How to Stop Guessing: Your Playbook for Unit Economics

You're running a business, and things are moving. You're getting customers, making sales, and busy with the day-to-day. But sometimes, it feels like you're just moving fast without really knowing if you're making money on each sale, or if all that effort is truly paying off. You might see cash come in, but then it quickly goes out, and you're left wondering where it all went.

This feeling of uncertainty is common, especially when you're growing. You might be tempted to just focus on getting more customers, but if each new customer costs you more than they bring in, you're actually digging a deeper hole. Before you scale up, you need to be sure that your core business model is healthy.

That's where understanding your unit economics comes in. It helps you break down your business into its smallest profitable parts. By looking at the numbers for just one customer or one product, you can see if your business is sustainable and if your growth efforts will actually lead to profit, not just more busywork.

Skip the spreadsheet: the free Unit Economics Calculator works out every number in this playbook from one month of your figures, including Paystack fees, refunds and failed deliveries.

The Idea: Understanding Profit at Its Smallest Scale

Unit economics is simply about figuring out the profit or loss your business makes from a single "unit" of sales. Most often, this unit is one customer, but it could also be one product, one shipment, or one booking. The goal is to understand if the money you make from that single unit is more than the money it costs you to acquire and serve it.

If your unit economics are strong, it means that for every customer you get, you're likely to make a profit. If they're weak, every new customer might actually be costing you money. Knowing this helps you make smart decisions about pricing, marketing spend, and how you operate. It’s like checking the foundation of a building before you add more floors.

We’ll focus on four key numbers: Contribution Margin (CM), Customer Acquisition Cost (CAC), Customer Lifetime Value (LTV), and Payback Period. Let's break them down.

Your Step-by-Step Guide to Calculating Unit Economics

To truly understand your unit economics, you need to track these numbers consistently. Don't worry if your initial calculations aren't perfect; the important thing is to start.

Step 1: Define Your Unit and Calculate its Contribution Margin (CM)

First, decide what your "unit" is. For most businesses, it's a customer. But if you sell distinct products with very different costs, you might calculate CM per product. For simplicity, let's assume your unit is a customer and we'll look at the average transaction.

The Contribution Margin is the revenue you get from a unit minus all the variable costs associated with that unit.

Variable costs are expenses that change directly with the number of units you sell or customers you serve. Examples include the cost of goods sold (raw materials, manufacturing), payment processing fees (e.g., charges from Paystack, Flutterwave), shipping or delivery costs for that specific item, sales commissions, and packaging materials per order.

Fixed costs are costs that don't change much, regardless of how many units you sell. Examples include rent, salaries for administrative staff, website hosting fees, and office electricity. Fixed costs are important for overall profitability but are not included in unit economics directly.

How to calculate CM:

1. Average Revenue Per Order (ARPO): Take your total sales revenue over a period (e.g., one month) and divide it by the total number of orders or transactions in that period.
   • Example: Last month, you made ₦500,000 from 100 orders. ARPO = ₦500,000 / 100 = ₦5,000.
2. Average Variable Costs Per Order (AVCPO): Sum all your variable costs for that same period and divide by the number of orders.
   • Example: For those 100 orders, your variable costs were:
     • Product cost: ₦200,000
     • Payment processing fees: ₦10,000
     • Delivery costs: ₦50,000
     • Total Variable Costs = ₦260,000.
     • AVCPO = ₦260,000 / 100 = ₦2,600.
3. Contribution Margin Per Order: ARPO - AVCPO
   • Example: CM Per Order = ₦5,000 - ₦2,600 = ₦2,400.

This ₦2,400 is the money from each order that goes towards covering your fixed costs and ultimately making a profit. If your CM is negative, you're losing money on every sale, which is a big problem.

Step 2: Calculate Your Customer Acquisition Cost (CAC)

CAC is how much it costs you, on average, to get one new customer. This is crucial for understanding if your marketing and sales efforts are sustainable.

How to calculate CAC:

1. Total Acquisition Spend: Sum up all the money you spent on marketing, advertising, sales salaries, tools, and any other costs directly related to acquiring new customers over a specific period (e.g., a month or quarter).
   • Important: Only include costs directly linked to new customer acquisition. If your sales team also handles existing customer support, try to estimate the percentage of their time spent on new acquisition.
   • Example: Last month, you spent:
     • Facebook Ads: ₦80,000
     • Influencer marketing: ₦40,000
     • Salesperson's salary (50% focused on new leads): ₦30,000
     • Marketing software subscription: ₦10,000
     • Total Acquisition Spend = ₦80,000 + ₦40,000 + ₦30,000 + ₦10,000 = ₦160,000.
2. Number of New Customers Acquired: Count how many new customers you gained in that same period.
   • Example: You acquired 50 new customers last month.
3. CAC: Total Acquisition Spend / Number of New Customers Acquired
   • Example: CAC = ₦160,000 / 50 = ₦3,200.

So, it cost you ₦3,200 to get each new customer.

Step 3: Estimate Your Customer Lifetime Value (LTV)

LTV is the total profit you expect to earn from a customer over the entire period they buy from you. This is where you see the long-term value of your customer relationships.

LTV can be tricky to calculate accurately, especially for new businesses without much historical data. Start with a simple estimate and refine it over time.

How to estimate LTV (simplified method):

1. Average Purchase Frequency (APF): How many times, on average, does a customer buy from you in a given period (e.g., a year)?
   • Example: You track that customers buy, on average, 4 times a year.
2. Average Customer Lifespan (ACL): How long, on average, does a customer remain active with your business? This could be 1 year, 2 years, etc. If you don't have enough data, make a reasonable assumption (e.g., 2 years for a clothing brand, 6 months for a single-use service).
   • Example: You estimate customers stay with you for 2 years.
3. Average Contribution Margin Per Order (from Step 1): We calculated this as ₦2,400.
4. LTV: Average Contribution Margin Per Order * Average Purchase Frequency * Average Customer Lifespan
   • Example: LTV = ₦2,400 * 4 (purchases/year) * 2 (years) = ₦19,200.

This means you expect to make ₦19,200 in profit from each customer over their entire relationship with your business.

Tools like the back-office system I built for NextGen Kiddies, with its order history and customer tracking, help founders see these repeat purchases and estimate customer lifespan more accurately. If you're building a commerce platform, making sure you can easily pull this kind of customer data is key.

Step 4: Calculate Your Payback Period

The payback period tells you how long it takes for a new customer to generate enough profit (through their purchases) to cover the cost of acquiring them. A shorter payback period is generally better, as it means you recover your marketing investment faster.

How to calculate Payback Period:

1. CAC (from Step 2): ₦3,200
2. Average Contribution Margin Per Customer Per Month: If a customer buys 4 times a year, that's roughly 0.33 times a month. So, 0.33 * ₦2,400 = ₦792 (per month).
3. Payback Period (in months): CAC / Average Contribution Margin Per Customer Per Month
   • Example: Payback Period = ₦3,200 / ₦792 ≈ 4 months.

It takes you about 4 months to earn back the money you spent to get a new customer.

Putting It All Together: The LTV:CAC Ratio

The LTV:CAC ratio is one of the most important unit economics metrics. It directly compares how much profit you expect to get from a customer versus how much it cost to acquire them.

• LTV:CAC Ratio: LTV / CAC
  • Example: LTV:CAC = ₦19,200 / ₦3,200 = 6.

A general rule of thumb (though this varies by industry) is to aim for an LTV:CAC ratio of at least 3:1. An LTV:CAC of 6:1, like in our example, suggests a very healthy business model where you are generating a lot of value from your customers relative to your acquisition costs. If your LTV:CAC is less than 1, you're losing money on every customer and need to urgently reduce CAC or increase LTV. If it's between 1 and 3, you're likely breaking even or making a small profit, indicating room for improvement. If it's above 3, this is generally a healthy sign, meaning you have room to invest more in growth.

Common Mistakes Founders Make (and How to Avoid Them)

I've seen many founders make these errors when trying to understand their numbers:

1. Confusing Fixed and Variable Costs: This is the most common mistake. Founders often include salaries, rent, or website hosting in their "cost per unit." This inflates the unit cost and makes it seem like they're losing money on every sale, or worse, they price too high. To avoid this, be strict. If a cost doesn't directly increase or decrease with each additional unit sold, it's a fixed cost. Remember, unit economics focuses on the direct profit per unit, not overall business profit. Your Contribution Margin contributes to covering fixed costs.

2. Not Including All Acquisition Costs in CAC: Founders often forget to include their own time, the cost of marketing tools, or even discounts given to new customers as part of CAC. To avoid this, create a specific budget line for "Customer Acquisition" and track every expense that goes into getting new customers. Be honest about your own time if you're doing marketing yourself; assign an hourly rate.

3. Overestimating LTV: It's easy to assume customers will buy more often or stay longer than they actually do, especially in early stages. This leads to an inflated LTV and potentially overspending on marketing. To avoid this, be conservative with your LTV estimates initially. Base it on actual historical data if you have it. If not, use realistic assumptions and explicitly state them. As you gather more data, refine your LTV calculation regularly.

4. Treating All Customers the Same: Not all customers are equally profitable. Some buy once and disappear, others become loyal advocates. If you average everything, you might miss important segments. To avoid this, as your business grows, try to segment your customers. Calculate CM, CAC, and LTV for different customer groups (e.g., those acquired through social media vs. referrals, or high-value vs. low-value customers). For example, on a platform like OPNMRT, if you see certain products or sellers consistently attract higher-value customers, you can lean into those insights to target your efforts more effectively.

5. Not Recalculating Regularly: Your costs, prices, and customer behavior change. What was true six months ago might not be true today, especially with currency fluctuations or changing supplier prices in Nigeria. To avoid this, make unit economics a regular review. Monthly or quarterly is a good cadence. This isn't a one-time exercise; it's an ongoing health check for your business.

Your Unit Economics Checklist

Ready to dig into your numbers? Use this checklist:

• Define your "unit": Is it a customer, a product, or a booking?
• Identify all variable costs for your unit (e.g., COGS, payment fees, delivery).
• Calculate your Average Revenue Per Order (ARPO).
• Calculate your Average Variable Costs Per Order (AVCPO).
• Calculate your Contribution Margin Per Order (ARPO - AVCPO). Is it positive?
• List all expenses directly related to new customer acquisition (marketing, sales salaries, tools).
• Count your new customers for the same period.
• Calculate your Customer Acquisition Cost (CAC).
• Estimate your Average Purchase Frequency.
• Estimate your Average Customer Lifespan.
• Calculate your Customer Lifetime Value (LTV).
• Calculate your Payback Period.
• Calculate your LTV:CAC Ratio. How does it compare to 3:1?
• Review these numbers monthly or quarterly.
• Consider segmenting your customers if your business has diverse offerings or acquisition channels.

What I'd Do This Week

If you're just starting with unit economics, here are three concrete actions I'd recommend you take this week:

1. Pin Down Your Variable Costs: Pick your highest-selling product or service. Go through every single cost associated with delivering just one of those. This includes the product itself, packaging, payment processing fees, and any direct delivery costs. Get this number as accurate as possible.
2. Track Your Marketing Spend and New Customers Accurately: For the next seven days, meticulously record every penny you spend on marketing, no matter how small. At the same time, count every new customer who comes in directly from those efforts. Even a week of accurate data will be better than guessing.
3. Run Your Numbers: Put last month's figures into the free Unit Economics Calculator, save the result, and do it again next month to see the trend. If you prefer a spreadsheet, create one with columns for "Date," "Revenue," "Variable Costs," "Contribution Margin," "Marketing Spend," and "New Customers." Start filling it in daily or weekly. This consistent tracking is the bedrock for all future calculations.

Understanding these numbers might seem like extra work, but it's the most powerful way to shift from guessing to making informed decisions. It gives you clarity on where to invest, where to cut, and how to build a business that truly thrives.

— Samuel