Convert Peta to Deka

Peta (P) 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.

Value

From

Result

1 P = 1E+14 da

1 Peta = 1E+14 Deka

1 Deka = 1E-14 Peta

1 P in every supported prefix

Conversion chart: Peta to Deka

Conversion table

Peta (P)	Deka (da)
0.01 P	1E+12 da
0.1 P	1E+13 da
1 P	1E+14 da
2 P	2E+14 da
3 P	3E+14 da
5 P	5E+14 da
10 P	1E+15 da
20 P	2E+15 da
50 P	5E+15 da
100 P	1E+16 da
1000 P	1E+17 da

Peta (P)

Definition: An SI prefix denoting a factor of 10¹⁵ — a quadrillion times the base unit.

History: Adopted by the CGPM in 1975 as part of the same extension that introduced exa-, tera having already proven insufficient for emerging large-scale scientific quantities.

Current use: Widely used in computing (petabytes of storage, petaflops of processing power) and in physics for large energy and frequency quantities.

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 Peta → Deka: multiply by 1E+14. For example, 1 P × 1E+14 = 1E+14 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 P equals 1E+14 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 Peta?

1 Peta (P) equals exactly 1E+14 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 Peta to Other Prefixes

Possible Prefix Conversions

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