How do you convert giga to mega?

To convert giga (G) to mega (M), multiply the measurement in giga by 1,000 (mega = giga × 1,000).

What is 5 giga in mega?

5 giga (5 G) is equal to 5,000 mega (5,000 M).

Which is larger, 1 giga (g) (G) or 1 mega (m) (M)?

One giga (g) (G) is larger than one mega (m) (M). Specifically, 1 G contains 1,000 M, whereas 1 M is 0.001 G.

How do I convert back from mega (10⁶) (M) to giga (10⁹) (G)?

To reverse the calculation from M to G, multiply your mega (m) value by the inverse factor 0.001 (or divide by 1,000). You can also click the Swap button in the tool above to flip directions in one click.

How many decimal places should I round G to M results to?

For everyday comparisons and quick estimates, rounding to 2 decimal places is usually sufficient (for example, 5 G ≈ 5,000.00 M). For engineering, laboratory, or machining specifications, select 4 or 6 decimals—or Scientific (10ⁿ) mode—in the calculator toolbar above.

Giga to Mega Converter

Enter the prefix value in giga below to convert it to mega.

Mega (10⁶) to Giga (10⁹) (M → G)

Convert Giga (10⁹) to Mega (10⁶)

Enter a value in giga (10⁹) (G) to convert to mega (10⁶) (M).

Value (G)

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Result

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5,000mega (10⁶)

5 G = 5,000 M

Result updates automatically

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Suggested Conversions

Reference:NIST OWM (SI Units — Length)

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Giga to Mega Conversion Table

Table showing various giga measurements converted to mega. Click any preset value or arrow to load it into the converter.

Giga (10⁹) (G)	Mega (10⁶) (M)
1 G	1,000 M
2 G	2,000 M
2.5 G	2,500 M
5 G	5,000 M
10 G	10,000 M
15 G	15,000 M
20 G	20,000 M
25 G	25,000 M
30 G	30,000 M
50 G	50,000 M

How to Convert Giga to Mega

To convert giga to mega, multiply the prefix value by the following conversion ratio: 1,000 mega/giga.

Since one giga is equal to 1,000 mega, you can use this simple formula to convert:

mega = giga × 1,000

The prefix value in mega is equal to the prefix value in giga multiplied by 1,000.

For example, here's how to convert 5 giga to mega using the formula above.

mega = (5 G × 1,000) = 5,000 M

How Many Mega Are in a Giga?

There are 1,000 mega in a giga, which is why we use this value in the formula above.

1 G = 1,000 M|1 M = 0.001 G

Our giga to mega calculator automatically converts your prefix value measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.

Giga and mega are both units used to measure prefix value. Keep reading to learn more about each unit.

What Is a Giga?

A giga is a unit of prefix value equal to 1,000,000,000 base units (1), the base unit for prefix value. SI prefix for 10⁹ (billion). [1]

The giga is classified as an International System of Units (SI) unit of prefix value. Giga can be abbreviated as G; for example, 1 giga can be written as 1 G.

When working with giga (G) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.

In practice, giga (G) are widely used across large-scale industrial, bulk, and macro-level prefix value specifications within International System of Units (SI) workflows, engineering documentation, and technical data sheets.

Learn more about giga in our Prefixes Converter.

What Is a Mega?

A mega is a unit of prefix value equal to 1,000,000 base units (1), the base unit for prefix value. SI prefix for 10⁶ (million). [2]

The mega is classified as an International System of Units (SI) unit of prefix value. Mega can be abbreviated as M; for example, 1 mega can be written as 1 M.

When working with mega (M) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.

In practice, mega (M) are widely used across large-scale industrial, bulk, and macro-level prefix value specifications within International System of Units (SI) workflows, engineering documentation, and technical data sheets.

Learn more about mega in our Prefixes Converter.

When converting prefix value between giga (G) and mega (M), keep full floating-point precision (1 G = 1,000 M; 1 M = 0.001 G) during intermediate calculations and round only the final mega figure to match your instrument tolerance.

More Giga & Mega Conversions

Need to calculate in the opposite direction? Use our mega (10⁶) to giga (10⁹) calculator to switch your starting unit immediately. You can also explore related tools such as converting mega (10⁶) to giga (10⁹), converting base units (10⁰) to mega (10⁶), or converting giga (10⁹) to base units (10⁰).

Convert from Giga

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Frequently Asked Questions

There are 1,000 mega (M) in 1 giga (G). Conversely, 1 mega (M) is equal to 0.001 giga (G).

Prefixes Converter

Quick Info

Direct Factor: 1 giga (g) (G) equals 1,000 mega (10⁶) (M).
Inverse Factor: 1 mega (m) (M) equals 0.001 giga (10⁹) (G).
Formula: mega (10⁶) = giga (10⁹) × 1,000.
Verified Precision: Anchored to official NIST SP 811 and ISO/IEC 80000 standards.

Units Comparison

Giga (G) (G)

SI prefix for 10⁹ (billion).

Mega (M) (M)

SI prefix for 10⁶ (million).

Base Unit (No Prefix) (1)

Unprefixed SI base unit (10⁰ = 1).

References

[1]NIST OWM · SI Units — Length
Source
[2]BIPM · SI Base Unit: Metre (m)
Source
[3]NIST HB 133 · NIST Handbook 133 (2019 Ed.)
Source

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References

NIST · BIPM · ISO

[1]
NIST OWM (SI Units — Length)·Prefixes Metrology Standard — Giga (10⁹) (G) to Mega (10⁶) (M)
NIST OWM Standard
[2]
BIPM (SI Base Unit: Metre (m))·Unit Specifications: Giga (G) (G) & Mega (M) (M)
BIPM Specification
[3]
NIST HB 133 (NIST Handbook 133 (2019 Ed.))·Conversion Factors & Mathematical Basis (G to M)
NIST HB 133 Reference

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