How to create a spreadsheet in Excel

Start with the question the spreadsheet has to answer

Most spreadsheets go wrong before the first cell is filled, because the layout is invented as data arrives. Decide what one row represents — one order, one transaction, one employee — and every later decision about columns, formulas and charts follows from that.

Set up the sheet

• Put one header per column in row 1, with short, specific names.
• Freeze row 1 so headers stay visible while scrolling.
• Turn the range into a table so formats and formulas extend automatically.
• Give each column a single type: dates as dates, amounts as numbers.
• Keep one record per row and never merge cells inside the data.
• Leave no blank rows or columns inside the range.

Add the formulas that do the work

• Row-level maths belongs in the data rows, for example quantity times price.
• Use SUMIFS and COUNTIFS for totals by category or month.
• Use XLOOKUP to pull matching values from a reference tab.
• Reference rates and assumptions from a single cell, not typed repeatedly.
• Wrap risky lookups in IFERROR so blanks do not show as errors.

Separate input, calculation and reporting

Keep the rows you type into on one tab, the aggregation formulas on a summary tab, and the charts on a dashboard tab. Once totals are mixed into the data rows, sorting and pasting new data quietly breaks them — which is how most spreadsheets die.

Make it readable

• Style the header row and mark input cells in a distinct colour.
• Apply number formats to whole columns rather than to single cells.
• Set column widths so nothing shows as hashes or gets cut off.
• Add filters, and sort by the column a reader would check first.
• Name each tab for what it holds, not Sheet1 and Sheet2.

Or let AI build the first version

Describing the sheet you need is faster than building the skeleton by hand. Sehnna generates the tabs, headers, formats and formulas in one step, and you keep editing from there — in the browser, in Excel, or in Google Sheets.