86,400
=1,440 minutes
=24 hours
=1 day
Use this page for quick answers, custom conversions, copyable results, and the next most common time calculations people ask after this one.
Time converter
How Many Seconds Are In A Day?
A standard day has 86,400 seconds. Convert any time value below and keep moving into the next useful tool.
Seconds in a Day Calculator
Start with a common example or enter your own number.
Convert from →
seconds / minutes / hours / days / weeks
Enter a value to convert it into seconds, minutes, hours, days, and weeks.
Seconds86,400
Minutes1,440
Hours24
Days1
Milliseconds86,400,000
Microseconds86,400,000,000
Nanoseconds86,400,000,000,000
Continue with the next time tools
Seconds in a year
Scale this answer up to a standard year and keep the same answer-first layout.
Open tool
Minutes in a week
Good next step for schedules, routines, and weekly planning calculations.
Open tool
Hours in a month
Useful for billing, staffing, and monthly planning estimates.
Open tool
Keep the user moving
Three natural next steps after the initial answer.
Need a custom value?
Use the calculator above for any number of seconds, minutes, hours, days, weeks, or years.
Jump back to calculatorNeed a bigger time unit?
Move straight into yearly, weekly, and monthly answer pages without losing context.
Browse time toolsNeed to share an answer?
Copy a full result string or generate a shareable query URL after any conversion.
See result actionsHow to Calculate Seconds in a Day
- Step 1 Start with 1 day = 24 hours.
- Step 2 Each hour has 60 minutes.
- Step 3 Each minute has 60 seconds, so 24 x 60 x 60 = 86,400.
Common Day to Seconds Conversions
| Days | Seconds | Minutes | Hours |
|---|---|---|---|
| 0.25 day | 21,600 seconds | 360 minutes | 6 hours |
| 0.5 day | 43,200 seconds | 720 minutes | 12 hours |
| 1 day | 86,400 seconds | 1,440 minutes | 24 hours |
| 2 days | 172,800 seconds | 2,880 minutes | 48 hours |
| 7 days | 604,800 seconds | 10,080 minutes | 168 hours |
| 30 days | 2,592,000 seconds | 43,200 minutes | 720 hours |
| 365 days | 31,536,000 seconds | 525,600 minutes | 8,760 hours |
For Developers
Use SECONDS_PER_DAY = 86400 for standard duration math, TTL values, cache expiry, and simple Unix time calculations.
For calendar logic, time zones, and daylight saving transitions, use a date-time library instead of adding fixed seconds to local dates.
Special Cases
Daylight saving time
A local calendar day can appear to have 23 or 25 hours during DST changes, but standard unit conversion uses 86,400 seconds.
Leap seconds
UTC can include leap seconds. For everyday time conversion, 1 day is still treated as 86,400 seconds.
Months and years
Months vary from 28 to 31 days. A standard non-leap year has 365 days, or 31,536,000 seconds.
FAQ
How many seconds are in a day?
There are 86,400 seconds in a standard 24-hour day.
What is the formula for seconds in a day?
Multiply 24 hours by 60 minutes by 60 seconds: 24 x 60 x 60 = 86,400.
How many minutes are in a day?
There are 1,440 minutes in a day.
Is a day always 86,400 seconds?
For standard time conversion, yes. Astronomical days and local daylight saving calendar days can vary.
How many seconds are in half a day?
Half a day is 43,200 seconds.
How many seconds are in a week?
A 7-day week has 604,800 seconds.
Why do programmers use 86400?
It is the standard number of seconds in a 24-hour day for timers, TTLs, and duration math.
Formula: 1 day = 24 hours x 60 minutes x 60 seconds = 86,400 seconds.