Operating Expenses (OPEX)

Operating Expenses (OPEX) are the costs your startup incurs to run day-to-day operations. They include all expenses necessary to keep the business functioning, excluding the direct cost of producing goods or services (COGS).

🧩 What are Operating Expenses?

OPEX includes both fixed and variable costs that support your operations:

  • Salaries and benefits
  • Rent and utilities
  • Software subscriptions and tools
  • Marketing baseline spend
  • Office supplies
  • Professional services (accounting, legal, consulting)

🧠 Why OPEX Matters (Especially for Startups)

Tracking OPEX helps founders answer critical questions:

  • How much cash do we need to operate monthly?
  • Which costs can be optimized or reduced?
  • Are we burning money too fast?
  • When will we reach profitability?

Many startups fail not because revenue is low, but because OPEX grows faster than the business can sustain.

📘 How to Calculate OPEX

Step-by-step:

  1. List all operational costs: rent, salaries, marketing baseline, software, utilities, and services.
  2. Separate from COGS: exclude costs that are directly tied to producing your product/service.
  3. Sum monthly and annual expenses: This gives your total OPEX.
  4. Analyze per unit: For unit economics, divide total OPEX by number of units to understand operational cost per unit.

💡 Common Mistakes Founders Make

  • Mixing OPEX with COGS
  • Ignoring small recurring expenses
  • Failing to update OPEX after hiring or scaling
  • Underestimating variable costs

⭐ Practical Examples

Example 1: SaaS Startup
Rent = $2,000
Salaries = $15,000
Software = $1,000
Marketing baseline = $2,000
Other = $500
Total OPEX = $20,500/month

Example 2: E-commerce Store
Warehouse rent = $3,000
Salaries = $10,000
Marketing baseline = $4,000
Software and tools = $500
Other = $500
Total OPEX = $18,000/month

🎯 Startup Rule (Remember This)

Always track OPEX carefully — controlling operational costs is key to surviving and scaling your startup efficiently.