How do you convert mega to giga?

To convert mega (M) to giga (G), multiply the measurement in mega by 0.001 (giga = mega × 0.001).

What is 5 mega in giga?

5 mega (5 M) is equal to 0.005 giga (0.005 G).

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

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

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

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

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

For everyday comparisons and quick estimates, rounding to 2 decimal places is usually sufficient (for example, 5 M ≈ 0.01 G). For engineering, laboratory, or machining specifications, select 4 or 6 decimals—or Scientific (10ⁿ) mode—in the calculator toolbar above.

Mega to Giga Converter

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

Giga (10⁹) to Mega (10⁶) (G → M)

Convert Mega (10⁶) to Giga (10⁹)

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

Value (M)

From

Result

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0.005giga (10⁹)

5 M = 0.005 G

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Suggested Conversions

Reference:NIST OWM (SI Units — Length)

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Mega to Giga Conversion Table

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

Mega (10⁶) (M)	Giga (10⁹) (G)
1 M	0.001 G
2 M	0.002 G
2.5 M	0.0025 G
5 M	0.005 G
10 M	0.01 G
15 M	0.015 G
20 M	0.02 G
25 M	0.025 G
30 M	0.03 G
50 M	0.05 G

How to Convert Mega to Giga

To convert mega to giga, multiply the prefix value by the following conversion ratio: 0.001 giga/mega.

Since one mega is equal to 0.001 giga, you can use this simple formula to convert:

giga = mega × 0.001

The prefix value in giga is equal to the prefix value in mega multiplied by 0.001.

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

giga = (5 M × 0.001) = 0.005 G

How Many Giga Are in a Mega?

There are 0.001 giga in a mega, which is why we use this value in the formula above.

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

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

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

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). [1]

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.

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). [2]

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.

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

More Mega & Giga Conversions

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

Convert from Mega

Convert to Giga

Frequently Asked Questions

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

Prefixes Converter

Quick Info

Direct Factor: 1 mega (m) (M) equals 0.001 giga (10⁹) (G).
Inverse Factor: 1 giga (g) (G) equals 1,000 mega (10⁶) (M).
Formula: giga (10⁹) = mega (10⁶) ÷ 1000.
Verified Precision: Anchored to official NIST SP 811 and ISO/IEC 80000 standards.

Units Comparison

Mega (M) (M)

SI prefix for 10⁶ (million).

Giga (G) (G)

SI prefix for 10⁹ (billion).

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

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