MiniToolDesk
Zero Server Storage
Add and subtract durations in days, hours, minutes, and seconds cleanly.
Duration A
Duration B
Total Normalized Duration
04:21:15
0 Days, 4 Hours, 21 Minutes, 15 Seconds
Decimal Hours
4.3542 Hours
Total Minutes
261.25 Minutes
Total Seconds
15,675 Seconds
Perform exact duration arithmetic adding or subtracting HH:MM:SS intervals, compute total hours/minutes/seconds for timesheets or video timelines, and batch-sum multiple durations.
Converts inputs to total seconds (86400·d + 3600·h + 60·m + s), performs integer arithmetic, and re-normalizes.
Perfect for podcast/video editing timestamps, aviation logs, and weekly timesheet summing.
Any computed result automatically displays total decimal hours (for example, 2h 45m = 2.75 hours) ready to copy into invoices.
Count days & business days between dates or add/subtract days, weeks, months, years.
Find exact chronological age in years, months, days, hours, and next birthday countdown.
Convert hourly, daily, weekly, bi-weekly, monthly, and annual pay rates.
Add, subtract, multiply, and divide fractions & mixed numbers with step-by-step LCD.