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Convert Atto to Pico

Atto (a) to Pico (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.

The numeric value you want to convert. Decimals are accepted.

Result

1 a = 1E-06 p

1 Atto = 1E-06 Pico

1 Pico = 1000000 Atto

1 a in every supported prefix

Conversion chart: Atto to Pico

Conversion table

Atto (a) Pico (p)
0.01 a 1E-08 p
0.1 a 1E-07 p
1 a 1E-06 p
2 a 2E-06 p
3 a 3E-06 p
5 a 5E-06 p
10 a 1E-05 p
20 a 2E-05 p
50 a 5E-05 p
100 a 0.0001 p
1000 a 0.001 p

Atto (a)

Definition: An SI prefix denoting a factor of 10⁻¹⁸ — one quintillionth of the base unit. From the Danish/Norwegian 'atten' (eighteen).

History: Adopted by the CGPM in 1964 alongside femto-, extending the SI down to the sub-atomic measurement scale.

Current use: Used in high-precision physics measurements, including attosecond-scale laser pulses used to study electron motion within atoms.

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.

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 Atto → Pico: multiply by 1E-06. For example, 1 a × 1E-06 = 1E-06 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 a equals 1E-06 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 Pico are in 1 Atto?

1 Atto (a) equals exactly 1E-06 Pico (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 Atto to Other Prefixes

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

Possible Prefix Conversions

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

See also