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

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