Convert Pico to Zepto

Pico (p) to Zepto (z) 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 z

1 Pico = 1E+09 Zepto

1 Zepto = 1E-09 Pico

1 p in every supported prefix

Conversion chart: Pico to Zepto

Conversion table

Pico (p)	Zepto (z)
0.01 p	10000000 z
0.1 p	1E+08 z
1 p	1E+09 z
2 p	2E+09 z
3 p	3E+09 z
5 p	5E+09 z
10 p	1E+10 z
20 p	2E+10 z
50 p	5E+10 z
100 p	1E+11 z
1000 p	1E+12 z

Pico (p)

Definition: An SI prefix denoting a factor of 10⁻¹² — one trillionth of the base unit.

History: Adopted by the CGPM in 1960 alongside nano-, extending the SI's small-scale prefixes as electronics and physics needed to describe ever-tinier quantities.

Current use: Common in electronics (picofarads for small capacitors) and in describing extremely short time intervals (picoseconds) in laser and telecommunications research.

Zepto (z)

Definition: An SI prefix denoting a factor of 10⁻²¹ — one sextillionth of the base unit.

History: Adopted by the CGPM in 1991 alongside zetta-, extending the small end of the SI prefix table to mirror the newly added large-scale prefixes.

Current use: Rarely used outside theoretical physics and chemistry contexts involving individual-molecule mass calculations.

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 Pico → Zepto: multiply by 1E+09. For example, 1 p × 1E+09 = 1E+09 z.

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 z. 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 Zepto are in 1 Pico?

1 Pico (p) equals exactly 1E+09 Zepto (z).

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 Pico to Other Prefixes

Possible Prefix Conversions

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