Convert Petameter to Dekameter
Convert petameters to dekameters instantly. 1 petameter = 1e+14 dekameter — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Dekameter 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.
Dekameter
A dekameter (also spelled decameter) is a metric unit of length equal to ten meters (10 m). It is one of the less commonly used SI prefix units and primarily appears in agricultural, surveying, and atmospheric contexts.
The dekameter was defined alongside the meter when France adopted the metric system in 1795, using the standard SI prefix deca- (from Greek deka, ten) to denote a multiplication by ten.
Dekameters are used in some European agricultural contexts (parcel sizes, field measurements), atmospheric science (cloud heights), and certain track and field events. Modern usage is uncommon outside specialised technical fields.
Adopted in 1795 in France; ratified through the Metre Convention of 1875; remains a recognised SI prefix unit although informally superseded by the more common meter and hectometer in everyday surveying.
Petameter to Dekameter conversion formula
The relationship between petameters and dekameters:
To convert petameters to dekameters, multiply the value in petameters by 1e+14. To reverse, multiply dekameters by 1e-14.
How to use this converter
Type a value into the calculator. The result in dekameters updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Dekameter to Petameter converter for the reverse direction.
Step-by-step: convert petameters to dekameters
- Write down the value in petameters (Pm).
- Multiply that value by the factor 1e+14.
- The product is the equivalent value in dekameters (dam).
- To reverse, multiply the dekameter value by 1e-14.
Worked examples
Example 1 — Convert 1 Pm to dam:
1 × 1e+14 = 1e+14 dam
Example 2 — Convert 100 Pm to dam:
100 × 1e+14 = 1e+16 dam
Petameter to Dekameter conversion table
Standard reference values for converting petameters to dekameters:
| Petameter [Pm] | Dekameter [dam] |
|---|---|
| 0.01 | 1e+12 |
| 0.1 | 1e+13 |
| 1 | 1e+14 |
| 2 | 2e+14 |
| 3 | 3e+14 |
| 4 | 4e+14 |
| 5 | 5e+14 |
| 10 | 1e+15 |
| 20 | 2e+15 |
| 30 | 3e+15 |
| 40 | 4e+15 |
| 50 | 5e+15 |
| 100 | 1e+16 |
| 500 | 5e+16 |
| 1000 | 1e+17 |
Frequently asked questions
How many dekameters is 1 petameter?
How do I convert petameters to dekameters?
How do I convert dekameters back to petameters?
How many dekameters is 100 petameters?
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Sources & references
Conversion factor (1 Pm = 1e+14 dam) 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.