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Convert None (base unit) to Deka

None (base unit) (—) to Deka (da) 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 — = 0.1 da

1 None (base unit) = 0.1 Deka

1 Deka = 10 None (base unit)

1 — in every supported prefix

Conversion chart: None (base unit) to Deka

Conversion table

None (base unit) (—) Deka (da)
0.01 — 0.001 da
0.1 — 0.01 da
1 — 0.1 da
2 — 0.2 da
3 — 0.3 da
5 — 0.5 da
10 — 1 da
20 — 2 da
50 — 5 da
100 — 10 da
1000 — 100 da

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.

Deka (da)

Definition: An SI prefix denoting a factor of 10¹ — ten times the base unit. Sometimes spelled 'deca', from the Greek 'deka' (ten).

History: One of the original six metric prefixes adopted in France in 1795, though it has always been among the least-used of the classical set.

Current use: Rarely seen outside specialized contexts, though 'dekagram' remains in everyday grocery use in parts of Central Europe for measuring small food quantities.

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) → Deka: multiply by 0.1. For example, 1 — × 0.1 = 0.1 da.

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 0.1 da. 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 Deka are in 1 None (base unit)?

1 None (base unit) (—) equals exactly 0.1 Deka (da).

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

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

See also