Hours to Decimal Calculator
Add every duration. See total decimal hours & pay.
Stack as many H:MM:SS rows as you need — the decimal hours total updates on every keystroke, and an optional hourly rate turns it into gross pay instantly.
Add durations
Total
4.50 decimal hours
= 4:30:00
Total pay
$112.50
The math
Sum first, convert once.
total = Σ (hours + minutes ÷ 60 + seconds ÷ 3,600)
2:45 + 1:15 + 0:30
= 2.75 + 1.25 + 0.50 = 4.50 decimal hoursBecause each row is already decimal, the addition is plain arithmetic — that is the entire point of decimal time. The calculator still works internally in seconds so long lists never accumulate floating-point error.
Guide
From scattered entries to one invoice line.
Freelancers rarely bill one clean block. A Tuesday might be 1:20 for calls, 0:50 for revisions, and 2:15 for drafting — three durations in clock form, one number when invoiced. Converting each entry and summing gives 1.33 + 0.83 + 2.25 = 4.42 decimal hours, which multiplies directly by your rate.
Doing this by hand invites two classic errors: treating 0:20 as 0.20 instead of 0.33, and rounding each entry differently before adding. Our hours to decimal calculator avoids both by converting exactly and rounding only the final display.
For recurring weekly work — with clock punches rather than raw durations — the timesheet calculator automates the same pipeline day by day, including FLSA-compliant rounding.
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