Monthly Burn Rate Explained

Monthly burn refers to the amount of cash a startup spends each month to operate its business. It’s one of the most closely watched metrics in early-stage companies because it determines runway, fundraising timelines, and risk exposure. Investors frequently ask about burn during due diligence because it reveals how efficiently a company uses capital. For founders, understanding monthly burn isn’t just about accounting, it’s about survival and strategic timing.

What Is Monthly Burn?

Monthly burn is the amount of money a company spends each month beyond what it earns in revenue.

Simplified:
It’s how much cash your startup is losing every month.

There are two common types:

• Gross Burn
  Total monthly operating expenses.
  
  

• Net Burn
  Gross burn minus monthly revenue.
  
  

Net burn is typically the more important figure when calculating runway.

Why It Matters for Founders

Strategic impact

• Determines how long the company can operate.
  
  

• Influences fundraising timing.
  
  

• Shapes growth vs. cost-control decisions.
  
  

Financial impact

• Directly affects runway calculations.
  
  

• Signals operational efficiency.
  
  

• Impacts valuation discussions with investors.
  
  

Marketing impact

• Investors assess burn relative to growth metrics.
  
  

• High burn with low traction may reduce investor confidence.
  
  

• Efficient burn can strengthen fundraising narrative.
  
  

Hiring and growth impact

• Hiring increases burn significantly.
  
  

• Scaling marketing campaigns increases monthly outflow.
  
  

• Cost discipline affects team expansion speed.
  
  

How It Works

1) Calculate Monthly Expenses

Include:

• Salaries and contractor payments
  
  

• Office or infrastructure costs
  
  

• Software tools
  
  

• Marketing spend
  
  

• Legal and professional services
  
  

2) Determine Monthly Revenue

Include:

• Recurring revenue
  
  

• Predictable contracts
  
  

• Exclude speculative pipeline revenue
  
  

3) Calculate Gross Burn

Total monthly expenses.

4) Calculate Net Burn

Net Burn = Monthly Expenses − Monthly Revenue

5) Monitor Trend

Track:

• Burn growth rate
  
  

• Burn relative to revenue growth
  
  

• Burn relative to cash reserves
  
  

Real-World Example

A startup has:

• $200,000 monthly expenses
  
  

• $80,000 monthly recurring revenue
  
  

Gross burn: $200,000
Net burn: $120,000

If the company has $1,200,000 in cash:
Runway = $1,200,000 ÷ $120,000 = 10 months

If the company hires aggressively and increases expenses to $250,000:
Net burn increases to $170,000
Runway drops significantly.

This shows how hiring decisions directly affect survival timelines.

Common Mistakes

• Confusing gross burn with net burn
  Revenue offsets expenses and changes runway.
  
  

• Ignoring burn growth rate
  Increasing burn month over month shortens runway faster than expected.
  
  

• Delaying fundraising until runway is too short
  Fundraising often takes 4–6 months or longer.
  
  

• Assuming revenue growth will automatically offset burn
  Revenue may lag behind spending.
  
  

Treating burn as static
Burn fluctuates with hiring, expansion, or market conditions.