Convert Petameter to Attometer
Convert petameters to attometers instantly. 1 petameter = 1e+33 attometer — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Attometer to Petameter converter for the reverse conversion.
Units explained
Petameter
A petameter is a metric unit of length equal to one quadrillion meters (1×10¹⁵ m). It is rarely used in everyday or scientific contexts; astronomers prefer the light-year or parsec for these scales.
The petameter uses the SI prefix peta- (from Greek penta, five, by analogy with the exponent's relation to thousand-cubed-cubed), adopted by the CGPM in 1975 to denote 10¹⁵.
Petameters could express interstellar-scale distances but are almost never used in practice. A light-year is approximately 9.46 Pm; astronomy uses light-years and parsecs as standard.
SI prefix peta- adopted in 1975; the petameter is rarely used because astronomy has well-established non-SI units (light-year, parsec) for this scale.
Attometer
An attometer is a metric unit of length equal to one quintillionth of a meter (1×10⁻¹⁸ m). It is among the smallest length units in the SI system and is used almost exclusively in particle physics and theoretical work involving sub-nuclear dimensions.
The attometer was defined using the SI prefix atto- (from Danish atten, meaning eighteen), adopted by the Conférence Générale des Poids et Mesures (CGPM) in 1964 to denote one quintillionth (10⁻¹⁸).
Attometers appear in particle physics literature when describing distances comparable to or smaller than nuclear dimensions, including the range of weak nuclear interactions and theoretical Planck-scale ratios. They are rarely encountered outside specialised scientific work.
SI prefix atto- adopted in 1964; the attometer became the standard unit for sub-femtometer measurements in high-energy physics from the late 20th century onward.
Petameter to Attometer conversion formula
The relationship between petameters and attometers:
To convert petameters to attometers, multiply the value in petameters by 1e+33. To reverse, multiply attometers by 1e-33.
How to use this converter
Type a value into the calculator. The result in attometers updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Attometer to Petameter converter for the reverse direction.
Step-by-step: convert petameters to attometers
- Write down the value in petameters (Pm).
- Multiply that value by the factor 1e+33.
- The product is the equivalent value in attometers (am).
- To reverse, multiply the attometer value by 1e-33.
Worked examples
Example 1 — Convert 1 Pm to am:
1 × 1e+33 = 1e+33 am
Example 2 — Convert 100 Pm to am:
100 × 1e+33 = 1e+35 am
Petameter to Attometer conversion table
Standard reference values for converting petameters to attometers:
| Petameter [Pm] | Attometer [am] |
|---|---|
| 0.01 | 1e+31 |
| 0.1 | 1e+32 |
| 1 | 1e+33 |
| 2 | 2e+33 |
| 3 | 3e+33 |
| 4 | 4e+33 |
| 5 | 5e+33 |
| 10 | 1e+34 |
| 20 | 2e+34 |
| 30 | 3e+34 |
| 40 | 4e+34 |
| 50 | 5e+34 |
| 100 | 1e+35 |
| 500 | 5e+35 |
| 1000 | 1e+36 |
Frequently asked questions
How many attometers is 1 petameter?
How do I convert petameters to attometers?
How do I convert attometers back to petameters?
How many attometers is 100 petameters?
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Sources & references
Conversion factor (1 Pm = 1e+33 am) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.