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Duration Calculator

加减汇总时长（h:mm 或小数小时）。

Add, subtract, and sum work durations across rows. Enter h:mm (e.g. 8:30) or decimal hours (e.g. 1.5). For unit conversion, use Duration Converter.

Total (h:mm)
9:15
Decimal hours
9.25
h:mm:ss
9:15:00
Total minutes
555
Rows used
3

关于Duration Calculator

Timesheets and work logs need add/subtract aggregation across blocks—not unit conversion between seconds and minutes. Enter +/− and a duration per row. Accepts h:mm, h:mm:ss, or decimal hours (e.g. 1.5 = 1h 30m). Totals show as h:mm, decimal hours, and total minutes. For converting among ms/sec/min/hour/day/week only, use Duration Converter. Everything runs in your browser.

使用方法

  1. Pick + or − on each row and enter a duration (8:30 or 1.5)
  2. Add rows for more work blocks as needed
  3. Review the h:mm total and decimal hours

常见问题

Which formats are supported?

h:mm (e.g. 8:30), h:mm:ss, and decimal hours (e.g. 1.5). Minutes and seconds must be 0–59.

How is this different from Duration Converter?

This tool aggregates rows with add/subtract. For converting among time units only, use Duration Converter.

Is my input sent anywhere?

No. All calculation runs in your browser.