mechanical horsepower to attowatt
Convert mechanical horsepower (hp) to attowatt (aW). Use an editable power converter, conversion formula, and reference table.
1 hp = 7.45699872e+20 aW
Conversion formula
One mechanical horsepower equals 7.45699872e+20 attowatt. Multiply your value in mechanical horsepower by this factor to get attowatt. For the reverse conversion, divide by the same factor.
Worked example
To convert 5 mechanical horsepower:5 × 7.45699872e+20 = 3.72849936e+21 aW
Conversion table
| mechanical horsepower (hp) | attowatt (aW) |
|---|---|
| 0.01 | 7.45699872e+18 |
| 0.1 | 7.45699872e+19 |
| 1 | 7.45699872e+20 |
| 2 | 1.49139974e+21 |
| 5 | 3.72849936e+21 |
| 10 | 7.45699872e+21 |
| 25 | 1.86424968e+22 |
| 50 | 3.72849936e+22 |
| 100 | 7.45699872e+22 |
| 1000 | 7.45699872e+23 |
About these measurements
Power is the rate of energy transfer.
The base reference used here is the watt. One mechanical horsepower is 745.6998716 base units; one attowatt is 1e-18 base units.
Important distinctions
Mechanical horsepower and metric horsepower are distinct units.
Precision
The converter uses stored conversion factors and floating-point arithmetic. Results display up to ten significant digits, switching to scientific notation for very small or large values. Keep the precision of your original measurement when reporting results.
Common questions
How do I convert hp to aW?
Multiply the quantity in hp by 7.45699872e+20. You can also type the value into the converter above.
Can I reverse the conversion?
Yes. Use the swap button or open the attowatt to mechanical horsepower converter.
Reference
NIST Guide to the SI — conversion factors and prefix conventions. SI prefixes scale units by powers of ten; the dimension-specific notes above describe the assumptions used on this page.
