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Convert None (base unit) to Yocto

None (base unit) (—) to Yocto (y) 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 — = 1E+24 y

1 None (base unit) = 1E+24 Yocto

1 Yocto = 1E-24 None (base unit)

1 — in every supported prefix

Conversion chart: None (base unit) to Yocto

Conversion table

None (base unit) (—) Yocto (y)
0.01 — 1E+22 y
0.1 — 1E+23 y
1 — 1E+24 y
2 — 2E+24 y
3 — 3E+24 y
5 — 5E+24 y
10 — 1E+25 y
20 — 2E+25 y
50 — 5E+25 y
100 — 1E+26 y
1000 — 1E+27 y

None (base unit) (—)

Definition: The unprefixed base value — a multiplier of exactly 1, representing a quantity with no SI prefix attached at all (e.g. a plain gram, meter, or watt rather than a kilogram, kilometer, or milliwatt).

History: This isn't a historical unit in its own right — it's simply the reference point the entire SI prefix ladder is built around, against which every prefix above and below is defined as a power of ten.

Current use: Used as the baseline whenever a quantity is expressed without any prefix, and as the anchor point for converting any other prefix on this page to any other.

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.

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 None (base unit) → Yocto: multiply by 1E+24. For example, 1 — × 1E+24 = 1E+24 y.

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 — equals 1E+24 y. 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 Yocto are in 1 None (base unit)?

1 None (base unit) (—) equals exactly 1E+24 Yocto (y).

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 None (base unit) to Other Prefixes

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

Possible Prefix Conversions

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

See also