Convert Terameter to Attometer
Convert terameters to attometers instantly. 1 terameter = 1e+30 attometer — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Attometer to Terameter converter for the reverse conversion.
Units explained
Terameter
A terameter is a metric unit of length equal to one trillion meters (1×10¹² m). It is rare in everyday use but appears in astronomy when expressing solar-system-scale distances in SI units.
The terameter uses the SI prefix tera- (from Greek teras, monster), adopted by the CGPM in 1960 to denote multiplication by one trillion (10¹²).
Terameters are occasionally used in astronomy to express distances on the order of Earth–Sun (~0.15 Tm or 1 AU) and outer-planet distances. The astronomical unit (AU) and light-hour are more common in practice.
SI prefix tera- adopted in 1960; the terameter is the standard SI prefix unit for distances comparable to inter-planetary scales but is less common than the AU in working astronomy.
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.
Terameter to Attometer conversion formula
The relationship between terameters and attometers:
To convert terameters to attometers, multiply the value in terameters by 1e+30. To reverse, multiply attometers by 1e-30.
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 Terameter converter for the reverse direction.
Step-by-step: convert terameters to attometers
- Write down the value in terameters (Tm).
- Multiply that value by the factor 1e+30.
- The product is the equivalent value in attometers (am).
- To reverse, multiply the attometer value by 1e-30.
Worked examples
Example 1 — Convert 1 Tm to am:
1 × 1e+30 = 1e+30 am
Example 2 — Convert 100 Tm to am:
100 × 1e+30 = 1e+32 am
Terameter to Attometer conversion table
Standard reference values for converting terameters to attometers:
| Terameter [Tm] | Attometer [am] |
|---|---|
| 0.01 | 1e+28 |
| 0.1 | 1e+29 |
| 1 | 1e+30 |
| 2 | 2e+30 |
| 3 | 3e+30 |
| 4 | 4e+30 |
| 5 | 5e+30 |
| 10 | 1e+31 |
| 20 | 2e+31 |
| 30 | 3e+31 |
| 40 | 4e+31 |
| 50 | 5e+31 |
| 100 | 1e+32 |
| 500 | 5e+32 |
| 1000 | 1e+33 |
Frequently asked questions
How many attometers is 1 terameter?
How do I convert terameters to attometers?
How do I convert attometers back to terameters?
How many attometers is 100 terameters?
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Sources & references
Conversion factor (1 Tm = 1e+30 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.