Months (mo)
A month is roughly the length of the Moon's cycle of phases.
Convert months to any time unit
1 month = 30.436875 days
Quick facts
- Unit
- Month (plural: months)
- Symbol
- mo
- Measures
- Time / Duration
- System
- Everyday
- Equals
- 2,629,746 seconds
- Definition
- 1/12 of a mean Gregorian year: 30.436875 days.
1 month in other units
| Days | 30.436875 d |
| Hours | 730.485 h |
| Minutes | 43,829.1 min |
| Seconds | 2,629,746 s |
| Years | 0.08333333333 yr |
| Weeks | 4.348125 wk |
| Milliseconds | 2,629,746,000 ms |
| Centuries | 0.000833333333 c |
What is a month?
A month is roughly the length of the Moon's cycle of phases. Calendar months have 28 to 31 days, so this converter uses the average Gregorian month of 30.436875 days (about 4.35 weeks). For a specific 30-day month or the lunar month, see those units.
Where the month sits among time units
The month is number 54 of 101 on our scale of time units, ordered from smallest to largest.
What months are used for
- Rent, salaries and subscriptions
- Loan and mortgage terms
- Age of babies and children
Months in real life
- February has 28 days (29 in leap years)
- A lunar month averages 29.53 days
- A 30-year mortgage is 360 months
One month is about as long as a lunar month, or about 91 working days, or about 91 transatlantic flights, or about 17% of a school year.
Top month conversions
Common amounts of months
- 0.1 mo
- 0.2 mo
- 0.3 mo
- 0.4 mo
- 0.5 mo
- 0.6 mo
- 0.7 mo
- 0.8 mo
- 0.9 mo
- 1 mo
- 1.5 mo
- 2 mo
- 2.5 mo
- 3 mo
- 3.5 mo
- 4 mo
- 4.5 mo
- 5 mo
- 6 mo
- 7 mo
- 7.5 mo
- 8 mo
- 9 mo
- 10 mo
- 11 mo
- 12 mo
- 13 mo
- 14 mo
- 15 mo
- 16 mo
- 17 mo
- 18 mo
- 19 mo
- 20 mo
- 21 mo
- 22 mo
- 23 mo
- 24 mo
- 25 mo
- 26 mo
- 27 mo
- 28 mo
- 29 mo
- 30 mo
- 31 mo
- 32 mo
- 33 mo
- 34 mo
- 35 mo
- 36 mo
- 37 mo
- 38 mo
- 39 mo
- 40 mo
- 41 mo
- 42 mo
- 43 mo
- 44 mo
- 45 mo
- 46 mo
- 47 mo
- 48 mo
- 49 mo
- 50 mo
- 51 mo
- 52 mo
- 53 mo
- 54 mo
- 55 mo
- 56 mo
- 57 mo
- 58 mo
- 59 mo
- 60 mo
- 61 mo
- 62 mo
- 63 mo
- 64 mo
- 65 mo
- 66 mo
- 67 mo
- 68 mo
- 69 mo
- 70 mo
- 71 mo
- 72 mo
- 73 mo
- 74 mo
- 75 mo
- 76 mo
- 77 mo
- 78 mo
- 79 mo
- 80 mo
- 81 mo
- 82 mo
- 83 mo
- 84 mo
- 85 mo
- 86 mo
- 87 mo
- 88 mo
- 89 mo
- 90 mo
- 91 mo
- 92 mo
- 93 mo
- 94 mo
- 95 mo
- 96 mo
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- 100 mo
- 110 mo
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- 150 mo
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- 170 mo
- 180 mo
- 190 mo
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- 210 mo
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- 230 mo
- 240 mo
- 250 mo
- 260 mo
- 270 mo
- 280 mo
- 290 mo
- 300 mo
- 310 mo
- 320 mo
- 330 mo
- 340 mo
- 350 mo
- 360 mo
- 370 mo
- 380 mo
- 390 mo
- 400 mo
- 410 mo
- 420 mo
- 430 mo
- 440 mo
- 450 mo
- 460 mo
- 470 mo
- 480 mo
- 490 mo
- 500 mo
- 600 mo
- 700 mo
- 800 mo
- 900 mo
- 1,000 mo
- 1,200 mo
- 1,500 mo
- 2,000 mo
- 2,500 mo
- 3,000 mo
- 4,000 mo
- 5,000 mo
- 10,000 mo
Convert months to all 100 other units
Everyday
- mo to d
- mo to h
- mo to min
- mo to s
- mo to yr
- mo to wk
- mo to c
- mo to dec
- mo to ka
- mo to fn
- mo to Q
- mo to common year
- mo to leap year
- mo to semester
- mo to 30-day month
- mo to score (20 years)
Metric (SI)
- mo to ms
- mo to µs
- mo to ns
- mo to ps
- mo to fs
- mo to as
- mo to cs
- mo to ks
- mo to ds
- mo to Gs
- mo to Ms
- mo to zs
- mo to ys
- mo to Ts
Astronomical
- mo to a
- mo to sidereal day
- mo to synodic month
- mo to tropical year
- mo to Ma
- mo to sidereal year
- mo to Mars sol
- mo to galactic year
- mo to Ga
- mo to sidereal month
- mo to saros
- mo to Mars year
- mo to Metonic cycle
- mo to Platonic year
- mo to anomalistic year
- mo to draconic year
- mo to Jupiter day
- mo to Sothic cycle
- mo to Venus day
- mo to anomalistic month
- mo to draconic month
- mo to Callippic cycle
- mo to Gaussian year
- mo to Hipparchic cycle
- mo to Pluto year
- mo to sidereal second
- mo to tropical month
Scientific
Historical & cultural
- mo to generation
- mo to olympiad
- mo to baktun
- mo to decimal hour
- mo to 刻
- mo to 时辰
- mo to .beat
- mo to decimal minute
- mo to decimal second
- mo to ghati
- mo to jubilee
- mo to kalpa
- mo to lustrum
- mo to moment (medieval)
- mo to muhurta
- mo to yuga
- mo to cd
- mo to 更
- mo to helek
- mo to indiction
- mo to kalabtun
- mo to katun
- mo to kin (Maya)
- mo to mahayuga
- mo to manvantara
- mo to piktun
- mo to triennium
- mo to tun (Maya)
- mo to vighati
- mo to winal
Everyday comparisons
Convert to months
Frequently asked questions
What is a month?
A month is roughly the length of the Moon's cycle of phases.
How is the month defined?
1/12 of a mean Gregorian year: 30.436875 days.
How many days are in a month?
One month equals 30.436875 days.
How many hours are in a month?
One month equals 730.485 hours.
How many minutes are in a month?
One month equals 43,829.1 minutes.