Time Seconds ↔ Minutes / Hours

Convert seconds to days/hours/minutes/seconds; auto-format hh:mm:ss.

Result

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How to use this calculator

Pick what you have (seconds, minutes, hours, or parts).
Enter value.
Read all formats.

About this calculator

Time conversions are mechanical: 60 s/min, 60 min/hr, 24 hr/day. Auto-formatting to hh:mm:ss is most useful: 3725 seconds = 01:02:05. Programmers use Unix epoch seconds (since 1970-01-01). Astronomy uses Julian date. Long-duration projects: count in millions of seconds (1M s ≈ 11.6 days).

Frequently asked

How many seconds in a year?+

~31.5 million (31,536,000). Calendar year. Sidereal: 31,558,150.

Minute = 60 seconds always?+

Civil time: yes. Atomic clocks occasionally insert "leap seconds" — minute can be 61 sec.

hh:mm:ss with > 99 hours?+

Some formats overflow (hh exceeds 99). For very long durations, use days+ instead.

Negative time?+

For deltas: yes (countdown, time-since-event). Always-positive durations: no.

Frame rates?+

Video uses time × frame rate. 30fps × 1 hr = 108,000 frames. Time-of-day relative to media playback.

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Wind Speed mph ↔ Knots

1 knot = 1.15078 mph = 1.852 km/h. Bidirectional, also m/s.

Temperature Rankine ↔ Fahrenheit

R = F + 459.67. Rankine is absolute (0 = absolute zero); Fahrenheit + 460.

Pressure psi ↔ bar

1 bar = 14.5038 psi = 100 kPa = 0.987 atm.

Pressure bar ↔ atm

1 atm = 1.01325 bar = 14.696 psi.

Density g/cm³ ↔ kg/m³

1 g/cm³ = 1000 kg/m³. Water = 1 g/cm³ = 1000 kg/m³.

Viscosity Units Converter

Pa·s ↔ cP (centipoise) ↔ Poise. 1 Pa·s = 1000 cP = 10 Poise.

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Wind Speed mph ↔ Knots

1 knot = 1.15078 mph = 1.852 km/h. Bidirectional, also m/s.

Temperature Rankine ↔ Fahrenheit

R = F + 459.67. Rankine is absolute (0 = absolute zero); Fahrenheit + 460.

Pressure psi ↔ bar

1 bar = 14.5038 psi = 100 kPa = 0.987 atm.

Pressure bar ↔ atm

1 atm = 1.01325 bar = 14.696 psi.

Density g/cm³ ↔ kg/m³

1 g/cm³ = 1000 kg/m³. Water = 1 g/cm³ = 1000 kg/m³.

Exact age in years, months, days, hours, and minutes — plus countdown to next birthday.