Convert Peta to Mega

Peta (P) to Mega (M) SI prefix conversion — enter any value below to get an instant result, or use the table for common values.

Results from this calculator are estimates provided for general informational purposes only, based on formulas, rates, and standards commonly accepted as of 2026. Figures may differ slightly from other calculators or professional sources due to rounding methods, differing assumptions, or regional regulations, and rules may change over time. Always consult a qualified professional — such as a financial advisor, healthcare provider, or other relevant specialist — before making decisions based on these results.

Value

From

Result

1 P = 1E+09 M

1 Peta = 1E+09 Mega

1 Mega = 1E-09 Peta

1 P in every supported prefix

Conversion chart: Peta to Mega

Conversion table

Peta (P)	Mega (M)
0.01 P	10000000 M
0.1 P	1E+08 M
1 P	1E+09 M
2 P	2E+09 M
3 P	3E+09 M
5 P	5E+09 M
10 P	1E+10 M
20 P	2E+10 M
50 P	5E+10 M
100 P	1E+11 M
1000 P	1E+12 M

Peta (P)

Definition: An SI prefix denoting a factor of 10¹⁵ — a quadrillion times the base unit.

History: Adopted by the CGPM in 1975 as part of the same extension that introduced exa-, tera having already proven insufficient for emerging large-scale scientific quantities.

Current use: Widely used in computing (petabytes of storage, petaflops of processing power) and in physics for large energy and frequency quantities.

Mega (M)

Definition: An SI prefix denoting a factor of 10⁶ — a million times the base unit.

History: One of the original prefixes adopted when the metric system's prefix table was formalized in the 19th century, later folded into the modern SI in 1960.

Current use: Extremely common in everyday and technical use — megabytes of file size, megahertz of radio frequency, and megawatts of power output.

Supported Units

Prefix	Symbol	Multiplier (× base)
Yotta	Y	1E+24
Zetta	Z	1E+21
Exa	E	1E+18
Peta	P	1E+15
Tera	T	1E+12
Giga	G	1E+09
Mega	M	1000000
Kilo	k	1000
Hecto	h	100
Deka	da	10
None (base unit)	—	1
Deci	d	0.1
Centi	c	0.01
Milli	m	0.001
Micro	µ	1E-06
Nano	n	1E-09
Pico	p	1E-12
Femto	f	1E-15
Atto	a	1E-18
Zepto	z	1E-21
Yocto	y	1E-24

About These Parameters

Value: The number of "From" prefix units you want to re-express in the "To" prefix. Since prefixes are just multiplier scales, this value can represent anything from a physical quantity's leading digits to a plain abstract number.
From Unit: The SI prefix your value is currently scaled by — for example, the "kilo" in "kilogram" or the "nano" in "nanosecond," entered here without the base unit attached.
To Unit: The SI prefix you want the value re-expressed in. Use the swap button to flip From and To instantly, handy when converting a datasheet figure from one prefix scale to another.

How Prefix Conversion Works

The Formula

Every SI prefix is defined by a fixed power-of-ten multiplier relative to the unprefixed base value. To convert a value from one prefix scale to another:

result = value × (multiplier of "From" prefix ÷ multiplier of "To" prefix)

For Peta → Mega: multiply by 1E+09. For example, 1 P × 1E+09 = 1E+09 M.

A History of Powers of Ten

The original six metric prefixes — kilo, hecto, deka, deci, centi, milli — were adopted by the French Academy of Sciences in 1795 alongside the metric system itself. As science and industry needed to describe ever-larger and ever-smaller quantities, the CGPM (Conférence Générale des Poids et Mesures) extended the table repeatedly: mega and micro in 1960 when the modern SI was formalized, giga and nano the same year, tera and pico following soon after, then peta/femto (1975), exa/atto (1975), and finally zetta/zepto and yotta/yocto in 1991 — the classical range covered on this page. In 2022 the CGPM went further still, adding ronna/ronto and quetta/quecto to keep pace with data-storage and astrophysical quantities that had begun to outgrow even yotta.

Why a Prefix-Only Converter Is Useful

Every other unit converter on this site attaches these same prefixes to one specific base unit — grams, watts, bytes, farads — because that's how the prefix is actually used in practice. But the underlying math of "how much bigger is giga than mega" never changes no matter which unit it's modifying, so it's often faster to reason about the prefix scale on its own: quickly checking that a "giga" figure is a billion and not a million, or converting a "nano" measurement from one datasheet into the "micro" scale used by a different one, without needing to know or care what physical quantity either figure describes.

Example

1 P equals 1E+09 M. Whatever base unit these prefixes are actually attached to — grams, bytes, watts, seconds — the same multiplier ratio applies: 1 kilo- is always 1,000 times 1 (unprefixed), and 1 mega- is always 1,000 times 1 kilo-, regardless of the quantity being measured.

Frequently Asked Questions

How many Mega are in 1 Peta?

1 Peta (P) equals exactly 1E+09 Mega (M).

Is giga a billion or a million?

Giga is always a billion (10⁹) times the base unit — a common point of confusion is with "mega," which is a million (10⁶). The two are frequently mixed up in casual conversation about data storage and computing speed, which is exactly the kind of mistake this converter is designed to catch.

Does this converter work for any unit, like grams or bytes?

Yes — this converter deliberately ignores the underlying unit and works purely with the multiplier scale. "1 kilo- to mega-" gives the same ratio (0.001) whether you mentally attach it to grams, watts, bytes, or any other quantity, because the prefix's multiplier is independent of what it's modifying.

What does "None (base unit)" mean in the unit list?

"None (base unit)" represents a value with no prefix attached at all — a plain gram, meter, or watt rather than a kilogram, kilometer, or milliwatt. It's included so you can convert directly between an unprefixed value and any prefixed scale, such as figuring out how many kilo- units equal one plain (unprefixed) unit.

Are ronna, ronto, quetta, and quecto included here?

Not yet — this page covers the classical SI prefix range from yotta (10²⁴) down to yocto (10⁻²⁴), which was complete from 1991 until 2022. The newer 2022 additions (ronna/ronna-, quetta/quecto) sit beyond even yotta and yocto and aren't included in this table.

Convert Peta to Other Prefixes

Possible Prefix Conversions

Tera to Yocto Exa to Yotta Hecto to Tera Zetta to Kilo Yocto to Nano Hecto to Milli Giga to Yocto Pico to Hecto Yocto to Micro Nano to Milli Deka to Kilo Femto to Giga Femto to Exa Giga to Milli Exa to Peta Nano to Yocto Yotta to Pico Centi to Deka Deka to Yotta Deci to Milli Deci to Femto Yotta to Micro Hecto to Pico Tera to Nano Centi to Deci Kilo to Yotta Femto to Nano Micro to Pico Atto to Zetta Femto to Deka Deka to Nano Atto to Yocto None (base unit) to Pico Centi to Giga Giga to Yotta Femto to Centi Mega to Centi Deka to Micro Deka to Pico Nano to None (base unit) Nano to Pico Milli to Nano Deci to Peta Hecto to Exa Yocto to Milli Zetta to Micro Zetta to Hecto Femto to Micro Milli to Hecto None (base unit) to Tera Exa to Deka Milli to Exa Nano to Atto Giga to Pico Deka to Peta Deka to Milli None (base unit) to Deci Peta to Deci Zepto to Yocto None (base unit) to Hecto Tera to Giga Deka to Yocto Giga to Femto Peta to Exa Deka to Femto Yocto to Centi Zepto to Pico Deci to Tera Tera to Deka Atto to Deci Zetta to Pico Atto to Pico Zepto to Giga Kilo to Zepto Kilo to Tera Mega to Femto Femto to Kilo Kilo to Femto Kilo to Exa Mega to Pico Peta to Milli Yocto to Deci Micro to Centi None (base unit) to Nano Peta to Nano None (base unit) to Peta None (base unit) to Femto Femto to Pico Zepto to Mega Exa to Zepto Exa to None (base unit) Zetta to Peta Yocto to Deka Nano to Hecto Hecto to Atto Tera to Exa Micro to Zetta Atto to Milli Femto to Deci Tera to Femto Peta to Yotta Centi to Yotta Tera to Milli Kilo to Nano Exa to Hecto Mega to Kilo Kilo to Milli Micro to Giga Giga to Peta Atto to Hecto Yocto to Atto Exa to Micro Centi to Yocto Deci to Kilo Pico to Kilo Mega to Hecto Tera to Deci Milli to Mega Mega to Nano Mega to Yocto Mega to None (base unit) Exa to Mega Deci to Centi Kilo to Deka Atto to Centi Micro to Mega Yotta to Mega Atto to Zepto Deka to Deci Yotta to Nano Kilo to Giga Milli to Yotta Yotta to Centi Exa to Pico Femto to Hecto Giga to Kilo Yocto to Mega Kilo to Hecto Femto to Peta Nano to Micro Yotta to Hecto Yocto to Yotta Exa to Atto Micro to None (base unit) Nano to Giga Hecto to Micro Femto to Tera Milli to Zetta Milli to Deka Peta to Yocto Tera to Mega Atto to Mega Hecto to Kilo Deci to Yocto Femto to Milli Atto to Peta Femto to Zepto Micro to Femto Deci to Nano Pico to Atto Kilo to Micro Centi to Peta Zepto to Centi Atto to Yotta Kilo to Atto Zepto to Kilo Pico to Yotta Milli to Giga Nano to Yotta Deka to Atto Micro to Kilo Pico to Exa Pico to Centi Milli to Yocto Exa to Nano Zepto to Hecto Hecto to Peta Giga to Hecto Yocto to Pico Mega to Exa Micro to Atto Nano to Centi Exa to Giga Tera to Micro Yotta to Peta Giga to Deci Kilo to Peta Giga to Atto Peta to Tera Pico to Zetta Micro to Yotta Mega to Deci Zepto to Peta Zetta to Yotta Zetta to Nano Zetta to Milli Femto to Yocto Tera to Peta None (base unit) to Exa Deka to Mega None (base unit) to Mega Micro to Milli Deci to Zepto Centi to Mega Yocto to Hecto Nano to Mega Mega to Giga Giga to Nano Deka to Tera Milli to None (base unit) Kilo to None (base unit) Nano to Deci Micro to Nano Yocto to Giga None (base unit) to Centi Kilo to Yocto Giga to Mega Zetta to Exa Yocto to Femto Giga to Tera Deci to Hecto Tera to Hecto Peta to Hecto Atto to Kilo Zetta to Tera Micro to Tera Yotta to Atto Zetta to Deci Zetta to Centi Yotta to Tera Milli to Micro Zepto to Nano Hecto to Deci Zetta to Mega Micro to Zepto None (base unit) to Micro Tera to None (base unit) Tera to Zepto Micro to Hecto Pico to Deci Milli to Tera Atto to Giga Centi to Milli Centi to Atto Kilo to Deci Yocto to Zetta Pico to Nano Nano to Exa Zetta to None (base unit) Hecto to Centi Peta to Micro Centi to Zepto Giga to None (base unit) Yotta to Zepto Yotta to Yocto Exa to Tera Deka to Centi Deci to Exa Tera to Atto Zetta to Giga Deka to Zepto Femto to Yotta Giga to Deka Hecto to Zepto Yotta to Deka Zepto to Zetta Zepto to Micro Atto to Tera Mega to Micro Pico to Femto Tera to Zetta Exa to Milli Deci to Atto Exa to Deci Zepto to Deci Mega to Peta Atto to Micro Deka to Zetta Hecto to Deka Atto to Deka Peta to Deka Giga to Centi Peta to Femto Tera to Yotta Mega to Zetta Tera to Kilo None (base unit) to Giga Mega to Yotta Deka to Giga Yocto to Zepto Pico to None (base unit) Yotta to Zetta Peta to Centi Mega to Atto Hecto to Zetta Tera to Centi Milli to Zepto Yocto to Kilo Milli to Femto Femto to Zetta Micro to Peta Pico to Deka Centi to Nano Centi to Pico Exa to Yocto Pico to Zepto Milli to Pico Peta to None (base unit) Yocto to Tera Deka to Hecto Centi to Exa Zetta to Yocto Nano to Tera Hecto to Nano Atto to Femto Milli to Kilo Mega to Milli Hecto to Yocto Zepto to Femto Micro to Yocto Kilo to Mega Deci to Pico None (base unit) to Deka Nano to Kilo Atto to Exa Yocto to None (base unit) Zetta to Atto Centi to Femto Nano to Deka Zepto to Deka Yotta to Giga Hecto to Yotta Exa to Kilo Peta to Giga Yotta to Milli Centi to Zetta Deka to None (base unit) Deci to Deka Kilo to Pico Nano to Femto Zepto to Exa Peta to Pico Atto to Nano Nano to Zepto Exa to Femto Hecto to Mega Yotta to Deci Mega to Zepto Exa to Zetta Giga to Zetta Giga to Exa Zetta to Femto Milli to Deci Deci to Yotta Deci to None (base unit) Zepto to Milli Deci to Mega Peta to Kilo Giga to Zepto Pico to Giga Micro to Exa Peta to Zetta Micro to Deka Yotta to None (base unit) Milli to Centi Zetta to Deka Pico to Milli Yotta to Exa Deka to Exa Hecto to Femto Zepto to Atto Giga to Micro Centi to Micro Exa to Centi Mega to Tera Milli to Atto Yotta to Femto Atto to None (base unit) Nano to Peta Centi to Hecto None (base unit) to Atto Peta to Mega Pico to Yocto Pico to Mega Milli to Peta Pico to Micro Micro to Deci None (base unit) to Milli Hecto to None (base unit) Tera to Pico Femto to Mega Peta to Zepto Deci to Giga None (base unit) to Yocto Zepto to None (base unit) Yocto to Peta Deci to Micro Centi to Tera Nano to Zetta Zepto to Yotta None (base unit) to Kilo None (base unit) to Zetta Zetta to Zepto Kilo to Centi Mega to Deka Pico to Peta Centi to None (base unit) None (base unit) to Yotta Peta to Atto Centi to Kilo Pico to Tera Femto to None (base unit) Femto to Atto None (base unit) to Zepto Yotta to Kilo Zepto to Tera Deci to Zetta Hecto to Giga Yocto to Exa Kilo to Zetta