Femtoohm is 1e-15 ohm units.
Femtoohms to Ohms Converter — fOhm to Ohm
Convert Femtoohm (fOhm) to Ohm (Ohm) using the exact conversion factor (1 femtoohm = 1e-15 ohm). See the formula, worked examples, conversion table, history, and common uses.
Femtoohms to Ohms 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.
Ohm is the SI unit of electrical resistance.
Result = input x 1e-15 / 1.
Electrical units in the same family convert directly.
Reserved above the conversion cards and below the converter.
About Converting Femtoohms to Ohms
Femtoohm and Ohm 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: Femtoohm is 1e-15 ohm units, and ohm is the SI unit of electrical resistance.
Formula
ohms = femtoohms × 1e-15
This factor comes from each unit's defined relationship to the category's base unit: 1 femtoohm equals 1e-15 base units, and 1 ohm equals 1 base unit, so dividing one by the other gives the direct femtoohm-to-ohm factor of 1e-15.
Simple example
1 fOhm × 1e-15 = 1e-15 Ohm
1 femtoohm = 1e-15 ohms.
Real-world example
120 fOhm × 1e-15 = 1.2e-13 Ohm
120 femtoohms = 1.2e-13 ohms.
Conversion table
| Femtoohm (fOhm) | Ohm (Ohm) |
|---|---|
| 1 fOhm | 1e-15 Ohm |
| 5 fOhm | 5e-15 Ohm |
| 12 fOhm | 1.2e-14 Ohm |
| 24 fOhm | 2.4e-14 Ohm |
| 120 fOhm | 1.2e-13 Ohm |
| 240 fOhm | 2.4e-13 Ohm |
Reverse conversion: Ohm to Femtoohm
1e-15 Ohm × 1e+15 = 1 fOhm
1e-15 ohms = 1 femtoohm.
femtoohms = ohms × 1e+15
For a page dedicated to this direction, see Ohm to Femtoohm.
Understanding the Femtoohm (fOhm)
Femtoohm is 1e-15 ohm units.
Understanding the Ohm
Ohm (Ohm) measures electrical resistance. The SI derived unit of electrical resistance, equal to one volt per ampere. It is classified as a SI derived unit.
Where it's used: Universal — SI derived unit used worldwide
Uses of the Ohm today
- Resistor and circuit-component ratings
- Electrical wiring and grounding specifications
- Audio equipment impedance ratings
History of the Ohm
The ohm is named after Georg Simon Ohm (1789–1854), a German physicist who published Ohm's law in 1827, describing the relationship between voltage, current, and resistance (V = I × R) — the relationship the unit itself is defined through.
Historical origin. Ohm was not the invention of a single named person; it developed through the process described above.
Ohm — sources
- BIPM SI Brochure, 9th edition — Definition of the ohm as a coherent SI derived unit.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many ohms are in 1 femtoohm?
1 femtoohm equals 1e-15 ohms, using the exact defined conversion factor rather than an estimate.
How do I convert femtoohm to ohm?
Multiply the femtoohm value by 1e-15. The converter above does this instantly to whatever precision you set.
How do I convert ohm back to femtoohm?
Use the reverse factor: 1 ohm equals 1e+15 femtoohms. You can also use the swap control in the converter above to flip the direction instantly.
What is a femtoohm?
Femtoohm (fOhm) is a unit of electricity.
What is a ohm?
Ohm (Ohm) measures electrical resistance. The SI derived unit of electrical resistance, equal to one volt per ampere. It is classified as a SI derived unit.
Is the femtoohm to ohm conversion exact?
Yes. Both femtoohm and ohm are defined by fixed standards rather than physical artifacts, so the factor of 1e-15 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.