Burn Rate

Why Burn Rate Matters

Burn rate is the single number that tells you how much time you have left. Every founder, whether bootstrapped or venture-backed, needs to know this figure cold. It drives hiring decisions, fundraising timelines, and whether you can afford that next marketing hire or ad spend push.

Investors ask about burn rate in almost every pitch meeting because it signals discipline. A founder who can't answer "what's your monthly burn" instantly raises a red flag about financial control.

Gross Burn vs Net Burn

There are two versions of burn rate, and mixing them up leads to bad decisions.

Gross Burn

Gross burn is total monthly operating expenses, full stop. It ignores any revenue coming in.

Gross Burn = Total Monthly Cash Expenses

Net Burn

Net burn subtracts revenue from expenses. This is the number that actually determines runway.

Net Burn = Total Monthly Cash Expenses - Monthly Revenue

Example:

A startup spends $80,000 a month on salaries, tools, and office costs. It brings in $25,000 in monthly recurring revenue.

• Gross Burn = $80,000
• Net Burn = $80,000 - $25,000 = $55,000

If that company has $660,000 in the bank, its runway is:

Runway = Cash in Bank / Net Burn
660,000 / 55,000 = 12 months

That 12-month number is what matters for planning a fundraise, not the gross figure.

How to Calculate It Yourself

1. Pull your bank balance from the start and end of the month.
2. Add back any new funding that came in during that period (it inflates the ending balance but isn't burn).
3. Subtract the adjusted ending balance from the starting balance.
4. That difference is your net burn for the month.

Most founders track this in a simple spreadsheet or lightweight finance tool, updated monthly. Average it over the last 3 months to smooth out one-off expenses like annual software renewals or a big contractor invoice.

Benchmarks: What's a Healthy Burn Rate

There's no single right answer since burn depends on stage, team size, and business model. But rough guardrails:

• Pre-seed / idea stage: Burn should be minimal, often under $15k to $30k/month, mostly founder salaries and basic tools.
• Seed stage (small team): $40k to $100k/month is common for a 3 to 8 person team.
• Series A and beyond: Burn scales with headcount and go-to-market spend, often $150k to $500k+/month, but should be justified by growth metrics (revenue growth rate, CAC payback).

A common rule of thumb from investors: your burn multiple (net burn divided by net new revenue added that month) should ideally stay under 2x. A burn multiple of 1x or lower signals efficient growth; above 3x tends to worry later-stage investors.

Common Mistakes

Confusing gross and net burn. Reporting gross burn to investors when you have real revenue understates your efficiency. Reporting net burn when you have almost no revenue can hide how fast you're actually spending.

Not accounting for lumpy expenses. A single large payment (annual insurance, a conference sponsorship) can spike one month's burn and scare you into a wrong decision. Always look at a 3-month rolling average.

Ignoring burn rate until it's urgent. Founders who only check their bank balance when it feels low often end up fundraising from a position of weakness. Track burn monthly, even when things feel fine.

Forgetting taxes and one-time costs. Payroll taxes, annual software license renewals, and equipment purchases all count as cash out the door, even if they don't feel like "burn."

Burn Rate and Fundraising Strategy

Most investors expect a startup to raise enough to cover 18 to 24 months of runway at the current burn rate, with a plan to hit specific milestones (revenue targets, user growth, product launch) before the next round. If your calculated runway is under 6 months, that's typically considered a fundraising emergency, and terms tend to get worse the closer you are to running out of cash.

Tools like welaunch.sh can help founders plan launch timing and growth milestones so that burn rate decisions (when to hire, when to spend on marketing) are tied to actual traction rather than guesswork.

Quick Reference

Knowing these four numbers cold, and updating them monthly, is one of the simplest habits that separates founders who raise on their own terms from those who don't.