Convert Yocto to Peta

Yocto (y) 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 y = 1E-39 P

1 Yocto = 1E-39 Peta

1 Peta = 1E+39 Yocto

1 y in every supported prefix

Conversion chart: Yocto to Peta

Conversion table

Yocto (y)	Peta (P)
0.01 y	1E-41 P
0.1 y	1E-40 P
1 y	1E-39 P
2 y	2E-39 P
3 y	3E-39 P
5 y	5E-39 P
10 y	1E-38 P
20 y	2E-38 P
50 y	5E-38 P
100 y	1E-37 P
1000 y	1E-36 P

Yocto (y)

Definition: An SI prefix denoting a factor of 10⁻²⁴ — one septillionth of the base unit, the smallest of the classical SI prefixes.

History: Adopted by the CGPM in 1991 alongside yotta-, giving the SI a matched pair of prefixes at the extreme large and small ends of the scale.

Current use: Used almost exclusively in physics and chemistry to express the mass of individual subatomic particles and atoms in SI-coherent units.

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 Yocto → Peta: multiply by 1E-39. For example, 1 y × 1E-39 = 1E-39 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 y equals 1E-39 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 Yocto?

1 Yocto (y) equals exactly 1E-39 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 Yocto to Other Prefixes

Possible Prefix Conversions

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