Add and subtract hours:minutes durations — timesheets, shifts, project totals. Sum 7:30 + 8:15 correctly — free, local, no signup.
Add hours and minutes to any time — shift schedules, compute end times, total durations. Add 8h30m to 9:00 for shift end — free, local, no signup.
Count down the time until any future moment in days, hours, minutes, and seconds — launches, deadlines, events. See 45 days to launch live — free, local, no signup.
Add or subtract days, weeks, months, and years from any date — calendar-accurate. Find 100 days from hire date exactly — free, local, no signup.
Add sales tax to prices instantly by rate — checkout totals, quotes, and receipts. Price a $49 item at 8% correctly — free, local, no signup.
Convert between time units including seconds, minutes, hours, days, weeks, months, and years with precise decimal results. Input never leaves your device — everything runs locally in your browser.
7:30 + 8:15 = 15:45, not 15.45 — sexagesimal carries confuse decimals. This tool carries minutes correctly past 60.
Chain daily entries: five 7:30 shifts total 37:30. Overtime thresholds compute from true totals.
No — math runs locally in your browser. Numbers never leave your device.
Work Hours Calculator
Calculate total work hours for a single shift between start and end times with one configurable break. Essential for timesheets and payroll. Numbers never leave your device — every calculation runs locally in your browser.
Time Duration Calculator
Calculate the exact duration between two times. Handles overnight time spans and displays results in hours, minutes, and seconds. Numbers never leave your device — every calculation runs locally in your browser.
Last updated October 2026