12 - Speed Calculation - Mbps vs MBps

Question 1

Bits measure ?

big or small - b ?

Answer 1

Speed - bits measure speed

Mbps = small b means bits

Question 2

Bytes measure ?

big or small - b ?

Answer 2

File size

MBps = big B - and is incorrectly & confusingly used when measuring download speed

Question 3

Bits - how many bits in

1 - Kilobit
1 - Megabit
1 - Gigabit

Answer 3

“Bits”
1 Kilobit = 1000 bits

1 Megabit = 1 million bits

1 Gigabit = 1 Billion bits

Question 4

Kilobit - how many Kilobits in

1 - Megabit
1 - Gigabit

Answer 4

1 Megabit has = 1000 kilobits (1000 kilobit is 1Million bits)

1 Gigabit has = 1000,000 Kilobits (1M Kilobit is 1Billion bits)

Question 5

how to calculate speed from file size ?

whats the 1st step ?

Answer 5

If the speed is explained/given in bytes we multiply by 8 to get bits per second speed.

(simplified, & spelled out below)

File size is in bytes to convert it into bits we have to multiply it by 8. Why ? = there is - 8 bits in a byte

Question 6

how to calculate speed from file size ?

e. g
- the file size is 10MB (megabytes)
- the line speed is 100Mbps (megabits)

Answer 6

First convert Bytes into bits using formula (Bytes x 8 =)

10 x 8 = 80 80bits, 10MB converted into bits

so if the speed is 100 megabits sent within 1 second,
Then it will send this file just under 1 second ( actual answer is 0.8 )

80 bits divided by 100(linespeed) = 0.8

( the line can send 100 megabits within 1 second, the file size is 10 MegaBytes which we converted into bits
((not megabit as you need thousand bit to make a kb & a million to make a Mb 80bits falls short of kb & Mb)).

That means 80 bits can be sent just below 1 second.)

Question 7

how to calculate speed from file size ?
Another example

5GB file size

Line speed 100Mbps

Answer 7

• Make 1.5Gb into megaByte (its still a file size) = 1500MB. This makes it easier to make into bits
• 1500 MB convert into bits - 1500 x 8 = 12000
• 12000 divided by line speed (which is 100) = 120 seconds (2 mins)

Question 8

Megabit - how many Megabit in

1 - Gigabit
10 - Gigabit
100 - Gigabit

Answer 8

1 Gigabit has = 1000 Megabit

10 Gigabit has = 10,000 Megabit

100 Gigabit has = 100,000 (one hundred thousand)

10 Mbps
100 Mbps

1000 Mbps = 1GB
2000 Mbps = 2GB

10,000 Mbps = 10GB
20,000 Mbps = 20GB

Question 9

File Size - Picturing file size and its ruler

• One Byte = One Character or letter
• Kilobyte = page
• Megabyte = Book
• Gigabyte = video

Answer 9

• One Byte = One Character or letter
• Kilobyte = 1000 (technically 1024)
• Megabyte = 1 Million
• Gigabyte = 1 Billion

Question 10

What is the Formula ?

If the File size is in GB - then ?

Answer 10

File-size ~ converted into Bits(by x 8) = Answer is Divided by Line speed = ( Final answer is given in seconds )

If file size is GB

• Multiply by 1000 to get Megabit ( to make it easier )
• Then do the usual by multiplying by 8 to make it into bits