By Intious · Updated September 10, 2026
Choose one input format, preserve the original durations, and export both row conversions and a reconciled total. This workflow works with a copied column of elapsed times.
Try the calculator with your own figures.
Identify what the column actually contains
A timesheet can store clock times, elapsed durations, spreadsheet time serials or decimal hours. Those are not interchangeable. The bulk converter accepts elapsed durations such as 8:15 or decimal hours such as 8.25. It does not subtract start and finish times. If you have clock-in and clock-out records, first calculate each elapsed duration and apply any break treatment required by your workflow.
Prepare a clean column
Copy one numeric duration per line without the column heading, employee names, currency symbols or totals. Select H:MM for 8:15 and decimal hours for 8.25. A row such as 8:75 is invalid because the minute field must be between 00 and 59. The converter reports the offending row rather than quietly treating it as a different duration. Long durations such as 27:30 are allowed and convert to 27.5 hours.
Run a small reconciliation example
Use 7:30, 8:15 and 6:45 as a check. These rows contain 450, 495 and 405 minutes, totaling 1,350 minutes. Divide by 60 to obtain 22.5 hours. The individual decimal results are 7.5, 8.25 and 6.75, so their sum also equals 22.5. This example has no two-decimal rounding difference. Follow it with three 0:10 rows to verify that your workflow can expose a difference when one exists.
Import the CSV deliberately
Download the result and use your spreadsheet import controls to confirm column types. Some applications automatically interpret H:MM as a time value, so use the decimal-hours column when that is what the destination expects. Review the summary separately from the row data; do not sum a column that includes both individual results and summary totals. The export includes unrounded decimal values as well as the selected display precision.
Keep an audit-friendly source copy
Retain the original file, the conversion date, the input format and the precision selected. Do not add personal identifiers when you only need arithmetic. If decimal values were rounded before you received them, conversion back to H:MM is an approximation of those supplied decimals, not recovery of the original time record. The tool labels the H:MM output as nearest-minute time so that distinction remains clear.
Frequently asked questions
Can I paste 500 rows at once?
Yes, up to 500 durations. Larger files can be split into separate batches; reconcile the combined source totals before using them.
What is 0.10 of an hour?
It is 6 minutes because 0.10 × 60 = 6. Ten minutes is approximately 0.1666667 hours.
Does 30 minutes equal 0.50 hours?
Yes. Half of 60 minutes is 30, so 30 minutes equals 0.50 decimal hours exactly.