Explains the distinction between decimal prefixes such as MB and binary prefixes such as MiB.
Dedicated unit pair
Gigabits per second to Megabits per second
Convert Gb/s to Mb/s instantly, then review the formula, assumptions, and rounding guidance.
Data-transfer speedInstant result
Decimals
Formula result = input × 1000000000 ÷ 1000000. 1 Gb/s = 1,000 Mb/s
Common examples
One value, several units
Bits per second1,000,000,000 bit/s
Kilobits per second1,000,000 kb/s
Megabits per second1,000 Mb/s
Kilobytes per second125,000 kB/s
Megabytes per second125 MB/s
Conversion table
| Gb/s | Mb/s |
|---|---|
| 1 Gb/s | 1,000 Mb/s |
| 2 Gb/s | 2,000 Mb/s |
| 5 Gb/s | 5,000 Mb/s |
| 10 Gb/s | 10,000 Mb/s |
| 25 Gb/s | 25,000 Mb/s |
| 50 Gb/s | 50,000 Mb/s |
| 100 Gb/s | 100,000 Mb/s |
Conversion chart
1 Gb/s1,000 Mb/s
5 Gb/s5,000 Mb/s
10 Gb/s10,000 Mb/s
25 Gb/s25,000 Mb/s
50 Gb/s50,000 Mb/s
Worked example
100 Mb/s equals 12.5 MB/s.
Unit definition
Gigabits per second (Gb/s) One gigabits per second equals 1,000,000,000 bit per second.
Unit history
Gigabits per second is represented here using its modern SI definition or an internationally accepted relationship to an SI base unit.
Step by step
1. Parse the value, including fractions.
2. Convert Gb/s to bit per second.
3. Convert the base value to Mb/s and apply your display precision.
Understand the result before using it
Gigabits per second to Megabits per second converts a value measured in Gigabits per second (Gb/s) into the equivalent value in Megabits per second (Mb/s). The numerical value changes because the size and definition of the selected unit changes; the underlying quantity does not.
Calculated result
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.
Formula, assumptions, and example
Formula
result = input × 1000000000 ÷ 1000000
Assumptions
- Gigabits per second and Megabits per second represent the same data-transfer speed quantity.
- The input is expressed in Gb/s; the output is expressed in Mb/s.
- The unit definitions and conventional relationship shown on this page apply.
Worked example
1 Gb/s = 1,000 Mb/s. For another value, apply the same relationship and round only to the precision your source measurement supports.
When to use it
Good uses
- Read a Gb/s measurement in a document that expects Mb/s.
- Compare a gigabits per second value with a value reported in megabits per second.
- Check the Gb/s-to-Mb/s arithmetic before copying the result into another calculation.
Limitations
Common mistakes to avoid
- A byte contains eight bits; advertised network speed does not guarantee the same application download rate.
- Round the output to a precision justified by the original measurement.
- Verify safety-critical, regulated, laboratory, and contractual conversions against the controlling standard.
Sources and further reading
These references explain the underlying standards or provide authoritative context. Your own contract, institution, clinician, product documentation, local code, or governing standard may be the controlling source.
Guidance on unit names, symbols, conversions, and numerical presentation.
Questions about this calculation
How do I convert Gigabits per second to Megabits per second?
result = input × 1000000000 ÷ 1000000 Using the displayed relationship, 1 Gb/s equals 1,000 Mb/s.
How many Megabits per second are in one Gigabits per second?
One Gigabits per second is 1,000 Megabits per second. The displayed digits may be rounded.
Can I reverse the Gb/s to Mb/s conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts Mb/s back to Gb/s.
Is the Gigabits per second to Megabits per second result exact?
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.