Convert Centi to Atto

Centi (c) to Atto (a) 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 c = 1E+16 a

1 Centi = 1E+16 Atto

1 Atto = 1E-16 Centi

1 c in every supported prefix

Conversion chart: Centi to Atto

Conversion table

Centi (c)	Atto (a)
0.01 c	1E+14 a
0.1 c	1E+15 a
1 c	1E+16 a
2 c	2E+16 a
3 c	3E+16 a
5 c	5E+16 a
10 c	1E+17 a
20 c	2E+17 a
50 c	5E+17 a
100 c	1E+18 a
1000 c	1E+19 a

Centi (c)

Definition: An SI prefix denoting a factor of 10⁻² — one hundredth of the base unit.

History: One of the original six metric prefixes adopted in France in 1795, from the Latin 'centum' (hundred).

Current use: Extremely common in everyday measurement — centimeters for length and centiliters for small liquid volumes are used worldwide.

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.

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 Centi → Atto: multiply by 1E+16. For example, 1 c × 1E+16 = 1E+16 a.

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 c equals 1E+16 a. 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 Atto are in 1 Centi?

1 Centi (c) equals exactly 1E+16 Atto (a).

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 Centi to Other Prefixes

Possible Prefix Conversions

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