Convert Dekameter to Megameter
Convert dekameters to megameters instantly. 1 dekameter = 1e-5 megameter — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Megameter to Dekameter converter for the reverse conversion.
Units explained
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1795 in France; ratified through the Metre Convention of 1875; remains a recognised SI prefix unit although informally superseded by the more common meter and hectometer in everyday surveying.
Megameter
A megameter is a metric unit of length equal to one million meters (1×10⁶ m, or 1,000 km). It is occasionally used in geophysics and astronomy when expressing planetary-scale distances in SI units.
The megameter uses the SI prefix mega- (from Greek megas, great), adopted by the CGPM in 1960 to denote multiplication by one million.
Megameters appear in geophysics (Earth's mean radius is 6.371 Mm), planetary science, and large-scale civil engineering planning. The unit is less common than the kilometer for everyday geographic distances.
SI prefix mega- adopted in 1960; the megameter is the standard SI prefix unit for distances comparable to planetary radii.
Dekameter to Megameter conversion formula
The relationship between dekameters and megameters:
To convert dekameters to megameters, multiply the value in dekameters by 1e-5. To reverse, multiply megameters by 100000.
How to use this converter
Type a value into the calculator. The result in megameters updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Megameter to Dekameter converter for the reverse direction.
Step-by-step: convert dekameters to megameters
- Write down the value in dekameters (dam).
- Multiply that value by the factor 1e-5.
- The product is the equivalent value in megameters (Mm).
- To reverse, multiply the megameter value by 100000.
Worked examples
Example 1 — Convert 1 dam to Mm:
1 × 1e-5 = 1e-5 Mm
Example 2 — Convert 100 dam to Mm:
100 × 1e-5 = 0.001 Mm
Dekameter to Megameter conversion table
Standard reference values for converting dekameters to megameters:
| Dekameter [dam] | Megameter [Mm] |
|---|---|
| 0.01 | 1e-7 |
| 0.1 | 1e-6 |
| 1 | 1e-5 |
| 2 | 2e-5 |
| 3 | 3e-5 |
| 4 | 4e-5 |
| 5 | 5e-5 |
| 10 | 0.0001 |
| 20 | 0.0002 |
| 30 | 0.0003 |
| 40 | 0.0004 |
| 50 | 0.0005 |
| 100 | 0.001 |
| 500 | 0.005 |
| 1000 | 0.01 |
Frequently asked questions
How many megameters is 1 dekameter?
How do I convert dekameters to megameters?
How do I convert megameters back to dekameters?
How many megameters is 100 dekameters?
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Sources & references
Conversion factor (1 dam = 1e-5 Mm) 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.