How Many Seconds Are in a Day?
There are exactly 86,400 seconds in 1 day — that is 24 hours × 60 minutes × 60 seconds. Use this days to seconds converter and calculator to turn any number of days into seconds, whether that is 1 day, 2 days, 7 days, 30 days, or 365 days. Enter a value below and the result appears instantly.
Days to seconds converter — seconds in a day calculator
Quick Answer
There Are 86,400 Seconds in a Day
Whether you search for "how many seconds in a day," "how many seconds are there in a day," or "seconds in a day," the answer is always the same fixed number: 86,400 seconds. This number never changes because 1 day is always defined as 24 hours, and 24 hours always contains 86,400 seconds.
Quick Reference
Days to Seconds Conversion Table
Use this days to seconds conversion table for quick answers, including how many seconds are in a day, 2 days, 7 days, 30 days, and 365 days.
| Days | Calculation | Seconds |
|---|---|---|
| 1 day | 1 × 86,400 | 86,400 seconds |
| 2 days | 2 × 86,400 | 172,800 seconds |
| 2.5 days | 2.5 × 86,400 | 216,000 seconds |
| 3 days | 3 × 86,400 | 259,200 seconds |
| 4 days | 4 × 86,400 | 345,600 seconds |
| 5 days | 5 × 86,400 | 432,000 seconds |
| 6 days | 6 × 86,400 | 518,400 seconds |
| 7 days | 7 × 86,400 | 604,800 seconds |
| 10 days | 10 × 86,400 | 864,000 seconds |
| 11 days | 11 × 86,400 | 950,400 seconds |
| 12 days | 12 × 86,400 | 1,036,800 seconds |
| 14 days | 14 × 86,400 | 1,209,600 seconds |
| 27.3 days | 27.3 × 86,400 | 2,358,720 seconds |
| 30 days | 30 × 86,400 | 2,592,000 seconds |
| 31 days | 31 × 86,400 | 2,678,400 seconds |
| 90 days | 90 × 86,400 | 7,776,000 seconds |
| 191 days | 191 × 86,400 | 16,502,400 seconds |
| 365 days | 365 × 86,400 | 31,536,000 seconds |
Step by Step
How to Convert Days to Seconds
Converting days to seconds is simple. Since 1 day equals 86,400 seconds, you only need to multiply the number of days by 86,400.
The Formula
The rule is simple: 1 day equals 24 hours, and each hour has 3,600 seconds. That means 1 day equals exactly 86,400 seconds — the answer to "how many seconds in a day."
To convert seconds back to days, divide the number of seconds by 86,400.
How to Convert Days into Seconds
Start with the number of days
Write down the number of days you want to convert. For example, use 2 if you want to know how many seconds are in 2 days.
Multiply by 86,400
Multiply your day value by 86,400. For 2 days, the calculation is 2 × 86,400 = 172,800.
Add the unit
Write the answer in seconds. So 2 days equals 172,800 seconds.
Days vs Seconds
Understanding Days and Seconds
A day and a second both measure time, but they are used in different ways. Days are useful for schedules, deadlines, travel plans, and longer periods. Seconds are useful for timers, technical calculations, apps, scripts, and precise tracking.
If someone asks how many seconds are in a day, or how many seconds there are in one day, the answer is always 86,400. That number comes from 24 hours × 60 minutes × 60 seconds.
Once you know that, any days to seconds conversion becomes easy: multiply the number of days by 86,400. And if you already have a number of seconds and want to know the days, you can convert seconds to days using the reverse calculator.
Sample Time Calculations
Worked Examples
Here are clear examples for common searches, including how many seconds are in a day, 1 day to seconds, 3 days to seconds, 30 days to seconds, and other popular day-to-second conversions.
How many seconds are in a day?
There are 86,400 seconds in 1 day.
1 day to seconds
1 day equals 86,400 seconds.
2 days to seconds
2 × 86,400 = 172,800 seconds.
3 days to seconds
3 × 86,400 = 259,200 seconds.
4 days to seconds
4 × 86,400 = 345,600 seconds.
5 days to seconds
5 × 86,400 = 432,000 seconds.
7 days to seconds
7 × 86,400 = 604,800 seconds. That is the number of seconds in one full week.
14 days to seconds
14 × 86,400 = 1,209,600 seconds.
30 days to seconds
30 × 86,400 = 2,592,000 seconds. This is useful for 30-day periods, but not every calendar month has 30 days.
31 days to seconds
31 × 86,400 = 2,678,400 seconds.
90 days to seconds
90 × 86,400 = 7,776,000 seconds.
191 days to seconds
191 × 86,400 = 16,502,400 seconds.
365 days to seconds
365 × 86,400 = 31,536,000 seconds in a common year.
More Time Conversions
Need to Convert Other Time Units?
This page answers how many seconds are in a day and converts days to seconds, but you may also want to go the other way and convert seconds to days, or convert years to months, weeks, hours, and minutes. Browse the related time tools below.
FAQ
Frequently Asked Questions
Everything you need to know about how many seconds are in a day and converting days to seconds.