KPIs. The few numbers that tell you whether the business is heading where it should.
A KPI (key performance indicator) is a number that measures how close a business is getting to a specific goal, over a specific period. Every KPI is a metric, and only a few metrics deserve to become KPIs.
A KPI has four parts: what it measures, how it's calculated, how often it's read, and what the target value is. Without the target, it's just a statistic.
What gets measured shapes behaviour. Robert Kaplan and David Norton opened their 1992 Harvard Business Review article with this line: “What you measure is what you get”.
Small Italian businesses still read their numbers very little: 12.2% of businesses with 10 to 49 employees use business intelligence software, against 70.3% of large ones, according to Eurostat for 2025.
This entry is part of the AI and automation glossary, where every term has a short definition. Here the definition goes further: the parts of a KPI, seven examples with their formulas, how many to choose, how they differ from metrics and SLAs, and how to read them without recalculating by hand.
What KPIs are
A KPI is an indicator chosen because it measures a goal that matters, and read at fixed intervals. Monthly turnover is a metric. It becomes a KPI when there's a written target next to it, someone reading it every Monday, and a decision that changes if the number drifts from where it should be.
A KPI has four parts. The name: what it measures. The formula: how it's calculated and from what data. The frequency: how often it's read. The target value: where it has to get to, and by when. An indicator missing any of the four produces arguments in meetings rather than decisions.
Where the idea comes from
In January 1992, Robert Kaplan and David Norton opened their Harvard Business Review article on the balanced scorecard with one line: “What you measure is what you get”. A company's measurement system, they wrote, strongly affects the behaviour of the people who run it and the people who work in it.
In the same article they noted that traditional financial measures, such as return on investment, can give misleading signals about improvement and innovation. Hence the idea of setting customer and process numbers alongside the financial ones: they move before turnover does, and tell you in advance where it's heading.
Seven KPI examples, with their formulas
Seven indicators cover the four areas almost every small business has: sales, customers, operations, admin. The formula is the part that matters: two people calculating the same KPI in different ways will get two numbers, and end up arguing about the number instead of the business.
| KPI | How it's calculated | What it says |
|---|---|---|
| Conversion ratesales | Quotes accepted divided by enquiries received, in the month. |
How many enquiries turn into customers. If it drops, the problem lies between the enquiry and the quote. |
| Average order valuesales | Turnover for the period divided by number of orders. |
Whether customers are buying more or less with each order. |
| Time to first replycustomers | Median time between an enquiry arriving and the first reply from a person or the system. |
How long the people who write to you wait. It's the first number a customer notices. |
| Repeat purchase ratecustomers | Customers who bought again divided by active customers in the same period of the previous year. |
How many customers come back. Its opposite is churn. |
| On-time deliveryoperations | Orders delivered by the promised date divided by orders delivered. |
Whether the promise made to the customer is kept. |
| Average collection periodadmin | Trade receivables divided by turnover for the period, multiplied by the days in the period. |
How long it takes from invoice to money in the bank. |
| Overdue as a share of the totaladmin | Invoices overdue and unpaid divided by total trade receivables. |
How much of what you're owed is already late, and needs chasing. |
How many KPIs you need, and which to drop
One question decides the right number: for each indicator, which decision changes if the number moves? If the answer is none, the indicator comes off the list. The owner reads the business's KPIs; each person reads the ones they can act on, and only those.
The opposite risk has a name, the vanity metric: a number that grows and is nice to look at, like website visits or followers, but doesn't tell you whether the business is making money. Two questions give it away. If it doubled tomorrow, what would you do differently? And which of your customers would notice?
How to read them without recalculating by hand
A KPI is useful if it reaches the person who decides already calculated, always at the same interval. In 2025, according to Eurostat, 16.0% of Italian businesses with at least 10 employees used business intelligence software: 12.2% of small ones and 70.3% of large ones. According to Istat, 41.9% of SMEs and 83.6% of large businesses carry out data analysis.
The real work happens upstream. The data the KPI is calculated from has to arrive by itself: from the business software, the CRM, the inbox. An indicator someone has to recalculate by hand every Monday soon stops being read, and so does the decision it was meant to produce.
KPIs and SLAs
A KPI measures an internal goal; an SLA, service level agreement, is a level of service promised to someone else, often written into a contract. The same number can be both. Time to first reply is a KPI if it's the department's goal, and becomes an SLA when it's promised to the customer, for example a reply within 24 hours.
How Itria uses it
Itria's Cruscotto is a page of KPIs: the numbers that matter for that business, calculated every day from data that already exists and readable in a few minutes. Monthly reporting delivers the same numbers on the first of the month, in a letter for the owner and a file for the accountant.
Before building, we choose together which numbers go in, and set a baseline: today's value, before anything changes. It's the first of the principles set out in Ethics, “Diagnosis before solution”: without a starting value, no improvement can be proved.
Related terms
Vanity metric
The number that grows and reassures without changing any decision. The opposite of a KPI.
Time to first reply
The time between an enquiry arriving and the first reply. It's the KPI a customer notices first.
CRM
The software for customer relationships. The sales KPIs come out of it, if the data flows in by itself.
SLA
The level of service promised, often by contract. It's measured with the same numbers as a KPI.
Questions and answers
What are KPIs in simple terms?
KPIs, key performance indicators, are the few numbers that tell you whether a business is getting closer to its goals. Every KPI has four parts: what it measures, how it's calculated, how often it's read, and what the target value is.
Monthly turnover becomes a KPI when there's a written target next to it and someone reading it at fixed intervals.
What's the difference between a KPI and a metric?
A metric is any number you can measure: website visits, phone calls, orders. A KPI is a metric chosen because it measures a goal that matters, with a target value and a decision that changes if the number drifts.
Every KPI is a metric; few metrics deserve to become KPIs. A number that keeps growing and never changes any decision is a vanity metric.
What are some examples of sales KPIs?
The enquiry conversion rate: quotes accepted divided by enquiries received in the month. Average order value: turnover divided by number of orders.
Time to first reply: the median time between an enquiry arriving and the first reply. Repeat purchase rate: customers who bought again divided by the previous year's active customers.
How many KPIs should a small business have?
Few, and one question decides the right number: for each indicator, which decision changes if the number moves? If none, the indicator goes. An owner reads the business's KPIs, each person reads the ones they can act on.
A long list produces arguments instead of decisions, and an indicator recalculated by hand every week soon stops being read.
What's the difference between a KPI and an SLA?
A KPI measures an internal goal of the business. An SLA, service level agreement, is a level of service promised to someone else, often written into a contract.
The same number can be both: time to first reply is a KPI if it's the department's goal, and becomes an SLA when it's promised to the customer, for example a reply within 24 hours.
Notes on sources
- The line and the two observations come from Robert S. Kaplan and David P. Norton, The Balanced Scorecard: Measures that Drive Performance, Harvard Business Review, January-February 1992, in the part of the article that's freely available, read on 26 September 2026.
- The shares of businesses using business intelligence software come from Eurostat's 2025 survey on ICT usage in enterprises, dataset isoc_eb_iip, and from the page E-business integration. They cover businesses with 10 or more employees.
- The data analysis shares come from Istat, Imprese e ICT, 2025 (in Italian): analysis carried out by in-house staff or external organisations, businesses with at least 10 employees.
- The seven formulas are the standard definitions of these indicators, written for a small business. If you adopt them, write down the period and the source data, so the number can be recalculated the same way.
You already have the numbers. It's a matter of getting them to you every morning, already read.
The first step with Itria is a fifteen-minute video call: we look at which numbers decide your month, and where they can be taken from without recalculating them by hand. Drop us a line about what's slowing you down. We'll make the first move: we'll look at what a customer sees when they search for you, and tell you what we found. Even if we never end up working together.