Example 1
- 1
- from GB
- to MB
1000 MB
What is 1 GB in MB? 1000 MB. SI prefix 1000, not RAM.
Memory units
Type a value, from, and to. 1 GB gives 1000 MB. 1 GiB gives 1024 MiB. 1024 MiB gives 1 GiB. Prefixes, not a RAM reading.
SI 1000 and IEC 1024 prefixes. Not a RAM reading from the system. Payload bytes sit on JSON size.
Results
Enter data and click Calculate.
How it works
Memory units in this calculator multiply a value by a prefix. 1 GB to MB gives 1000 MB. 1 GiB to MiB gives 1024 MiB. 1024 MiB to GiB gives 1 GiB. SI goes by 1000. IEC goes by 1024. This is not a RAM reading.
Field mem-value is a number. Selects mem-from and mem-to pick the ends. 1 × 10^9 / 10^6 = 1000. 1 × 2^30 / 2^20 = 1024. The bytes checkbox stays off in the examples. Second unit mem-to-extra is not in these three cards.
1000 MB is not free from htop. 1024 MiB does not come from Task Manager. 1 GiB is not a DIMM. Mix GB with GiB and the result splits. The calculator does not read /proc/meminfo.
JSON size next door multiplies characters by bytes. Storage cost multiplies GB by a price. Here 1 GB stays 1000 MB, the prefix alone.
Type 1, from GB to MB, then Calculate. The result is 1000 MB. A comma in 1,5 works. Zero value leaves 0. This is not a memory probe.
1 GB gives 1000 MB. 1 GiB gives 1024 MiB. 1024 MiB gives 1 GiB. Another prefix pair at 1 changes the result.
Formula
result = value × bytes[from] / bytes[to]. SI 1000, IEC 1024. Prefixes, not a RAM reading.
How to use
- Type 1, from GB to MB.
- Click Calculate. The result is 1000 MB.
- 1 GiB to MiB gives 1024 MiB. 1024 MiB to GiB gives 1 GiB.
- Prefixes, not a RAM reading.
- JSON payload bytes sit on JSON size.
1 GB = 1000 MB
An SI or IEC prefix. 1 GB gives 1000 MB. 1 GiB gives 1024 MiB. This is not a RAM reading.
- Memory
- The mem-from and mem-to ends. 1 GB leaves 1000 MB. 1024 MiB leaves 1 GiB.
- units
- A prefix, not a DIMM. 1 GiB to MiB gives 1024 MiB. Not htop.
- GiB
- IEC 1024^3. 1 GiB is 1024 MiB. GB is 1000^3.
Examples
Example 2
- 1
- from GiB
- to MiB
1024 MiB
What is 1 GiB in MiB? 1024 MiB. IEC prefix 1024.
Example 3
- 1024
- from MiB
- to GiB
1 GiB
What is 1024 MiB in GiB? 1 GiB.
Related calculators
Common questions
What is 1 GB in MB?
1000 MB. SI, base 1000. Not a RAM reading.
What is 1 GiB in MiB?
1024 MiB. IEC, base 1024.
What is 1024 MiB in GiB?
1 GiB. The same IEC prefix the other way.
Does the calculator read RAM?
No. No /proc/meminfo and no Task Manager. Prefixes only.
How does GB differ from GiB?
GB is 1000^3. GiB is 1024^3. 1 GB and 1 GiB are two entries.
Does a comma in 1,5 work?
Yes. 1,5 GB to MB gives 1500 MB.
Why the bytes checkbox?
It adds a B line. The examples keep it off.
Where do I size a JSON payload?
On JSON size. Here the prefix stays.
Does zero count?
Yes as 0 in the target unit. A blank field is a number error.
Knowledge sources
The calculator counts bits, bytes or throughput from your numbers. Below are SI and bit definitions (NIST).
Page updated in 2026.