Decimal Hours Calculator
Convert clock-style durations to decimal hours for timesheets and payroll systems — with live sync and batch export.
Single conversion
Updates live when the paired value is valid.
Hours:minutes (e.g. 8:30). Decimal hours use a point (e.g. 8.5).
Batch conversion
Enter hours:minutes per row (same Time format as single conversion); decimal hours update live. Export CSV after at least one valid row.
| Hours:minutes | Decimal hours | Remove row |
|---|---|---|
| — | ||
| — | ||
| — |
Ready when you convert
Enter a conversion to see results, or add a valid batch row to export CSV.
How it works
A decimal hours calculator converts clock time (hh:mm) to payroll decimal hours and back. Enter hours and minutes (for example 8:30) or decimal hours (for example 8.5). Valid entries update the paired field immediately. Use the batch table for multiple rows and export CSV when you are ready.
Formula: decimal hours = total minutes ÷ 60, rounded to the nearest minute when converting from decimal back to hh:mm. Remember: 8.5 means 8:30, not 8:50.
Quick steps
- Enter hours and minutes (hh:mm) or a decimal hours value.
- Watch the paired field update live when the entry is valid.
- Add batch rows for multiple conversions on one screen.
- Export CSV for spreadsheet paste (plain values, no formulas).
- Use Hours & Minutes instead if you need to add or subtract durations.
When to use this tool
Use Decimal Hours for unit conversion only — when payroll or a spreadsheet expects 8.5 instead of 8:30. Use Hours & Minutes to add or subtract duration rows, and Timesheet when you already work in decimal hours on a weekday grid and need row/column totals plus CSV rather than a one-off conversion.
Common mix-up: people treat the digits after the decimal as minutes. They are fractional hours, so 0.25 is fifteen minutes and 0.75 is forty-five minutes. The live pair field and the 8.5 ≠ 8:50 FAQ are there to catch that before you export.
Worked example
8:30 → 8.5 decimal hours. 8:50 → about 8.83 decimal hours. Batch three payroll rows and export CSV for spreadsheet paste — values only, without spreadsheet formulas.
Methodology & assumptions
Conversions use integer minutes internally: decimal = minutes ÷ 60; reverse conversion rounds to the nearest whole minute. This tool does not add or subtract duration rows — use Hours & Minutes for that. See calculation methodology.
FAQ
- Is 8.5 the same as 8:50?
- No. 8.5 decimal hours is 8:30. Eight hours and fifty minutes is about 8.83 decimal hours.
- Where is my data stored?
- Decimal Hours runs locally in your browser. Only display preferences may be saved on this device — conversion rows are not uploaded.
- Can I export a batch for spreadsheets?
- Yes. Use Export CSV on the batch table to download plain hh:mm and decimal values with formula-injection neutralization for safe paste.
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