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Every Second Calculator
Break any span of time down into every last second, plus the equivalent minutes, hours, and days.
yrs
days
hrs
min
What this calculator does
Enter a length of time in years, days, hours, and minutes, and this tool converts it entirely into seconds, along with the equivalent totals in minutes, hours, and days.
The math
Everything is converted to a common unit of days first (using 365.25 days per year to account for leap years), then multiplied out: days × 24 = hours, hours × 60 = minutes, and minutes × 60 = seconds.
This is a straightforward unit-conversion tool for curiosity, scheduling, or any project where you need an exact second count for a given duration.
Last reviewed August 2026