Time Converter
Convert seconds, minutes, hours, days, weeks, months and years.
- Instant
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Millisecond (ms)
Second (s)
| Unit | 1 ms equals |
|---|---|
| Millisecond (ms) | 1 |
| Second (s) | 0.001 |
| Minute (min) | 0.0000166667 |
| Hour (h) | 2.77778e-7 |
| Day (d) | 1.15741e-8 |
| Week (wk) | 1.65344e-9 |
| Month (30d) (mo) | 3.85802e-10 |
| Year (365d) (yr) | 3.17098e-11 |
How it works
- 1 day = 86,400 seconds
- 1 year = 365 days
- 1 week = 168 hours
Popular time conversions
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Frequently asked
How many seconds in a day?
86,400 seconds.
Where you'll actually use this
Time converters handle durations — seconds, minutes, hours, days, weeks, months, and years. Useful for scheduling, project planning, and physics calculations.
- Project planning
Convert sprint durations between days and weeks; estimate hours-of-work against calendar time.
- Media & storage
Video durations, transcription time, and audio runtime often need conversion to total seconds for tooling.
- Science
Half-lives, orbital periods, and reaction times span femtoseconds to gigayears.
Common mistakes to avoid
- A month isn't a fixed length
Calendar months vary from 28 to 31 days. Converters typically use 30.44 days as an average.
- Year as 365 days
A Julian year is 365.25 days. Skipping the quarter introduces a day of error every four years.
Did you know?
Atomic clocks have added 27 leap seconds to UTC since 1972 to keep civil time aligned with Earth's slowing rotation.
What people do next
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Accuracy & sources
How this tool is built and verified.
- Source
- Standards-aligned factors
- Last reviewed
- Q2 2026
- Status
- Verified
- International System of Units (SI)BIPM — Bureau International des Poids et Mesures · The International System of Units (SI Brochure), 9th edition
- ISO 80000 — Quantities and UnitsISO / IEC · ISO 80000-1:2022
- Standards aligned
- Formula verified
- Editor reviewed
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