Yoctohenry is 1e-24 henry units.
Yoctohenrys to Petahenrys Converter — yH to PH
Convert Yoctohenry (yH) to Petahenry (PH) using the exact conversion factor (1 yoctohenry = 1e-39 petahenry). See the formula, worked examples, and conversion table.
Yoctohenrys to Petahenrys converter
Converter
Electricity Converter
Convert electrical units by family and calculate voltage, current, resistance, power, and energy with context values.
Context values
Some unit families need one extra value for a physically accurate result.
Petahenry is 1000000000000000 henry units.
Result = input x 1e-24 / 1e+15.
Electrical units in the same family convert directly.
Reserved above the conversion cards and below the converter.
About Converting Yoctohenrys to Petahenrys
Yoctohenry and Petahenry both belong to the electricity family — voltage, current, resistance, power, or energy — units that show up constantly when working across the different standards used by household wiring (120V/240V depending on region), automotive electrical systems (12V/24V), and electronics design. Specifically: Yoctohenry is 1e-24 henry units, and petahenry is 1000000000000000 henry units.
Formula
petahenrys = yoctohenrys × 1e-39
This factor comes from each unit's defined relationship to the category's base unit: 1 yoctohenry equals 1e-24 base units, and 1 petahenry equals 1e+15 base units, so dividing one by the other gives the direct yoctohenry-to-petahenry factor of 1e-39.
Simple example
1 yH × 1e-39 = 1e-39 PH
1 yoctohenry = 1e-39 petahenrys.
Real-world example
120 yH × 1e-39 = 1.2e-37 PH
120 yoctohenrys = 1.2e-37 petahenrys.
Conversion table
| Yoctohenry (yH) | Petahenry (PH) |
|---|---|
| 1 yH | 1e-39 PH |
| 5 yH | 5e-39 PH |
| 12 yH | 1.2e-38 PH |
| 24 yH | 2.4e-38 PH |
| 120 yH | 1.2e-37 PH |
| 240 yH | 2.4e-37 PH |
Reverse conversion: Petahenry to Yoctohenry
1e-39 PH × 1e+39 = 1 yH
1e-39 petahenrys = 1 yoctohenry.
yoctohenrys = petahenrys × 1e+39
For a page dedicated to this direction, see Petahenry to Yoctohenry.
Understanding the Yoctohenry (yH)
Yoctohenry is 1e-24 henry units.
Understanding the Petahenry (PH)
Petahenry is 1000000000000000 henry units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many petahenrys are in 1 yoctohenry?
1 yoctohenry equals 1e-39 petahenrys, using the exact defined conversion factor rather than an estimate.
How do I convert yoctohenry to petahenry?
Multiply the yoctohenry value by 1e-39. The converter above does this instantly to whatever precision you set.
How do I convert petahenry back to yoctohenry?
Use the reverse factor: 1 petahenry equals 1e+39 yoctohenrys. You can also use the swap control in the converter above to flip the direction instantly.
What is a yoctohenry?
Yoctohenry (yH) is a unit of electricity.
What is a petahenry?
Petahenry (PH) is a unit of electricity.
Is the yoctohenry to petahenry conversion exact?
Yes. Both yoctohenry and petahenry are defined by fixed standards rather than physical artifacts, so the factor of 1e-39 used above is exact to as many digits as you choose to display.
What's the difference between voltage, current, and resistance?
Voltage (volts) is the electrical potential difference driving current through a circuit. Current (amperes) is the rate of flow of electric charge. Resistance (ohms) is how much a component opposes that flow. They're related by Ohm's law (V = I × R), but they are distinct physical quantities, and this page converts between units of just one of them.