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

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