Written and reviewed by FormulaCraft Team. Each formula on this page is run through our verification engine before publishing.
Last reviewed:
How to calculate percentage complete in Excel and Google Sheets
Topic:PercentagesExcel & Google Sheets
=B2/C2✓
Verified example
Computed by a real spreadsheet engine on the sample data below.
| Task | Completed | Total |
| Design | 8 | 10 |
| Development | 15 | 30 |
| Testing | 3 | 10 |
| Deployment | 0 | 5 |
=B2/C2→0.8
Try it with your data
Edit the grid or formula, then run it through a real spreadsheet engine — no signup.
Sample data — click any cell to edit
Runs server-side · free · no signup
Step by step
- 1Set up columns for Completed (e.g. B) and Total (e.g. C).
- 2In a result cell (e.g. D2), type =B2/C2.
- 3Press Enter, then format the cell as a Percentage.
- 4Copy the formula down for all tasks or projects.
Tips
- Use conditional formatting to highlight rows where percentage complete is 100% (green) or below 50% (red) for an at-a-glance status view.
- To auto-count completed tasks, use COUNTIF: =COUNTIF(B2:B6,"Done")/COUNTA(A2:A6).
Need it for your exact data?
Describe your columns in plain English and get the precise formula for your sheet, with the right Excel or Sheets syntax.
Frequently asked
How do I handle the case where Total is zero?
Use =IFERROR(B2/C2,0) to return 0% when the total is zero, avoiding a #DIV/0! error.
Can I calculate overall project completion from multiple tasks?
Yes — use =SUM(completed_range)/SUM(total_range) to aggregate across all tasks.
More on Percentages
See all →How-to
How to calculate a percentage
Work out what percentage one number is of another with a simple division, then format the result as a percent. Same in Excel and Google Sheets.
Error fixFix Wrong %
Fix wrong percentage results in Excel and Google Sheets — caused by conflating the percentage symbol with the decimal value or double-applying the % format.
How-toHow to calculate percentage change
Find the percentage increase or decrease between two numbers with (new − old) / old, then format as a percent. Works in Excel and Sheets.
How-toHow to add a percentage to a number
Increase a number by a percentage with number × (1 + rate) — handy for tax, markup, or raises. Same in both apps.
How-toHow to calculate a cumulative percentage
Use a running SUM divided by the total SUM to build a cumulative percentage column in Excel or Google Sheets.
How-toHow to calculate attendance percentage
Divide attended sessions by total sessions and multiply by 100 to get attendance percentage in Excel or Google Sheets.