15 KPIs Every Small Business Should Track (With Formulas)

The small business KPIs that matter most cover five things: sales, profit, cash, customers and efficiency. Track three numbers in each area and you have 15 KPIs that tell you, in about ten minutes a month, whether the business is healthier than it was last month. Below is the list, the formula for each and a worked example in rand.

A KPI (key performance indicator) is a number you have decided to watch because it tells you something important about whether you are hitting your goals. The word ‘key’ matters: if you track 60 numbers, none of them are key. Start with these 15, then drop the ones that do not change your decisions.

The 15 KPIs at a glance

Sales KPIs: is demand growing?

Revenue growth is the headline, but on its own it hides a lot. Pair it with average transaction value and conversion rate so you can see whether growth comes from more customers, bigger baskets or better selling. If revenue is flat but conversion is falling, your leads are getting weaker or your follow-up is slipping. For a deeper list, see our guide to sales KPIs.

Profit KPIs: are you keeping enough of it?

Gross margin tells you whether your pricing covers your direct costs with room to spare. Net margin tells you whether the whole business, overheads included, makes money. Break-even revenue turns both into a target: the monthly sales you need before you make a cent of profit.

Worked example

Say your shop sold R120,000 in March from 800 sales, up from R110,000 in February. Cost of sales was R72,000 and overheads (rent, salaries, software) were R38,000.

• Revenue growth: (120,000 − 110,000) ÷ 110,000 = 9.1%
• Average transaction value: R120,000 ÷ 800 = R150
• Gross margin: (120,000 − 72,000) ÷ 120,000 = 40%
• Net profit: 120,000 − 72,000 − 38,000 = R10,000, so net margin = 8.3%
• Break-even revenue: R38,000 ÷ 0.40 = R95,000 a month

That last number is the useful one. It tells you the business has R25,000 of headroom above break-even. A slow month that drops sales below R95,000 means a loss, which is worth knowing before it happens.

Cash KPIs: can you pay the bills?

Profitable businesses still run out of cash, usually because customers pay late or stock soaks up money. Cash runway tells you how many months you could survive if nothing improved. Debtor days tells you how long customers take to pay; if you invoice on 30-day terms and debtor days is 52, you are funding your customers. The current ratio compares what you can turn into cash within a year with what you owe in that time; below 1 is a warning sign. Our article on financial KPIs for owners goes into each one.

Customer KPIs: are people coming back?

CAC tells you what it costs to win a customer. On its own it means little, so compare it with what a customer is worth over time. Repeat customer rate is the cheapest growth lever most small businesses have: a returning customer costs almost nothing to acquire. CSAT is a simple survey score (‘Were you happy with your order?’) that flags problems before they show up in sales.

Continuing the example: you spent R9,000 on marketing in March and won 60 new customers, so CAC = R9,000 ÷ 60 = R150. If the average new customer comes back four more times at R150 a visit with a 40% margin, each one generates R240 of gross profit over those repeat visits, comfortably above what you paid to win them.

Efficiency KPIs: are you getting more from the same resources?

Revenue per employee shows whether the team is becoming more productive as you grow. Overhead ratio catches cost creep: subscriptions, rent increases and ‘temporary’ hires that became permanent. On-time delivery matters for any business that promises a date, from a caterer to a manufacturer. With R120,000 revenue and 4 staff, revenue per employee is R30,000 a month; overhead ratio is R38,000 ÷ R120,000 = 31.7%.

How to review your KPIs each month

1. Pull the same exports every month (sales, accounting, bank) so the numbers are comparable.
2. Put this month next to last month and the same month last year. Seasonality fools people constantly.
3. Mark each KPI as better, worse or flat, and write one sentence on why for anything that moved a lot.
4. Pick no more than two actions for the coming month. Too many actions means none get done.
5. Drop any KPI that has not influenced a decision in three months, and replace it with one that would.

If pulling the exports and building the charts is the part that never happens, tools like Summarix can take a CSV or Excel file and produce the KPIs, charts and narrative for you, and send it on a schedule. The figures are computed from your data by code, so you are not relying on an AI to do arithmetic. A simple monthly business report template also helps keep the review consistent.

Conclusion

You do not need a data team to run a business on numbers. Fifteen well-chosen KPIs, reviewed monthly in the same format, will show you where the business is heading far earlier than your bank balance will. Start with this list, then use the principles in how to choose the right KPIs to trim it to the handful that drive your decisions.