# MB to GB Converter

URL: https://speedycalculator.com/calculators/conversion/mb-to-gb-converter/
Last updated: 2026-10-25

> Convert megabytes (MB) to gigabytes (GB): 1 megabyte = 0.001 GB, so multiply by 0.001 or divide by 1,000. Both fields are editable, so you can also type in gigabytes and get megabytes back.

## Inputs

- Megabytes (MB)

## Results

- Gigabytes

## Formula

```
1 MB = 0.001 GB
1 GB = 1,000 MB
GB = MB × 0.001
```

## Explanation

Divide megabytes by 1,000 for gigabytes (SI), or MiB by 1,024 for GiB (binary). Phone data plans and cloud storage normally use the decimal definition.

### How to use the MB to GB Converter

- Type the number of megabytes into the **Megabytes** field. Decimals such as 500 are fine.
- Read the answer in **Gigabytes** – it updates as you type, with no button to press.
- To convert the other way, type into **Gigabytes** and the megabytes are recalculated.
- Press **Copy results** to copy both values with the page title, or **Copy link** to share this exact conversion.

This page converts only MB ⇄ GB. Need a different unit? Use the general data size converter, where you can choose any “from” and “to” unit.

### How it works

Both units measure data size, so they are always in the same ratio: one megabyte equals 0.001 gigabytes. The calculator multiplies the number of megabytes you type by 0.001 to give gigabytes, and when you type into the gigabytes field it divides by the same factor to give megabytes. Because the ratio never changes, doubling the megabytes always doubles the gigabytes. Results are calculated at full precision and rounded only for display (up to eight decimal places, with very large or small values shown in scientific notation).

### How to convert megabytes to gigabytes

- Write down the value in megabytes, for example **1,000 MB**.
- Multiply by the conversion factor 0.001 (because 1 megabyte = 0.001 GB).
- 1,000 × 0.001 = **1 GB**.
- To go back from gigabytes to megabytes, divide by 0.001 – or multiply by 1,000.

### MB to GB conversion table

MegabytesGigabytesGigabytesMegabytes100 MB0.1 GB1 GB1,000 MB500 MB0.5 GB2 GB2,000 MB750 MB0.75 GB5 GB5,000 MB1,000 MB1 GB10 GB10,000 MB1,024 MB1.024 GB20 GB20,000 MB2,048 MB2.048 GB50 GB50,000 MB5,000 MB5 GB100 GB100,000 MB10,000 MB10 GB1,000 GB1,000,000 MB

### What is a megabyte?

A megabyte is 1,000,000 bytes (SI). A typical smartphone photo is 2–5 MB.

### What is a gigabyte?

A gigabyte is 1,000,000,000 bytes (SI). Phone storage and data plans are measured in GB.

### Common mistakes to avoid

Mixing decimal units (1 gb = 10⁹ bytes) with binary units (1 gib = 2³⁰ bytes), and bits with bytes.

## Worked example

Inputs — Megabytes: 1,000 MB.

Results — **Gigabytes = 1 GB**.

## FAQ

**How many MB in a GB?**
1,000 (decimal) or 1,024 MiB per GiB.

**How many GB is 5,000 MB?**
5 GB.

**How do I convert megabytes to gigabytes?**
Multiply the number of megabytes by 0.001. For example, 1,000 MB × 0.001 = 1 GB.

**How do I convert gigabytes back to megabytes?**
Divide by 0.001 (or multiply by 1,000), or simply type the value into the gigabytes field above.

**What is 100 MB in gigabytes?**
100 MB = 0.1 GB.

**Is this conversion exact?**
Yes. The factor comes from the official definitions of both units (NIST and the SI), so the only difference you may see is rounding in the last displayed digit.

**Can I convert to other units on this page?**
This page converts only between megabytes and gigabytes. To pick any data size unit, use the general data size converter linked under Related calculators.

**What formula does the MB to GB Converter use?**
1 MB = 0.001 GB.


## Sources

- [NIST Special Publication 811 – Guide for the Use of the International System of Units](https://www.nist.gov/pml/special-publication-811)
- [NIST Handbook 44 Appendix C – General tables of units of measurement](https://www.nist.gov/pml/owm/nist-handbook-44-current-edition)