Does moving to BI mean we stop using Excel?

No. Excel stays for quick analysis and calculations. BI takes over the recurring reports and the numbers the whole company uses, and Excel can connect to the same source.

Which BI tool should we start with?

The tool matters less than people expect. Power BI is a common choice if you already use Microsoft 365, but first you need to agree on definitions and data sources. That holds for any tool.

Is BI only for large companies?

No. A small company with data in an ERP, a webshop and a few spreadsheets often gains more than a large one that runs everything in a single system.

Excel or BI: how to tell your company has outgrown spreadsheets

Monday morning, management meeting. Sales says last month went well. Finance has a different number. Someone else opens their own file “just to check”. Half an hour later, the only thing everyone agrees on is that it all needs checking again.

If that sounds familiar, the problem is probably not the people. Often it is not even Excel.

Excel is a great tool. It is fast, everyone knows it, and you can put together a serious analysis in it in an afternoon. The trouble starts when spreadsheets slowly turn into the place where the company keeps its “official” numbers.

Signs you have outgrown spreadsheets

Same number, different values. Each team exports data at a different time and calculates by its own rules. Nobody gets it wrong on purpose, but the figures do not match.

Reports take days. Export from the ERP, then from the webshop, paste into the master file, fix the formulas that broke. Little time is left for the analysis itself.

Only one person understands the file. While that person is around, everything works. When they go on holiday, the report waits.

The file keeps getting slower. It takes minutes to open, crashes on refresh, or has already been split into “part 1” and “part 2”.

Every follow-up question is a new job. “Which customers caused the drop?” should not mean a new file and two days of work.

Decisions wait for a check. This is the most expensive sign. The numbers exist, but nobody trusts them enough to act on them.

If you recognise two or three of these, a change is worth thinking about.

The same data, two ways of working: without a shared source each team builds its own file, with BI every report takes its numbers from one model.

What actually changes with BI

The tool matters less than people expect. What matters is where the numbers come from.

Instead of everyone exporting data for themselves, the systems connect to one place. There you agree once on what counts as revenue, when an order is final and how returns are handled. Every report then takes its data from there.

It sounds modest, and it is. But afterwards the meeting is about what the numbers mean, not about whose numbers are right. You can see what this looks like in practice in the BI and data engineering projects.

	Excel	BI
Where data comes from	Manual exports, file by file	Direct connection to your systems
Refresh	Someone has to do it	Automatic, on a schedule
Calculation rules	In each file’s formulas	In one place, for everyone
Follow-up questions	A new file or a new column	A filter or a click on a chart
Best for	Quick, one-off analysis	Numbers the whole company uses

How to start without a big project

You do not have to do it all at once. The best start is one report that many people use and everyone finds painful.

Pick that one report, for example monthly sales by product and region.
Sit down with the people who use it and write down the definitions. What exactly counts as revenue? From which date does an order count?
Connect the sources directly, without manual exports.
Build the report on that data, with filters, so follow-up questions do not need a new file.
Put it to use and listen to what people ask. That is where the next report comes from.

The second report goes faster than the first, because it uses the same data and the same rules.

If you want help with that first step, see BI, data engineering and analytics or get in touch and describe the report that bothers you most.

When Excel is still the right choice

Whenever you are working something out for yourself: a quick estimate, a what-if scenario, a one-off analysis. Excel does not get thrown out. It just stops being the place that holds the numbers the whole company relies on. And when you need it, it can connect to the same source as the reports.