The Complete Guide to Time Conversions

Consider this the master page for time conversions. Below you'll find every supported unit explained, the precise factors connecting them, and computed tables you can rely on for homework, work or travel.

Prefer a calculator? Every conversion on this page has an instant, free tool — start at the tools hub or use the links under each unit below.

The units at a glance

Second (s)

The second is the SI base unit of time, defined by 9,192,631,770 oscillations of a cesium atom — the tick behind every clock on Earth.

• 1 s = 0.016667 minutes (min) — Second to Minute converter
• 1 s = 0.00027778 hours (hr) — Second to Hour converter
• 1 s = 0.00001157 days (d) — Second to Day converter
• 1 s = 0.00000165 weeks (wk) — Second to Week converter
• 1 s = 0.00000038 months (mo) — Second to Month (average) converter
• 1 s = 0.00000003 years (yr) — Second to Year (average) converter

Minute (min)

The minute — 60 seconds — descends from Babylonian base-60 arithmetic, which is also why circles have 360 degrees.

• 1 min = 60 seconds (s) — Minute to Second converter
• 1 min = 0.016667 hours (hr) — Minute to Hour converter
• 1 min = 0.00069444 days (d) — Minute to Day converter
• 1 min = 0.00009921 weeks (wk) — Minute to Week converter
• 1 min = 0.00002282 months (mo) — Minute to Month (average) converter
• 1 min = 0.0000019 years (yr) — Minute to Year (average) converter

Hour (hr)

The hour (3,600 seconds) divides the day into 24 parts, a convention inherited from ancient Egyptian astronomy.

• 1 hr = 3,600 seconds (s) — Hour to Second converter
• 1 hr = 60 minutes (min) — Hour to Minute converter
• 1 hr = 0.041667 days (d) — Hour to Day converter
• 1 hr = 0.005952 weeks (wk) — Hour to Week converter
• 1 hr = 0.001369 months (mo) — Hour to Month (average) converter
• 1 hr = 0.00011408 years (yr) — Hour to Year (average) converter

Day (d)

The civil day is exactly 86,400 seconds. Earth's actual rotation drifts slightly, which is why leap seconds occasionally exist.

• 1 d = 86,400 seconds (s) — Day to Second converter
• 1 d = 1,440 minutes (min) — Day to Minute converter
• 1 d = 24 hours (hr) — Day to Hour converter
• 1 d = 0.142857 weeks (wk) — Day to Week converter
• 1 d = 0.032854 months (mo) — Day to Month (average) converter
• 1 d = 0.002738 years (yr) — Day to Year (average) converter

Week (wk)

The seven-day week (604,800 seconds) is a purely cultural unit — it tracks no astronomical cycle, yet nearly every civilization adopted it.

• 1 wk = 604,800 seconds (s) — Week to Second converter
• 1 wk = 10,080 minutes (min) — Week to Minute converter
• 1 wk = 168 hours (hr) — Week to Hour converter
• 1 wk = 7 days (d) — Week to Day converter
• 1 wk = 0.229979 months (mo) — Week to Month (average) converter
• 1 wk = 0.019165 years (yr) — Week to Year (average) converter

Month (average) (mo)

The average calendar month is about 30.44 days (2,629,800 seconds) — a twelfth of the average Gregorian year, used for rates and rough planning.

• 1 mo = 2,629,800 seconds (s) — Month (average) to Second converter
• 1 mo = 43,830 minutes (min) — Month (average) to Minute converter
• 1 mo = 730.5 hours (hr) — Month (average) to Hour converter
• 1 mo = 30.4375 days (d) — Month (average) to Day converter
• 1 mo = 4.3482 weeks (wk) — Month (average) to Week converter
• 1 mo = 0.083333 years (yr) — Month (average) to Year (average) converter

Year (average) (yr)

The average Gregorian year is 365.25 days — 31,557,600 seconds — the figure used for ages, interest rates and astronomy's light-year.

• 1 yr = 31,557,600 seconds (s) — Year (average) to Second converter
• 1 yr = 525,960 minutes (min) — Year (average) to Minute converter
• 1 yr = 8,766 hours (hr) — Year (average) to Hour converter
• 1 yr = 365.25 days (d) — Year (average) to Day converter
• 1 yr = 52.1786 weeks (wk) — Year (average) to Week converter
• 1 yr = 12 months (mo) — Year (average) to Month (average) converter

Every conversion formula

The table below lists the exact formula for every time pair we support. All factors derive from the SI definitions of the units, so chaining them never introduces error.

One-line cross reference: every unit in every other unit

The complete pairwise reference — every supported time unit expressed in each of the others:

• 1 second = 0.016667 minutes
• 1 second = 0.00027778 hours
• 1 second = 0.00001157 days
• 1 second = 0.00000165 weeks
• 1 second = 0.00000038 months
• 1 second = 0.00000003 years
• 1 minute = 60 seconds
• 1 minute = 0.016667 hours
• 1 minute = 0.00069444 days
• 1 minute = 0.00009921 weeks
• 1 minute = 0.00002282 months
• 1 minute = 0.0000019 years
• 1 hour = 3,600 seconds
• 1 hour = 60 minutes
• 1 hour = 0.041667 days
• 1 hour = 0.005952 weeks
• 1 hour = 0.001369 months
• 1 hour = 0.00011408 years
• 1 day = 86,400 seconds
• 1 day = 1,440 minutes
• 1 day = 24 hours
• 1 day = 0.142857 weeks
• 1 day = 0.032854 months
• 1 day = 0.002738 years
• 1 week = 604,800 seconds
• 1 week = 10,080 minutes
• 1 week = 168 hours
• 1 week = 7 days
• 1 week = 0.229979 months
• 1 week = 0.019165 years
• 1 month (average) = 2,629,800 seconds
• 1 month (average) = 43,830 minutes
• 1 month (average) = 730.5 hours
• 1 month (average) = 30.4375 days
• 1 month (average) = 4.3482 weeks
• 1 month (average) = 0.083333 years
• 1 year (average) = 31,557,600 seconds
• 1 year (average) = 525,960 minutes
• 1 year (average) = 8,766 hours
• 1 year (average) = 365.25 days
• 1 year (average) = 52.1786 weeks
• 1 year (average) = 12 months

Real-world reference points

Time anchors worth knowing: a day is 86,400 seconds, a week 604,800, an average month 30.44 days, a year 8,766 hours or about 525,960 minutes, and a human life of 80 years spans roughly 2.5 billion seconds — a number that makes seconds feel suddenly precious.

Most-used conversion tables

Day to Second

Year (average) to Minute

Second to Minute

Minute to Second

Minute to Hour

Hour to Minute

Hour to Day

Day to Hour

Common mistakes to avoid

Time conversions stumble on calendar irregularity: months range from 28 to 31 days (so "a month" as 30 days is an approximation), a year is 365.25 days on average because of leap years, and financial calculations often use a 360-day "banker's year" — always check which convention your context expects.

Tips for accurate conversions

• Round once, at the end. Chaining conversions and rounding each step compounds error surprisingly fast.
• Watch for regional unit variants. Some unit names have US and imperial variants with different sizes — always check which one your source means.
• Estimate first, then compute. A rough mental figure catches order-of-magnitude mistakes before they end up in your work.
• Use exact factors for anything official. The factors in this guide are the internationally defined values, not approximations.

Frequently asked questions

Which time unit should I use?

Use the unit your audience expects: metric units for international and scientific audiences, US customary units for American everyday contexts. When in doubt, give both — "5 km (3.1 mi)" style.

Are these conversion factors exact?

Yes. Every factor on this page comes from the internationally agreed definition of the units involved (most were fixed by treaty in 1959 or by SI definition), so the only inaccuracy is the rounding you choose for the final answer.

Can I use these tables offline?

Yes — print this page or save it as a PDF. The tables are computed from exact factors and will not go out of date.