Instant · Precise · Universal
32 units available
6 categories total
To convert Em to light-years: multiply by 105.7. To convert Em to parsecs: multiply by 32.4.
1 Em = 10¹⁸ m = 1,000 Pm ≈ 105.7 light-years ≈ 32.4 parsecs.
For example, 1 Exameter (Em) = 1.000000e+36 Attometer (am).
| Exameter (Em) | Attometer (am) |
|---|---|
| 0.1 | 1.000000e+35 |
| 0.5 | 5.000000e+35 |
| 1 | 1.000000e+36 |
| 2 | 2.000000e+36 |
| 5 | 5.000000e+36 |
| 10 | 1.000000e+37 |
| 25 | 2.500000e+37 |
| 50 | 5.000000e+37 |
| 100 | 1.000000e+38 |
| 500 | 5.000000e+38 |
| 1000 | 1.000000e+39 |
The exameter is a unit of length equal to 10¹⁸ meters, or about 105.7 light-years.
1 Em = 10¹⁸ m = 1,000 Pm ≈ 105.7 light-years ≈ 32.4 parsecs.
To convert Em to light-years: multiply by 105.7. To convert Em to parsecs: multiply by 32.4.
No practical applications. Theoretical framework for expressing galactic neighborhood distances.
The Milky Way galaxy has a diameter of about 10 Em (100,000 light-years).
Em is almost never used — astronomers use parsecs or light-years. It exists only for SI completeness.
Just remember: Exa = 10¹⁸. The Milky Way is about 10 Em across for a sense of scale.
The attometer is an extremely small unit of length equal to 10⁻¹⁸ meters, or one quintillionth of a meter.
1 am = 10⁻¹⁸ m = 10⁻⁹ nm = 0.001 fm. One meter contains 10¹⁸ attometers.
To convert am to meters: multiply by 10⁻¹⁸. To convert meters to am: multiply by 10¹⁸.
Measuring quark interaction distances and the scale of fundamental particle phenomena.
The effective size of a quark is estimated at less than 1 attometer — far smaller than a proton (~1,000 am across).
Confusing attometers with angstroms (Å = 10⁻¹⁰ m). Attometers are 100 million times smaller than an angstrom.
Think of the prefix chain: milli (10⁻³), micro (10⁻⁶), nano (10⁻⁹), pico (10⁻¹²), femto (10⁻¹⁵), atto (10⁻¹⁸).



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