The coulomb (C) is the SI unit of electric charge, equal to the charge carried by a steady current of one ampere flowing for one second.
Coulombs to Attocoulombs
Convert Coulomb (C) to Attocoulomb (aC) instantly with an exact formula, conversion table, and FAQ.
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Convert coulombs (C) to attocoulombs (aC) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
An Attocoulomb (aC) equals 1e-18 coulomb(s), a scaled unit of electric charge used for atto-scale electrical work.
aC = C × 1.000000e+18
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Formula
aC = C × 1.000000e+18
C = aC × 1.000000e-18
Conversion table
| 1 C | 1.000000e+18 aC |
| 5 C | 5.000000e+18 aC |
| 10 C | 1.000000e+19 aC |
| 20 C | 2.000000e+19 aC |
| 50 C | 5.000000e+19 aC |
| 100 C | 1.000000e+20 aC |
| 500 C | 5.000000e+20 aC |
| 1000 C | 1.000000e+21 aC |
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How the formula works
Both coulomb and attocoulomb measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in coulombs by 1.000000e+18 to get attocoulombs. To reverse the conversion, multiply a attocoulomb value by 1.000000e-18 to get back to coulombs.
Frequently asked questions
What is Coulomb (C)?
The coulomb (C) is the SI unit of electric charge, equal to the charge carried by a steady current of one ampere flowing for one second.
What is Attocoulomb (aC)?
An Attocoulomb (aC) equals 1e-18 coulomb(s), a scaled unit of electric charge used for atto-scale electrical work.
How do I convert coulombs to attocoulombs?
Multiply the coulomb value by 1.000000e+18 to get the equivalent in attocoulombs. For example, 5 C × 1.000000e+18 = 5.000000e+18 aC.
Is this conversion exact?
Yes. Both units use fixed, defined scale factors, so the factor 1.000000e+18 is an exact, non-rounded value.
Can I convert attocoulombs back to coulombs?
Yes. Divide the attocoulomb value by 1.000000e+18, or multiply it by 1.000000e-18, to get coulombs.
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About converting coulombs to attocoulombs
The coulomb (C) is the SI unit of electric charge, equal to the charge carried by a steady current of one ampere flowing for one second. An Attocoulomb (aC) equals 1e-18 coulomb(s), a scaled unit of electric charge used for atto-scale electrical work.
Use this calculator to move between coulombs and attocoulombs accurately for homework, engineering, billing, or everyday electricity calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.