How to Calculate Your Real Profit Margin

TL;DR

Revenue is everything you sold. Profit is what's left after every cost, and the two are easy to confuse when you're busy.

Real profit margin = (Revenue − Total Costs) ÷ Revenue × 100, and 'total costs' has to include the costs owners most often forget.

The three most commonly missed costs are your own unpaid time, small recurring expenses, and stock that was bought but not yet sold.

Once you calculate it properly once, the fastest way to keep seeing it is to have it calculated for you daily.

'Business was good today' usually means one thing: a lot of money came in. That's revenue, and it's the easiest number to feel good about because it's the one you see first, at the till or in your hand.

Profit is a different, harder number, and it's the one that actually determines whether the business is working. This is a step-by-step way to calculate it properly, once, so you know what a genuinely good day looks like versus a busy one.

Step by Step

How To Do It

1

Add up every naira that came in

This is your revenue: every sale, in cash, transfer or on account, for the period you're checking (a day, a week, a month). Include credit sales even before they're paid, since the sale happened even if the cash hasn't arrived yet.

Sold 3 cartons of noodles for 42k

2

Add up the direct cost of what you sold

This is what you paid, roughly, for the goods you sold this period, sometimes called cost of goods sold. If you sold rice you bought at ₦40,000 a bag for ₦48,000, your direct cost on that sale is ₦40,000, not ₦48,000.

3

Add up every other expense for the same period

Rent, transport, staff wages, electricity, data, small repairs. These aren't tied to a specific sale, but they're real costs of running the business during that period, and they belong in the calculation.

Paid rent ₦200,000

4

Subtract both cost categories from revenue

Revenue minus direct cost of goods minus other expenses equals your profit for the period. If that number is smaller than you expected, that's the real number, not the busy one.

5

Divide profit by revenue, then multiply by 100

This gives you your profit margin as a percentage. A ₦100,000 profit on ₦500,000 revenue is a 20% margin. The percentage matters more than the naira figure, because it tells you whether the business is efficient, not just busy.

Watch Out For

Common Mistakes

Forgetting your own time

If you're not drawing a salary but working full days, the business is quietly running on free labour. That's fine as a starting stage, but it means your 'profit' is really profit plus your own unpaid wage.

Missing small, recurring costs

Data bundles, transport, small repairs and bank charges rarely feel worth recording individually, but they add up to a real monthly total that most owners underestimate until they actually total it.

Counting unsold stock as a loss (or a gain)

Money spent on stock that hasn't sold yet isn't a cost against this period's sales; it's an asset sitting on your shelf. Mixing this into your profit calculation makes the number swing for reasons that have nothing to do with how the business actually performed.

Doing this calculation by hand once a month is useful. Doing it every single day is what actually changes decisions, because it's the only way to catch a slow week early instead of at month-end.

This is the exact calculation BOS Afora runs automatically from whatever sales and expenses you log, and delivers as part of the evening briefing every night, so the real number is always the one you see, not the busy one.

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Questions

FAQ

What's the difference between revenue and profit?

Revenue is everything you sold. Profit is what's left after subtracting the direct cost of what you sold and every other business expense for the same period.

What's a good profit margin for a small retail business?

It varies widely by trade; high-volume, low-margin retail (like a provision store) often runs on single-digit to low-teen percentages, while services or made-to-order goods can run much higher. The useful comparison is your own margin over time, not a universal number.

Do I count a credit sale in revenue before it's paid?

Yes, the sale happened and the goods left, so it counts as revenue. Just also track it as a debt owed, so you know it's still cash you haven't collected yet.

Is there a way to see this number without recalculating it manually?

Yes. BOS Afora calculates profit and margin automatically from the sales and expenses you log, and includes it in the daily and weekly briefing without you asking.