An electrical unit converter converts between all common electrical units: current, voltage, resistance, power, capacitance, inductance, frequency, and charge. Select a category, enter a value, and see the result instantly.
All Conversions
Ohm's Law Reference
How to Use the Electrical Unit Converter
Select an electrical category using the tabs at the top (Current, Voltage, Resistance, etc.). Choose your source and target units from the dropdowns. Enter your value and the conversion appears instantly. The "All Conversions" section shows your value in all units for that category.
SI Prefix Scale
Most electrical conversions use SI prefixes: nano (n) = 10⁻⁹, micro (µ) = 10⁻⁶, milli (m) = 10⁻³, kilo (k) = 10³, mega (M) = 10⁶, giga (G) = 10⁹. So 1 mA = 0.001 A, 1 kV = 1,000 V, 1 pF = 0.000000000001 F.
Current Conversions
Current is measured in amperes (A). Typical electronics work in milliamperes (mA): LEDs use 10–20mA, Arduino pins source 40mA max, USB delivers 500mA (USB 2.0) to 3A+ (USB-C PD). Household circuits are 15A or 20A. Car starters draw 100–200A.
Capacitance Conversions
Capacitance units span a huge range. Ceramic decoupling capacitors are 100nF = 0.1µF = 100,000pF. Electrolytic filter capacitors are 100µF–10,000µF. Supercapacitors can be 1F–3,000F. The farad (F) itself is rarely used directly — most practical capacitors are µF, nF, or pF.
Power Conversions
Power in watts ranges from microwatts (µW) in RF circuits to megawatts (MW) in power plants. 1 horsepower = 745.7 watts. A 100W light bulb draws ~0.83A at 120V. A 1kW space heater draws ~8.33A at 120V. 1 BTU/hr = 0.293 W.
FAQ
How many milliamps are in 1 amp?
1 ampere (A) = 1,000 milliamperes (mA) = 1,000,000 microamperes (µA). USB 2.0 delivers 500mA (0.5A), USB 3.0 delivers 900mA (0.9A), and a fast charger can deliver 3A or more.
What is the difference between kV and V?
1 kilovolt (kV) = 1,000 volts (V). Household electricity is 120V (US) or 230V (EU). High-voltage transmission lines operate at 100kV–765kV. Lightning can reach 300,000kV (300MV).
How many ohms in a kilohm?
1 kilohm (kΩ) = 1,000 ohms (Ω). 1 megohm (MΩ) = 1,000,000 ohms. Common resistors range from a few ohms to several megohms. Insulation resistance is often measured in gigohms (GΩ).
What is a picofarad?
1 picofarad (pF) = 10⁻¹² farads (F). A microfarad (µF) = 10⁻⁶ F. Ceramic capacitors in electronics are commonly 10pF–100nF. Electrolytic capacitors are typically 1µF–10,000µF.
What is the difference between hertz and kilohertz?
1 kilohertz (kHz) = 1,000 Hz. 1 megahertz (MHz) = 1,000,000 Hz. 1 gigahertz (GHz) = 1,000,000,000 Hz. FM radio is 87.5–108 MHz. Wi-Fi operates at 2.4 GHz and 5 GHz.
How do I convert watts to kilowatts?
Divide by 1,000. 1 kilowatt (kW) = 1,000 watts (W). A household microwave uses about 1,000W (1kW). An electric car charger delivers 7.2–22kW. A power plant generates hundreds of megawatts (MW).
Is this electrical converter free?
Yes, completely free with no signup required. All conversions happen in your browser.