Startup Burn Rate: The Complete Survival Guide

Your startup's burn rate determines how long you have to survive. Miscalculate it, and you could run out of money before you're ready. Here's everything you need to know.

What is Burn Rate?

Burn rate is how much money your startup spends each month. It's typically measured in two ways:

Gross Burn

Total monthly spending (before revenue)

Net Burn

Monthly spending minus monthly revenue

Example:

Monthly expenses: $25,000
Monthly revenue: $5,000
Net burn: $20,000/month

Why Burn Rate Matters

Runway Calculation

If you have $200,000 in the bank and burn $20,000/month:

$200,000 / $20,000 = 10 months of runway

Investor Concerns

Can you reach milestones before money runs out?
What's your path to profitability?
Will you need to raise again?

Decision Making

When to hire
When to cut costs
When to raise money

How to Calculate Burn Rate

Step 1: Gather Financials

Bank statements (3-6 months)
Credit card statements
Payroll records
Vendor invoices

Step 2: Categorize Expenses

Fixed costs (rent, salaries, software)
Variable costs (marketing, contractors)
One-time costs (equipment)

Step 3: Calculate Monthly Average

Use 3-6 months for accuracy:

(April + May + June) / 3 = Average Monthly Burn

Key Metrics to Track

Monthly Recurring Revenue (MRR)

Your predictable monthly income

Customer Acquisition Cost (CAC)

What you spend to acquire each customer

Lifetime Value (LTV)

What each customer is worth over time

LTV:CAC Ratio

Good: 3:1 or higher
Target: 4:1 or higher

Gross Margin

Revenue minus cost of goods sold

Planning Your Runway

The 18-Month Rule

Investors typically want 18+ months of runway after their investment.

Milestone Planning

Map out key milestones:

Product launch
First revenue
Product-market fit
Scale marketing

Contingency Planning

Always have a backup:

Can you cut costs 30%?
Can you extend runway?
What's your minimum viable team?

Using the Burn Rate Calculator

Our Burn Rate Calculator helps you:

Enter monthly expenses
Add your current cash
See runway projections
Model different scenarios

Try different scenarios to plan for the future.

Reducing Burn Rate

Cut Non-Essential Costs

Subscriptions you don't use
Expensive office space
Unnecessary tools

Optimize Hiring

Hire slowly, fire quickly
Consider contractors first
Hire for what you need now

Increase Revenue

Focus on high-margin offerings
Improve conversion rates
Raise prices strategically

Extend Runway

Negotiate better terms
Pay annually (get discounts)
Refinance debt

Red Flags

Warning Signs

Burn increasing faster than revenue
Customer acquisition costs too high
Low gross margins
No path to profitability

investor red Flags

Less than 12 months runway
Unsustainable unit economics
No clear path to profitability

Key Takeaways

Track burn rate monthly
Plan for 18+ months runway
Reduce burn before you need to
Know your path to profitability

With the right calculations and planning, you can build a sustainable startup that survives and thrives.