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.
FAQ