Convert Exa to Peta

Exa (E) to Peta (P) 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 E = 1000 P

1 Exa = 1000 Peta

1 Peta = 0.001 Exa

1 E in every supported prefix

Conversion chart: Exa to Peta

Conversion table

Exa (E)	Peta (P)
0.01 E	10 P
0.1 E	100 P
1 E	1000 P
2 E	2000 P
3 E	3000 P
5 E	5000 P
10 E	10000 P
20 E	20000 P
50 E	50000 P
100 E	100000 P
1000 E	1000000 P

Exa (E)

Definition: An SI prefix denoting a factor of 10¹⁸ — a quintillion times the base unit.

History: Adopted by the CGPM in 1975, at a time when the largest practical prefixes needed to keep pace with growing quantities in physics and, later, computing.

Current use: Common in describing large-scale computing performance (exaflops) and total global data storage and traffic figures (exabytes).

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.

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 Exa → Peta: multiply by 1000. For example, 1 E × 1000 = 1000 P.

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 E equals 1000 P. 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 Peta are in 1 Exa?

1 Exa (E) equals exactly 1000 Peta (P).

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 Exa to Other Prefixes

Possible Prefix Conversions

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