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

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