An Attowatt (aW) equals 1e-18 watt(s), a scaled unit of electrical power used for atto-scale electrical work.
Attowatts to Watts
Convert Attowatt (aW) to Watt (W) instantly with an exact formula, conversion table, and FAQ.
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Convert attowatts (aW) to watts (W) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
The watt (W) is the SI unit of power, equal to one joule of energy transferred per second.
W = aW × 1.000000e-18
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Formula
W = aW × 1.000000e-18
aW = W × 1.000000e+18
Conversion table
| 1 aW | 1.000000e-18 W |
| 5 aW | 5.000000e-18 W |
| 10 aW | 1.000000e-17 W |
| 20 aW | 2.000000e-17 W |
| 50 aW | 5.000000e-17 W |
| 100 aW | 1.000000e-16 W |
| 500 aW | 5.000000e-16 W |
| 1000 aW | 1.000000e-15 W |
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How the formula works
Both attowatt and watt measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in attowatts by 1.000000e-18 to get watts. To reverse the conversion, multiply a watt value by 1.000000e+18 to get back to attowatts.
Frequently asked questions
What is Attowatt (aW)?
An Attowatt (aW) equals 1e-18 watt(s), a scaled unit of electrical power used for atto-scale electrical work.
What is Watt (W)?
The watt (W) is the SI unit of power, equal to one joule of energy transferred per second.
How do I convert attowatts to watts?
Multiply the attowatt value by 1.000000e-18 to get the equivalent in watts. For example, 5 aW × 1.000000e-18 = 5.000000e-18 W.
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 watts back to attowatts?
Yes. Divide the watt value by 1.000000e-18, or multiply it by 1.000000e+18, to get attowatts.
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About converting attowatts to watts
An Attowatt (aW) equals 1e-18 watt(s), a scaled unit of electrical power used for atto-scale electrical work. The watt (W) is the SI unit of power, equal to one joule of energy transferred per second.
Use this calculator to move between attowatts and watts accurately for homework, engineering, billing, or everyday electricity calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.