Electricity Converters

Electricity Converters help you change one electrical unit into another, without guessing or doing manual math. This tool is useful for students, electricians, engineers, and anyone working with electrical circuits. You can convert common values like volts, amps, ohms, coulombs, and more.

How to Use

1Choose the type of conversion you need (current, voltage, etc.).
2Enter the value you already know (example: 120).
3Select the 'From' unit and the 'To' unit.
4View the converted result and copy it if needed.

What This Calculator Measures

Voltagevolts (V), millivolts (mV)

Currentamps (A), milliamps (mA)

Resistanceohms (Ω), kiloohms (kΩ)

Chargecoulombs (C), amp-hours (Ah)

Conductancesiemens (S), mho

Capacitancefarads (F), microfarads (µF)

Formula & Logic

Most conversions use simple scaling factors. For example, moving from base units like Volts to Millivolts involves multiplying by 1000.

Remember that Resistance (Ohms) and Conductance (Siemens) are inverses of each other.

Examples

120 V 120,000 mV
2.5 A 2500 mA
5000 C 1.39 Ah

Common Mistakes

Mixing up current (A) and charge (C)
Forgetting that milli = 1/1000
Using the wrong reference for conductance
Confusing mA with µA
Rounding too early

Engineering Note

When working with sensitive circuits, parasitic capacitance and inductance can affect performance at high frequencies — even when the calculated values look correct. Always verify converted values against your component datasheets and test under real operating conditions before finalising a design.

Real-World Applications by Category

Electric Charge

Coulombs, Amp-hours, Milliamp-hours

Battery capacity ratings for phones and EVs, capacitor sizing, electroplating calculations.

Electric Current

Amperes, Milliamperes, Microamperes

Circuit breaker sizing, fuse selection, LED driver current settings, Arduino/Raspberry Pi pin limits.

Electric Potential (Voltage)

Volts, Millivolts, Kilovolts

Comparing mains voltages across countries (120 V vs 230 V), sensor output signals, transformer design.

Electric Resistance

Ohms, Kilohms, Megaohms

Resistor selection in PCB design, cable impedance matching, insulation testing.

Capacitance

Farads, Microfarads, Picofarads

Filter design, timing circuits (RC networks), power factor correction, decoupling capacitors.

Inductance

Henries, Millihenries, Microhenries

Inductor selection for DC-DC converters, EMI filter design, inductive load calculations.

Electric Conductance

Siemens, Millisiemens

Determining how easily current flows in a conductor; the inverse of resistance used in admittance calculations.

Electric Field Strength

Volts per metre, Kilovolts per metre

Antenna design, dielectric breakdown thresholds, EMC (electromagnetic compatibility) testing.

Linear & Surface Charge Density

Coulombs per metre, C/m²

Electrostatics problems, capacitor plate modelling, semiconductor doping analysis.

Essential Electrical Formulas

Unit conversions are only part of the picture. These fundamental relationships connect the electrical quantities above and are essential in everyday circuit work:

V = I × R

Ohm's Law

Voltage equals current multiplied by resistance. The foundation of all DC circuit analysis.

P = V × I

Electric Power

Power (watts) equals voltage times current. Used to size wires, fuses, and power supplies.

Q = C × V

Capacitor Charge

Charge stored (coulombs) equals capacitance (farads) times voltage. Key for timing and filtering circuits.

V = L × (dI/dt)

Inductor Voltage

Voltage across an inductor equals inductance times the rate of current change. Critical for switching converters.

SI unit definitions per NIST SP 330; formulas are standard electrical engineering relationships.

Safety note: These converters are for reference and planning purposes only. For safety-critical applications — including mains wiring, industrial equipment, or high-voltage systems — always verify all values against your local electrical code and consult a qualified electrician or engineer before proceeding.

Frequently Asked Questions

They convert electrical units like watts, amps, volts, Wh, kWh, joules, and more, so you can compare values and make calculations faster.

Watts measure power right now. kWh measures energy used over time.

Divide watts by 1000. For example, 2000 W becomes 2 kW.

Multiply kWh by 1000. For example, 3.5 kWh becomes 3500 Wh.

Yes. If you enter volts and amps, the tool can compute watts using a basic power relationship.

Because kilowatts are larger units than watts. The value is the same amount of power, just expressed differently.

Most bills use kilowatt-hours (kWh) because it represents total energy consumed.

They measure energy, but they are different units. A converter helps you switch between them correctly.

VA stands for volt-amps, often used with AC systems. It relates to apparent power.

Sometimes, yes. AC may involve power factor and other details, while DC is usually more direct.

Accuracy depends on correct inputs and unit selection. For simple unit scaling (like W to kW), the conversion is exact.

Common ones are volts to watts, amps to watts, watts to kW, and Wh/kWh for estimating stored or used energy.

Electricity Converters

Charge

Linear Charge Density

Surface Charge Density

Volume Charge Density

Current

Linear Current Density

Surface Current Density

Electric Field Strength

Electric Potential

Electric Resistance

Electric Resistivity

Electric Conductance

Electric Conductivity

Electrostatic Capacitance

Inductance

Introduction

How to Use

What This Calculator Measures

Formula & Logic

Examples

Common Mistakes

Engineering Note

Real-World Applications by Category

Essential Electrical Formulas

Frequently Asked Questions

What are Electricity Converters used for?

What is the difference between watts and kWh?

How do I convert watts to kilowatts?

How do I convert kilowatt-hours to watt-hours?

Can I calculate watts from volts and amps with this tool?

Why does my number get smaller when converting to kW?

What unit do electricity bills use most often?

Is joule the same as watt-hour?

What does "VA" mean in electrical conversions?

Do I need different inputs for AC and DC calculations?

How accurate are the results?

Which converter should I use for solar or batteries?