Gantt chart vs. spreadsheet
Spreadsheets are great at math. Schedules are different: dates depend on each other, holidays exist, and everything changes every week.
Updated July 2026 · 6 min read
The real problem: a spreadsheet doesn't know what a delay is
In Excel, every start date is a typed value. When task 3 slips by two days, nothing happens automatically: you have to remember which tasks depended on it and retype each date by hand.
On a 60-row schedule, a single delay usually means dozens of manual edits — and that's when the schedule starts lying. The sheet still looks tidy, but it no longer matches the project.
Business days, weekends and holidays
Project effort is counted in business days. A 5-day task starting on a Thursday ends the following Wednesday, not on Sunday. Getting that right in a spreadsheet means NETWORKDAYS.INTL, a hidden holidays tab and the discipline to maintain both.
Great Gantt handles business days and holidays natively: you enter the effort, and it computes real start and finish dates.
Predecessors and automatic recalculation
Type "2;5" in the predecessors field to say a task starts only after rows 2 and 5 finish. Change a date upstream and the whole chain repositions itself, summary rows included.
It also validates cycles: if A depends on B and B depends on A, you get a warning instead of an impossible plan.
When a spreadsheet still wins
For a 10-item checklist with no dependencies, a budget, or a one-off numeric analysis, spreadsheets are unbeatable — fast, flexible, and everyone already has one.
The switch pays off once you have dependencies, several people editing at the same time, and stakeholders who need a status view they can actually read.
Side-by-side comparison
| Everyday task | Spreadsheet | Great Gantt |
|---|---|---|
| Shifting dates after a delay | Manual, row by row | The chain recalculates itself |
| Counting business days | Formulas plus a holidays tab | Built in, holidays included |
| Task dependencies | Only in the author's head | Predecessors field "2;5" |
| Phase / group dates | Manual MIN/MAX | Automatic summary tasks |
| Something to present | Improvised bar shapes | Gantt with arrows and a today marker |
| Team collaboration | Versions over email | Real-time editing |
Move your schedule over in minutes
Start from the template closest to your project and adjust the effort — the dates take care of themselves.