Decibel-milliwatts (dBm) to Horsepower (hp) Conversion
Decibel-milliwatts
The decibel-milliwatt (dBm) is a unit of power expressed on a logarithmic scale relative to one milliwatt (1 mW). It is defined as dBm = 10 × log₁₀(P / 1 mW), where P is power in milliwatts. Used universally in RF engineering, telecommunications, and audio systems: Wi-Fi signal strength is expressed in dBm (typical values −30 to −90 dBm); a 0 dBm signal equals 1 mW; 30 dBm equals 1 W; −10 dBm equals 0.1 mW. Note: dBm cannot be converted with a simple multiplier — it requires the logarithmic formula.
Horsepower
Horsepower (hp) is a unit of power originally defined by James Watt in the 1780s to market steam engines against the work output of draft horses. The US mechanical horsepower equals exactly 745.69987158 watts. Multiple definitions exist: mechanical hp (745.7 W), metric hp (735.5 W), and electrical hp (746 W). In the automotive industry, engine power is expressed in horsepower in the US and UK markets, where 1 hp ≈ 0.7457 kW.
| Decibel-milliwatts (dBm) | Horsepower (hp) |
|---|---|
| 0.1 dBm | 0.00000137 hp |
| 1 dBm | 0.00000169 hp |
| 2 dBm | 0.00000213 hp |
| 3 dBm | 0.00000268 hp |
| 5 dBm | 0.00000424 hp |
| 10 dBm | 0.0000134 hp |
| 20 dBm | 0.000134 hp |
| 30 dBm | 0.00134 hp |
| 50 dBm | 0.1341 hp |
| 100 dBm | 13,410.2209 hp |
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How accurate are the conversion values?
All conversion factors are sourced from NIST (National Institute of Standards and Technology) and ISO 80000 international standards. They are exact where the standard defines them as exact.