1 s in every unit
Values update with the converter above. Select a row to open that conversion's detailed page.
- Millisecond1,000 ms
- Minute0.01666667 min
- Hour0.0002777778 h
- Day0.00001157407 d
Popular conversions
4 pairsSecond ↔ Hour
s ↔ h
Minute ↔ Hour
min ↔ h
Day ↔ Hour
d ↔ h
Second ↔ Millisecond
s ↔ ms
Unit guides
5 unitsDetailed guide to Time
Time is one of the SI base quantities and is essential in physics, engineering, navigation and ordinary planning.
Seconds, minutes, hours and days appear together in practical calculations for rates, speed, energy use, process duration and schedules. This converter is for duration, not for time-zone or calendar-date conversion.
- Physical quantity
- Time
- SI base unit
- Second
- SI symbol
- s
- Dimension symbol
- T
- Typical use
- Durations, rates and schedules
Durations, dates and clock time
Seconds, minutes, hours and days describe durations. Calendar dates, time zones and daylight-saving changes are separate problems and should not be inferred from a plain duration conversion.
Use a consistent time unit before calculating a rate, pace, frequency or data-logging interval. The related tools handle age, pregnancy-week and sleep-planning contexts separately.
What is time?
Time describes duration and the ordering of events.
It appears in speed, acceleration, frequency, energy use, production cycles and many measured rates. When a quantity is expressed 'per second' or 'per hour', time is part of its unit.
Seconds, minutes, hours and days
The second is the SI base unit of time. Minutes and hours remain standard practical units built on exact relationships.
One minute equals exactly 60 seconds, one hour equals exactly 3,600 seconds, and one day equals exactly 86,400 seconds in this duration conversion. Milliseconds are useful for short events, instrumentation and digital timing.
Duration is not always a calendar period
A fixed duration can be converted reliably with multiplication or division by exact factors such as 60, 3,600 and 86,400. That makes seconds, minutes, hours and days appropriate for experiments, schedules and rate calculations.
Months and years are not included as fixed duration units because calendar months have different lengths and leap years change the length of a calendar year. For deadlines and dates, use a calendar-aware tool rather than assuming every month has the same number of days.
Time in rate and energy calculations
Speed is distance divided by time, and power is energy divided by time. Keep the time basis visible when comparing values: a per-second rate and a per-hour rate are not directly comparable until one is converted.
For example, a device rated at 1 kW uses 1 kWh only after operating for one hour at that rate. Converting the duration first helps prevent mixing power with energy.
Unit comparison table
| Unit | Symbol | SI equivalent | System | Common use |
|---|---|---|---|---|
| Millisecond | ms | 0.001 s | SI/metric prefix | Digital timing, instruments and short events |
| Second | s | 1 s | SI base unit | Science, timing and general duration measurement |
| Minute | min | 60 s exactly | Accepted with SI | Schedules, media and everyday duration |
| Hour | h | 3,600 s exactly | Accepted with SI | Work, travel, energy use and planning |
| Day | day | 86,400 s exactly | Calendar-based practical unit | Daily duration, forecasts and schedules |
Time units
| Unit | Symbol | Information |
|---|---|---|
| Second | s | View unit guide |
| Minute | min | View unit guide |
| Hour | h | View unit guide |
| Day | day | View unit guide |
| Millisecond | ms | View unit guide |