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Project planning and programming time converter for seconds, minutes, hours, days, weeks, months, and years using Gregorian averages.
Unit
Generated on May 23, 2026
Project planning and programming time converter for seconds, minutes, hours, days, weeks, months, and years using Gregorian averages.
A time-unit converter switches between seconds, minutes, hours, days, weeks, months, and years. It is useful for project planning (converting a 45-day deadline to business weeks), programming (translating seconds into hours for reports), fitness (splitting training hours across a year), and everyday questions like 'how many hours in a week?
Formula
Target = Source × (source_to_sec ÷ target_to_sec). 1 year ≈ 31,556,952 s. 1 month ≈ 30.44 days.Time conversions sound mundane until you're staring at a backend log that says "cache_ttl: 2592000" and have to figure out whether that's 30 days or 30 years. Or you're calculating how long a 45-day sprint plan covers in actual work weeks (it's 6.4, accounting for weekends — which is why "45 days" deadlines silently slip). Or you're working out whether the 1-year warranty on your iPhone covers a screen that cracked 13 months in (it doesn't, and the warranty period is exactly 365 days from purchase, not "about a year"). The mathematically uncomfortable truth is that months don't have a fixed length — 28, 29, 30, or 31 days depending on which one — so this converter uses the averaged 30.4369 days per month to make round-trips clean, which is fine for most planning but wrong if you need exact calendar accuracy (rent, salary periods, contractual deadlines). For those use cases, switch to the Date Difference Calculator which respects real calendar lengths. Useful programming benchmarks: 86,400 seconds in a day, 604,800 in a week, 31.5 million in a year, and π × 10⁷ is the famous physics approximation accurate to half a percent. Memorise these three numbers and 90 percent of your timeout-config decisions become mental math.
A time-unit converter switches between seconds, minutes, hours, days, weeks, months, and years. It is useful for project planning (converting a 45-day deadline to business weeks), programming (translating seconds into hours for reports), fitness (splitting training hours across a year), and everyday questions like 'how many hours in a week?'. Because calendar months vary in length (28 to 31 days), this converter uses the average month (30.4369 days) and the average year (365.2425 days, the Gregorian value) so that conversions round-trip cleanly between months and years.
The second is the SI base of time. Everything converts through it. An average Gregorian month is 30.4369 days — that's 365.2425 ÷ 12 — because the Gregorian calendar inserts a leap day every 4 years except in century years not divisible by 400. If you need calendar-month accuracy (say, rent for March vs. February), use the Date Difference Calculator instead, which respects individual month lengths.
Common time-unit conversions used in programming, fitness tracking, and project planning.
| Seconds | Minutes | Hours | Days | Weeks |
|---|---|---|---|---|
| 60 | 1 | 0.017 | 0.00069 | — |
| 3600 | 60 | 1 | 0.042 | 0.006 |
| 86400 | 1,440 | 24 | 1 | 0.143 |
| 604800 | 10,080 | 168 | 7 | 1 |
| 2629746 | 43,829 | 730.5 | 30.44 | 4.35 |
| 31556952 | 525,949 | 8,765.8 | 365.24 | 52.18 |
1 hour (3,600 sec) is about the time it takes to cook a roast — or read 50 pages of a novel.
1 week (604,800 sec) is the typical sprint duration in software development methodology.
1 year (31.5 million sec) ≈ π × 10⁷ seconds — a famous physics mnemonic that's accurate to 0.5 %.
A human heart beats ~3 billion times in 80 years — an average of about 1 beat per second.
1 week contains exactly 604,800 seconds — a useful benchmark when measuring long-running processes.
1 year contains approximately 8,766 hours (average) — helpful for calculating annualized rates.
1 hour is exactly 3,600 seconds — a fundamental conversion in physics and engineering.
30 days is roughly 4.29 weeks — useful when translating monthly deadlines into weekly sprints.
A century is approximately 3.156 × 10⁹ seconds — the kind of number used in long-term astrophysical and geological calculations.
1 month of uptime at 99.9% reliability allows only about 43.2 minutes of downtime — a key SLA number for web services.
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