How Many Seconds Are There In A Day?

• Home
• About Us
• Convert Area Length Temperature Time Volume Weight
• Contact Us

You are: Home > Time > Days to Seconds How many Seconds are there in a Day? What is 1d in s? Convert 1 Day (1d) to Seconds (s) and show formula, brief history on the units and quick maths for the conversion.

Enter Days to convert to Seconds

Result Reset Form Swap Units (s → d) 1d in Hours (hr) 1d in Minutes (min) 1d in Months (mo) 1d in Sidereal Days (d-sr) 1d in Sidereal Hours (hr-sr) 1d in Sidereal Minutes (min-sr) 1d in Sidereal Seconds (s-sr) 1d in Sidereal Years (a-sr) 1d in Tropical Years (at) 1d in Years (a)

Quick Reference for Converting Days to Seconds

Formula s = d x 86400 Quick Rough Maths To get the Seconds, multiply the number of Days by 86.4 thousand Days (d) in 1 Second There are 0 Days in 1 Second Seconds (s) in 1 Day There are 86400 Seconds in 1 Day

Unit Information

Day /deɪ/ Symbol: d Unit System: SI

What is the Day?

The day is a unit of time and is an SI-derived unit with the symbol d.

On Earth, it is defined as 86,400 seconds and is approximately the time it takes for the earth to complete a full rotation around its axis. In the earlier days, this was measured by waiting for a cast shadow to match a template drawn from the previous day's shadow.

There are 365 days in a year and, on average, 30.42 days in a month.

The unit day has many different variants; depending on what is used to measure the Earth's rotation. In a sidereal day (a rotation with respect to a distant star or constellation, not the sun), there is actually 4 minutes less than 24 hours in a cycle.

Second /ˈsɛk(ə)nd/ Symbol: s Unit System: SI

What is the Second?

The second is the SI base unit for time and has the symbol s.

The second is commonly understood to be 1/86400 of a day; there are 60 seconds in a minute, 60 minutes in an hour and 24 hours in a day.

Analog and digital watches and clocks almost all measure and display the progression of time via the use of a second counter / hand - and is generally considered the lowest denomination of time.

The earliest display and use of seconds was in the last half of the 16th century. Prior to this, it was not considered accurate enough to measure in seconds as a mechanical device was needed to ensure consistency.

In 1656, a Dutch scientist invented the first pendulum clock that measured seconds. His name was Christiaan Huygens.

Conversion Tables for Days (d) to Seconds (s)

0d - 24d0d = 0s1d = 86400s2d = 172800s3d = 259200s4d = 345600s5d = 432000s6d = 518400s7d = 604800s8d = 691200s9d = 777600s10d = 864000s11d = 950400s12d = 1036800s13d = 1123200s14d = 1209600s15d = 1296000s16d = 1382400s17d = 1468800s18d = 1555200s19d = 1641600s20d = 1728000s21d = 1814400s22d = 1900800s23d = 1987200s24d = 2073600s 25d - 49d25d = 2160000s26d = 2246400s27d = 2332800s28d = 2419200s29d = 2505600s30d = 2592000s31d = 2678400s32d = 2764800s33d = 2851200s34d = 2937600s35d = 3024000s36d = 3110400s37d = 3196800s38d = 3283200s39d = 3369600s40d = 3456000s41d = 3542400s42d = 3628800s43d = 3715200s44d = 3801600s45d = 3888000s46d = 3974400s47d = 4060800s48d = 4147200s49d = 4233600s 50d - 74d50d = 4320000s51d = 4406400s52d = 4492800s53d = 4579200s54d = 4665600s55d = 4752000s56d = 4838400s57d = 4924800s58d = 5011200s59d = 5097600s60d = 5184000s61d = 5270400s62d = 5356800s63d = 5443200s64d = 5529600s65d = 5616000s66d = 5702400s67d = 5788800s68d = 5875200s69d = 5961600s70d = 6048000s71d = 6134400s72d = 6220800s73d = 6307200s74d = 6393600s 75d - 99d75d = 6480000s76d = 6566400s77d = 6652800s78d = 6739200s79d = 6825600s80d = 6912000s81d = 6998400s82d = 7084800s83d = 7171200s84d = 7257600s85d = 7344000s86d = 7430400s87d = 7516800s88d = 7603200s89d = 7689600s90d = 7776000s91d = 7862400s92d = 7948800s93d = 8035200s94d = 8121600s95d = 8208000s96d = 8294400s97d = 8380800s98d = 8467200s99d = 8553600s