Attowatt is 1e-18 watt units.
Attowatts to Yottawatts Converter — aW to YW
Convert Attowatt (aW) to Yottawatt (YW) using the exact conversion factor (1 attowatt = 1e-42 yottawatt). See the formula, worked examples, and conversion table.
Attowatts to Yottawatts converter
Converter
Power Converter
Convert watts, horsepower, refrigeration tons, BTU per hour, and engineering power units.
Context values
Some unit families need one extra value for a physically accurate result.
Yottawatt is 1e+24 watt units.
Result = input x 1e-18 / 1e+24.
Power uses the watt as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Attowatts to Yottawatts
Attowatt and Yottawatt both describe power output, and the conversion is a routine part of comparing an engine or motor's spec sheet across countries that use different power units. Specifically: Attowatt is 1e-18 watt units, and yottawatt is 1e+24 watt units.
Formula
yottawatts = attowatts × 1e-42
This factor comes from each unit's defined relationship to the category's base unit: 1 attowatt equals 1e-18 base units, and 1 yottawatt equals 1e+24 base units, so dividing one by the other gives the direct attowatt-to-yottawatt factor of 1e-42.
Simple example
1 aW × 1e-42 = 1e-42 YW
1 attowatt = 1e-42 yottawatts.
Real-world example
100 aW × 1e-42 = 1e-40 YW
100 attowatts = 1e-40 yottawatts.
Conversion table
| Attowatt (aW) | Yottawatt (YW) |
|---|---|
| 1 aW | 1e-42 YW |
| 10 aW | 1e-41 YW |
| 100 aW | 1e-40 YW |
| 500 aW | 5e-40 YW |
| 1,000 aW | 1e-39 YW |
| 5,000 aW | 5e-39 YW |
Reverse conversion: Yottawatt to Attowatt
1e-42 YW × 1e+42 = 1 aW
1e-42 yottawatts = 1 attowatt.
attowatts = yottawatts × 1e+42
For a page dedicated to this direction, see Yottawatt to Attowatt.
Understanding the Attowatt (aW)
Attowatt is 1e-18 watt units.
Understanding the Yottawatt (YW)
Yottawatt is 1e+24 watt units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many yottawatts are in 1 attowatt?
1 attowatt equals 1e-42 yottawatts, using the exact defined conversion factor rather than an estimate.
How do I convert attowatt to yottawatt?
Multiply the attowatt value by 1e-42. The converter above does this instantly to whatever precision you set.
How do I convert yottawatt back to attowatt?
Use the reverse factor: 1 yottawatt equals 1e+42 attowatts. You can also use the swap control in the converter above to flip the direction instantly.
What is a attowatt?
Attowatt (aW) is a unit of power.
What is a yottawatt?
Yottawatt (YW) is a unit of power.
Is the attowatt to yottawatt conversion exact?
Yes. Both attowatt and yottawatt are defined by fixed standards rather than physical artifacts, so the factor of 1e-42 used above is exact to as many digits as you choose to display.