google.com/trends/explore?q=burn%20rate&date=today%205-y)